cassandra.yaml

# cassandra.yaml is the main storage configuration file for DataStax Enterprise (DSE).

# NOTE:
#   See the DataStax Enterprise documentation at https://docs.datastax.com/
# /NOTE

# The name of the cluster. This is mainly used to prevent machines in
# one logical cluster from joining another.
cluster_name: 'Test Cluster'

# The number of tokens randomly assigned to this node on the ring.
# The higher the token count is relative to other nodes, the larger the proportion of data
# that this node will store. You probably want all nodes to have the same number
# of tokens assuming they have equal hardware capability.
#
# If not set, the default value is 1 token for backward compatibility
# and will use the initial_token as described below.
#
# Specifying initial_token will override this setting on the node's initial start.
# On subsequent starts, this setting will apply even if initial token is set.
#
# If you already have a cluster with 1 token per node, and want to migrate to
# multiple tokens per node, see http://wiki.apache.org/cassandra/Operations
# num_tokens: 128

# Triggers automatic allocation of num_tokens tokens for this node. The allocation
# algorithm attempts to choose tokens in a way that optimizes replicated load over
# the nodes in the datacenter for the specified DC-level replication factor.
#
# The load assigned to each node will be close to proportional to its number of
# vnodes.
#
# Supported only with the Murmur3Partitioner.
# allocate_tokens_for_local_replication_factor: 3

# initial_token allows you to specify tokens manually.  To use with
# vnodes (num_tokens > 1, above), provide a
# comma-separated list of tokens. This option is primarily used when adding nodes to legacy clusters
# that do not have vnodes enabled.
# initial_token:

# See http://wiki.apache.org/cassandra/HintedHandoff
# True to enable globally, false to disable globally.
hinted_handoff_enabled: true

# When hinted_handoff_enabled is true, a black list of data centers that will not
# perform hinted handoff. Other datacenters not listed will perform hinted handoffs.
# hinted_handoff_disabled_datacenters:
#    - DC1
#    - DC2

# Maximum amount of time during which the database generates hints for an unresponsive node.
# After this interval, the database does not generate any new hints for the node until it is
# back up and responsive.  If the node goes down again, the database starts a new interval. This setting
# can prevent a sudden demand for resources when a node is brought back online and the rest of the
# cluster attempts to replay a large volume of hinted writes.
max_hint_window_in_ms: 10800000 # 3 hours

# Maximum throttle in KBs per second per delivery thread.  This will be
# reduced proportionally to the number of nodes in the cluster.  If there
# are two nodes in the cluster, each delivery thread will use the maximum
# rate; if there are three, each will throttle to half of the maximum,
# since we expect two nodes to be delivering hints simultaneously.
hinted_handoff_throttle_in_kb: 1024

# Number of threads with which to deliver hints;
# Consider increasing this number when you have multi-dc deployments, since
# cross-dc handoff tends to be slower
max_hints_delivery_threads: 2

# Directory to store hints.
# If not set, the default directory is $DSE_HOME/data/hints.
hints_directory: /var/lib/cassandra/hints

# How often to flush hints from the internal buffers to disk.
# Will *not* trigger fsync.
hints_flush_period_in_ms: 10000

# Maximum size, in MB, for a single hints file.
max_hints_file_size_in_mb: 128

# Compression to apply to the hint files. If omitted, hints files
# will be written uncompressed. LZ4, Snappy, and Deflate compressors
# are supported.
#hints_compression:
#   - class_name: LZ4Compressor
#     parameters:
#         -

# Maximum throttle in KBs per second, total. This will be
# reduced proportionally to the number of nodes in the cluster.
batchlog_replay_throttle_in_kb: 1024

# Strategy to choose the batchlog storage endpoints.
#
# Available options:
#
# - random_remote
#   Default, purely random. Prevents the local rack, if possible. Same behavior as earlier releases.
#
# - dynamic_remote
#   Uses DynamicEndpointSnitch to select batchlog storage endpoints. Prevents the
#   local rack, if possible. This strategy offers the same availability guarantees
#   as random_remote, but selects the fastest endpoints according to the DynamicEndpointSnitch.
#   (DynamicEndpointSnitch tracks reads but not writes. Write-only,
#   or mostly-write, workloads might not benefit from this strategy.
#   Note: this strategy will fall back to random_remote if dynamic_snitch is not enabled.
#
# - dynamic
#   Mostly the same as dynamic_remote, except that local rack is not excluded, which offers lower
#   availability guarantee than random_remote or dynamic_remote.
#   Note: this strategy will fall back to random_remote if dynamic_snitch is not enabled.
#
# batchlog_endpoint_strategy: random_remote

# DataStax Enterprise (DSE) provides the DseAuthenticator for external authentication
# with multiple authentication schemes such as Kerberos, LDAP, and internal authentication.
# Additional configuration is required in dse.yaml for enabling authentication.
# If using DseAuthenticator, DseRoleManager must also be used (see below).
#
# All other authenticators, including org.apache.cassandra.auth.{AllowAllAuthenticator,
# PasswordAuthenticator} are deprecated, and some security features may not work
# correctly if they are used.
authenticator: com.datastax.bdp.cassandra.auth.DseAuthenticator

# DataStax Enterprise (DSE) provides the DseAuthorizer which must be used in place
# of the CassandraAuthorizer if the DseAuthenticator is being used. It allows
# enhanced permission management of DSE specific resources.
# Additional configuration is required in dse.yaml for enabling authorization.
#
# All other authorizers, including org.apache.cassandra.auth.{AllowAllAuthorizer,
# CassandraAuthorizer} are deprecated, and some security features may not work
# correctly if they are used.
authorizer: com.datastax.bdp.cassandra.auth.DseAuthorizer

# DataStax Enterprise (DSE) provides the DseRoleManager that supports LDAP roles
# as well as the internal roles supported by CassandraRoleManager. The DseRoleManager
# stores role options in the dse_security keyspace.
# Please increase the dse_security keyspace replication factor when using this role
# manager. Additional configuration is required in dse.yaml.
#
# All other role managers, including CassandraRoleManager are deprecated, and some
# security features might not work correctly if they are used.
role_manager: com.datastax.bdp.cassandra.auth.DseRoleManager

# Whether to enable system keyspace filtering so that users can access and view
# only schema information for rows in the system and system_schema keyspaces to
# which they have access. Security requirements and user permissions apply.
# Enable this feature only after appropriate user permissions are granted.
#
# See Managing keyspace and table permissions at
# https://docs.datastax.com/en/dse/6.7/dse-admin/datastax_enterprise/security/secSystemKeyspaces.html
#
# Default: false
system_keyspaces_filtering: false

# Validity period for roles cache (fetching granted roles can be an expensive
# operation depending on the role manager)
# Granted roles are cached for authenticated sessions in AuthenticatedUser and
# after the period specified here, become eligible for (async) reload.
# Defaults to 120000, set to 0 to disable caching entirely.
# Will be disabled automatically if internal authentication is disabled
# when using DseAuthenticator.
roles_validity_in_ms: 120000

# Refresh interval for roles cache (if enabled).
# After this interval, cache entries become eligible for refresh. On next
# access, an async reload is scheduled and returns the old value until the reload
# completes. If roles_validity_in_ms is non-zero, then this value must be non-zero
# also.
# Defaults to the same value as roles_validity_in_ms.
# roles_update_interval_in_ms: 2000

# Validity period for permissions cache (fetching permissions can be an
# expensive operation depending on the authorizer).
# Defaults to 120000, set to 0 to disable.
# Will be disabled automatically if authorization is disabled when
# using DseAuthorizer.
permissions_validity_in_ms: 120000

# Refresh interval for permissions cache (if enabled).
# After this interval, cache entries become eligible for refresh. Upon next
# access, an async reload is scheduled and the old value returned until it
# completes. If permissions_validity_in_ms is non-zero, then this value must also be
# non-zero.
# Defaults to the same value as permissions_validity_in_ms.
# permissions_update_interval_in_ms: 2000

# The partitioner is responsible for distributing groups of rows (by
# partition key) across nodes in the cluster.  You should leave this
# alone for new clusters.  The partitioner can NOT be changed without
# reloading all data, so when upgrading you should set this to the
# same partitioner you were already using.
#
# Besides Murmur3Partitioner, partitioners included for backwards
# compatibility include RandomPartitioner, ByteOrderedPartitioner, and
# OrderPreservingPartitioner.
#
partitioner: org.apache.cassandra.dht.Murmur3Partitioner

# Directories where the database should store data on disk. The data
# is spread evenly across the directories, subject to the granularity of
# the configured compaction strategy.
# If not set, the default directory is $DSE_HOME/data/data.
data_file_directories:
     - /var/lib/cassandra/data

# Metadata directory that holds information about the cluster, local node and its peers.
# Currently, only a single subdirectory called 'nodes' will be used.
# If not set, the default directory is $CASSANDRA_HOME/data/metadata.
metadata_directory: /var/lib/cassandra/metadata

# Commit log directory. When running on magnetic HDD, this directory should be on a
# separate spindle than the data directories.
# If not set, the default directory is $DSE_HOME/data/commitlog.
commitlog_directory: /var/lib/cassandra/commitlog

# Whether to enable CDC functionality on a per-node basis. CDC functionality modifies the logic used
# for write path allocation rejection. When false (standard behavior), never reject. When true (use cdc functionality),
# reject mutation that contains a CDC-enabled table if at space limit threshold in cdc_raw_directory.
cdc_enabled: true

# CommitLogSegments are moved to this directory on flush if cdc_enabled: true and the
# segment contains mutations for a CDC-enabled table. This directory should be placed on a
# separate spindle than the data directories. If not set, the default directory is
# $DSE_HOME/data/cdc_raw.
cdc_raw_directory: /var/lib/cassandra/cdc_raw

# Policy for data disk failures:
#
# die
#   shut down gossip and client transports and kill the JVM for any fs errors or
#   single-sstable errors, so the node can be replaced.
#
# stop_paranoid
#   shut down gossip and client transports even for single-sstable errors,
#   kill the JVM for errors during startup.
#
# stop
#   shut down gossip and client transports, leaving the node effectively dead, but
#   can still be inspected via JMX, kill the JVM for errors during startup.
#
# best_effort
#    stop using the failed disk and respond to requests based on
#    remaining available sstables.  This means you WILL see obsolete
#    data at CL.ONE!
#
# ignore
#    ignore fatal errors and let requests fail, as in pre-1.2 Cassandra
disk_failure_policy: stop

# Policy for commit disk failures:
#
# die
#   shut down the node and kill the JVM, so the node can be replaced.
#
# stop
#   shut down the node, leaving the node effectively dead, node
#   can still be inspected via JMX.
#
# stop_commit
#   shutdown the commit log, letting writes collect but
#   continuing to service reads, as in pre-2.0.5 Cassandra
#
# ignore
#   ignore fatal errors and let the batches fail
commit_failure_policy: stop

# Maximum size of the native protocol prepared statement cache.
#
# Note that specifying a too large value will result in long running GCs and possbily
# out-of-memory errors. Keep the value at a small fraction of the heap.
#
# If you constantly see "prepared statements discarded in the last minute because
# cache limit reached" messages, the first step is to investigate the root cause
# of these messages and check whether prepared statements are used correctly -
# i.e. use bind markers for variable parts.
#
# Change the default value only if there are more prepared statements than
# fit in the cache. In most cases, it is not neccessary to change this value.
# Constantly re-preparing statements is a performance penalty.
#
# Valid value is a number greater than 0. When not set, the default is calculated.
#
# The default calculated value is 1/256th of the heap or 10 MB, whichever is greater.
prepared_statements_cache_size_mb:

# Row cache implementation class name. Available implementations:
#
# org.apache.cassandra.cache.OHCProvider
#   Fully off-heap row cache implementation (default).
#
# org.apache.cassandra.cache.SerializingCacheProvider
#   This is the row cache implementation availabile
#   in previous releases of Cassandra.
# row_cache_class_name: org.apache.cassandra.cache.OHCProvider

# Maximum size of the row cache in memory.
# OHC cache implementation requires additional off-heap memory to manage
# the map structures and additional in-flight memory during operations before/after cache entries can be
# accounted against the cache capacity. This overhead is usually small compared to the whole capacity.
# Do not specify more memory that the system can afford in the worst usual situation and leave some
# headroom for OS block level cache. Never allow your system to swap.
#
# Default value is 0 to disable row caching.
row_cache_size_in_mb: 0

# Duration in seconds after which the database should save the row cache.
# Caches are saved to saved_caches_directory as specified in this configuration file.
#
# Saved caches greatly improve cold-start speeds, and is relatively cheap in
# terms of I/O for the key cache. Row cache saving is much more expensive and
# has limited use.
#
# Default is 0 to disable saving the row cache.
row_cache_save_period: 0

# Number of keys from the row cache to save.
# Specify 0 (which is the default), meaning all keys are going to be saved
# row_cache_keys_to_save: 100

# Maximum size of the counter cache in memory.
#
# Counter cache helps to reduce counter locks' contention for hot counter cells.
# In case of RF = 1 a counter cache hit will cause the database to skip the read before
# write entirely. With RF > 1 a counter cache hit will still help to reduce the duration
# of the lock hold, helping with hot counter cell updates, but will not allow skipping
# the read entirely. Only the local (clock, count) tuple of a counter cell is kept
# in memory, not the whole counter, so it's relatively cheap.
#
# NOTE: if you reduce the size, you might not get the hottest keys loaded on startup.
#
# When not set, the default value is calculated (min(2.5% of Heap (in MB), 50MB)).
# Set to 0 to disable counter cache.
# NOTE: if you perform counter deletes and rely on low gcgs, you should disable the counter cache.
counter_cache_size_in_mb:

# Duration in seconds after which the database should
# save the counter cache (keys only). Caches are saved to saved_caches_directory as
# specified in this configuration file.
#
# Default is 7200 (2 hours).
counter_cache_save_period: 7200

# Number of keys from the counter cache to save.
# Disabled by default. When commented out (disabled), all keys are saved.
# counter_cache_keys_to_save: 100

# Saved caches directory.
# If not set, the default directory is $DSE_HOME/data/saved_caches.
saved_caches_directory: /var/lib/cassandra/saved_caches

# commitlog_sync
# Valid commitlog_sync values are periodic, group, or batch.
#
# When in batch mode, the database won't ack writes until the commit log
# has been flushed to disk.  Each incoming write will trigger the flush task.
# commitlog_sync_batch_window_in_ms is a deprecated value. Previously it had
# almost no value, and is being removed.
#
# commitlog_sync_batch_window_in_ms: 2
#
# group mode is similar to batch mode, where the database will not ack writes
# until the commit log has been flushed to disk. The difference is group
# mode will wait up to commitlog_sync_group_window_in_ms between flushes.
#
# commitlog_sync_group_window_in_ms: 1000
#
# The default is periodic. When in periodic mode, writes can be acked immediately
# and the CommitLog is simply synced every commitlog_sync_period_in_ms.
commitlog_sync: periodic
commitlog_sync_period_in_ms: 500

# The size of the individual commitlog file segments.  A commitlog
# segment can be archived, deleted, or recycled after all the data
# in it (potentially from each table in the system) has been
# flushed to sstables.
#
# The default size is 32, which is almost always fine, but if you are
# archiving commitlog segments (see commitlog_archiving.properties),
# then you probably want a finer granularity of archiving; 8 or 16 MB
# is reasonable.
# Max mutation size is also configurable via max_mutation_size_in_kb setting in
# cassandra.yaml. When max_mutation_size_in_kb is not set, the calculated default is half the size
# commitlog_segment_size_in_mb * 1024. This value should be positive and less than 2048.
#
# NOTE: If max_mutation_size_in_kb is set explicitly, then commitlog_segment_size_in_mb must
# be set to at least twice the size of max_mutation_size_in_kb / 1024
#
commitlog_segment_size_in_mb: 32

# Compression to apply to the commit log.
# When not set, the default compression for the commit log is uncompressed.
# LZ4, Snappy, and Deflate compressors are supported.
# commitlog_compression:
#   - class_name: LZ4Compressor
#     parameters:
#         -

# Any class that implements the SeedProvider interface and has a
# constructor that takes a Map<String, String> of parameters is valid.
seed_provider:
    # Addresses of hosts that are deemed contact points.
    # Database nodes use this list of hosts to find each other and learn
    # the topology of the ring. You _must_ change this if you are running
    # multiple nodes!
    - class_name: org.apache.cassandra.locator.SimpleSeedProvider
      parameters:
          # seeds is actually a comma-delimited list of addresses.
          # Ex: "<ip1>,<ip2>,<ip3>"
          - seeds: "127.0.0.1"

# Maximum memory used for file buffers that are stored in the file cache, also
# known as the chunk cache. This is used as a cache that holds uncompressed
# sstable chunks, potentially for a very long time (until the sstable is obsoleted
# by compaction or until the data is evicted by the cache).
# When not set, the default is calculated as 1/4  of (system RAM - max heap).
# This pool is allocated off-heap but the chunk cache also has on-heap overhead
# which is roughly 120 bytes per entry.
# Memory is allocated only when needed but is not released.
# file_cache_size_in_mb: 4096

# In addition to buffers stored in the file cache, buffers are also used for transient
# operations such as reading sstables (when the data to be read is larger than the file cache buffer size),
# reading hints or CRC files. Buffers used for such operations are kept in memory
# in order to avoid continuous allocations, up to this limit.
# A buffer is typically used by a read operation and then returned to this pool when the operation is finished
# so that it can be reused by other operations.
# When not set the default is 2M per core plus 2M for all other threads capped at 128 MiB.
# Memory is allocated only when needed but is not released.
# direct_reads_size_in_mb: 128


# The strategy for optimizing disk read.
# Possible values are:
# ssd (for solid state disks, the default). When not set, the default is ssd.
# spinning (for spinning disks)
# disk_optimization_strategy: ssd

# Total permitted memory to use for memtables. The database will stop
# accepting writes when the limit is exceeded until a flush completes,
# and will trigger a flush based on memtable_cleanup_threshold
# If omitted, the calculated value is 1/4 the size of the heap.
# memtable_space_in_mb: 2048


# Ratio of occupied non-flushing memtable size to total permitted size
# that will trigger a flush of the largest memtable. Larger mct will
# mean larger flushes and hence less compaction, but also less concurrent
# flush activity which can make it difficult to keep your disks fed
# under heavy write load.
#
# memtable_cleanup_threshold defaults to max(0.15, 1 / (memtable_flush_writers + 1))
# memtable_cleanup_threshold: 0.15

# Specify the way the database allocates and manages memtable memory.
# Options are:
#
# heap_buffers
#   on heap nio buffers
#
# offheap_buffers
#   off heap (direct) nio buffers
#
# offheap_objects
#    off heap objects
memtable_allocation_type: offheap_objects

# Disk usage threshold that will trigger the database to reclaim some space
# used by the commit log files.
#
# If the commit log disk usage exceeds this threshold, the database will flush
# every dirty table in the oldest segment and remove it. So a small total
# commitlog space will cause more flush activity on less-active
# tables.
#
# The default value is the smaller of 8192, and 1/4 of the total space
# of the commitlog volume.
#
# The database will still write commit logs while it reclaims space
# from previous commit logs. Therefore, the total disk space "reserved"
# for the commit log should be _at least_ 25% bigger than the value of the
# commitlog_total_space_in_mb configuration parameter. The actual
# value depends on the write workload.
#
# commitlog_total_space_in_mb: 8192

# The number of memtable flush writer threads per disk and
# the total number of memtables that can be flushed concurrently.
# These are generally a combination of compute and IO bound.
#
# Memtable flushing is more CPU efficient than memtable ingest and a single thread
# can keep up with the ingest rate of a whole server on a single fast disk
# until it temporarily becomes IO bound under contention typically with compaction.
# At that point you need multiple flush threads. At some point in the future
# it may become CPU bound all the time.
#
# You can tell if flushing is falling behind using the MemtablePool.BlockedOnAllocation
# metric, which should be 0. A non-zero metric occurs if threads are blocked waiting on flushing
# to free memory.
#
# memtable_flush_writers defaults to 8, and this means 8 Memtables can be flushed concurrently
# to a single data directory.
#
# There is a direct tradeoff between number of memtables that can be flushed concurrently
# and flush size and frequency. More is not better you just need enough flush writers
# to never stall waiting for flushing to free memory.
#
# memtable_flush_writers: 8

# Total space to use for change-data-capture logs on disk.
#
# If space gets above this value, the database will throw WriteTimeoutException
# on mutations including CDC-enabled tables. A CDCCompactor is responsible
# for parsing the raw CDC logs and deleting them when parsing is completed.
#
# The default value is calculated as the min of 4096 mb and 1/8th of the total space
# of the drive where cdc_raw_directory resides.
# cdc_total_space_in_mb: 4096

# When the cdc_raw limit is reached and the CDCCompactor is running behind
# or experiencing backpressure, we check at the following interval to see if any
# new space for cdc-tracked tables has been made available. Default to 250ms
# cdc_free_space_check_interval_ms: 250

# Whether to enable periodic fsync() when doing sequential writing. When enabled, fsync() at intervals
# force the operating system to flush the dirty
# buffers. Enable to avoid sudden dirty buffer flushing from
# impacting read latencies. Almost always a good idea on SSDs; not
# necessarily on platters.
trickle_fsync: true
trickle_fsync_interval_in_kb: 10240

# TCP port, for commands and data.
# For security reasons, you should not expose this port to the internet.  Firewall it if needed.
storage_port: 7000

# SSL port, for encrypted communication.  Unused unless enabled in
# encryption_options
# For security reasons, you should not expose this port to the internet.  Firewall it if needed.
ssl_storage_port: 7001

# Address or interface to bind to and tell other nodes to connect to.
# You _must_ change this address or interface to enable multiple nodes to communicate!
#
# Set listen_address OR listen_interface, not both.
#
# When not set (blank), InetAddress.getLocalHost() is used. This
# will always do the Right Thing _if_ the node is properly configured
# (hostname, name resolution, etc), and the Right Thing is to use the
# address associated with the hostname (it might not be).
#
# Setting listen_address to 0.0.0.0 is always wrong.
#
listen_address: localhost

# Set listen_address OR listen_interface, not both. Interfaces must correspond
# to a single address. IP aliasing is not supported.
#listen_interface: wlan0

# If you specify the interface by name and the interface has an ipv4 and an ipv6 address,
# specify which address.
# If false, the first ipv4 address will be used.
# If true, the first ipv6 address will be used.
# When not set, the default is false (ipv4).
# If there is only one address, that address is selected regardless of ipv4/ipv6.
# listen_interface_prefer_ipv6: false

# Address to broadcast to other database nodes.
# Leaving this blank will set it to the same value as listen_address
# broadcast_address: 1.2.3.4

# When using multiple physical network interfaces, set this
# to true to listen on broadcast_address in addition to
# the listen_address, allowing nodes to communicate in both
# interfaces.
# Do not set this property if the network configuration automatically
# routes between the public and private networks such as EC2.
# listen_on_broadcast_address: false

# Internode authentication backend, implementing IInternodeAuthenticator;
# used to allow/disallow connections from peer nodes.
# internode_authenticator: org.apache.cassandra.auth.AllowAllInternodeAuthenticator

# Whether to start the native transport server.
# The address on which the native transport is bound is defined by native_transport_address.
start_native_transport: true
# The port where the CQL native transport listens for clients.
# For security reasons, do not expose this port to the internet. Firewall it if needed.
native_transport_port: 9042
# Enabling native transport encryption in client_encryption_options allows you to use
# encryption for the standard port or use a dedicated, additional port along with the unencrypted
# standard native_transport_port.
# If client encryption is enabled and native_transport_port_ssl is disabled, the
# native_transport_port (default: 9042) will encrypt all traffic. To use both unencrypted and encrypted
# traffic, enable native_transport_port_ssl.
# native_transport_port_ssl: 9142
#
# The maximum size of allowed frame. Frame (requests) larger than this will
# be rejected as invalid. The default is 256 MB. If you're changing this parameter,
# you may want to adjust max_value_size_in_mb accordingly. This should be positive and less than 2048.
# native_transport_max_frame_size_in_mb: 256

# The maximum number of concurrent client connections.
# The default is -1, which means unlimited.
# native_transport_max_concurrent_connections: -1

# The maximum number of concurrent client connections per source ip.
# The default is -1, which means unlimited.
# native_transport_max_concurrent_connections_per_ip: -1

# Controls whether Cassandra honors older protocol versions
# The default is true, which means older protocols will be honored.
native_transport_allow_older_protocols: true

# The address or interface to bind the native transport server to.
#
# Set native_transport_address OR native_transport_interface, not both.
#
# Leaving native_transport_address blank has the same effect as on listen_address
# (i.e. it will be based on the configured hostname of the node).
#
# Note that unlike listen_address, you can specify 0.0.0.0, but you must also
# set native_transport_broadcast_address to a value other than 0.0.0.0.
#
# For security reasons, you should not expose this port to the internet.  Firewall it if needed.
native_transport_address: localhost

# Set native_transport_address OR native_transport_interface, not both. Interfaces must correspond
# to a single address, IP aliasing is not supported.
# native_transport_interface: eth0

# If you specify the interface by name and the interface has an ipv4 and an ipv6 address,
# specify which address.
# If false, the first ipv4 address will be used.
# If true, the first ipv6 address will be used.
# When not set, the default is false (ipv4).
# If there is only one address, that address is selected regardless of ipv4/ipv6.
# native_transport_interface_prefer_ipv6: false

# Native transport address to broadcast to drivers and other nodes.
# Do not set to 0.0.0.0. If left blank, this will be set to the value of
# native_transport_address. If native_transport_address is set to 0.0.0.0, native_transport_broadcast_address must
# be set.
# native_transport_broadcast_address: 1.2.3.4

# enable or disable keepalive on native connections
native_transport_keepalive: true

# Uncomment to set socket buffer size for internode communication.
# Note that when setting this, the buffer size is limited by net.core.wmem_max
# and when not setting it, the buffer size is defined by net.ipv4.tcp_wmem
# See also:
# /proc/sys/net/core/wmem_max
# /proc/sys/net/core/rmem_max
# /proc/sys/net/ipv4/tcp_wmem
# /proc/sys/net/ipv4/tcp_wmem
# and 'man tcp'
# internode_send_buff_size_in_bytes:

# Uncomment to set socket buffer size for internode communication.
# Note that when setting this value, the buffer size is limited by net.core.wmem_max
# and when not setting this value, the buffer size is defined by net.ipv4.tcp_wmem
# internode_recv_buff_size_in_bytes:

# Whether to create a hard link to each SSTable
# flushed or streamed locally in a backups/ subdirectory of the
# keyspace data. Incremental backups enable storing backups off site without transferring entire
# snapshots. The database does not automatically clear incremental backup files.
# DataStax recommends setting up a process to clear incremental backup hard links each time a new snapshot is created.
incremental_backups: false

# Whether to enable snapshots before each compaction.
# Be careful using this option, since the database won't clean up the
# snapshots for you. A snapshot is useful to back up data when there is a data format change.
snapshot_before_compaction: false

# Whether to enable snapshots of the data before truncating a keyspace or
# dropping a table. To prevent data loss, DataStax strongly advises using the default
# setting. If you set auto_snapshot to false, you lose data on truncation or drop.
auto_snapshot: true

# Granularity of the collation index of rows within a partition.
# Smaller granularity means better search times, especially if
# the partition is in disk cache, but also higher size of the
# row index and the associated memory cost for keeping that cached.
# The performance of lower density nodes may benefit from decreasing
# this number to 4, 2 or 1kb.
column_index_size_in_kb: 16

# Threshold for the total size of all index entries for a partition that the database
# stores in the partition key cache. If the total size of all index entries for a partition
# exceeds this amount, the database stops putting entries for this partition into the partition
# key cache.
#
# Note that this size refers to the size of the
# serialized index information and not the size of the partition.
column_index_cache_size_in_kb: 2

# Number of simultaneous compactions allowed to run simultaneously, NOT including
# validation "compactions" for anti-entropy repair.  Simultaneous
# compactions help preserve read performance in a mixed read/write
# workload by limiting the number of small SSTables that accumulate
# during a single long running compaction. When not set, the calculated default is usually
# fine. If you experience problems with compaction running too
# slowly or too fast, you should first review the
# compaction_throughput_mb_per_sec option.
#
# The calculated default value for concurrent_compactors defaults to the smaller of (number of disks,
# number of cores), with a minimum of 2 and a maximum of 8.
#
# If your data directories are backed by SSD, increase this
# to the number of cores.
#concurrent_compactors: 1

# Number of simultaneous repair validations to allow. Default is unbounded
# Values less than one are interpreted as unbounded (the default)
# concurrent_validations: 0

# Number of simultaneous materialized view builder tasks to allow.
concurrent_materialized_view_builders: 2

# Number of permitted concurrent lightweight transactions.
# A higher number might improve throughput if non-contending LWTs are in heavy use,
# but will use more memory and may fare worse with contention.
#
# The default value (equal to eight times the number of TPC cores) should be
# good enough for most cases.
# concurrent_lw_transactions: 128

# Maximum number of LWTs that can be queued up before the node starts reporting
# OverloadedException for LWTs.
# max_pending_lw_transactions: 10000

# Throttles compaction to the specified total throughput across the entire
# system. The faster you insert data, the faster you need to compact in
# order to keep the SSTable count down. In general, setting this to
# 16 to 32 times the rate you are inserting data is more than sufficient.
# Set to 0 to disable throttling. Note that this throughput applies for all types
# of compaction, including validation compaction.
compaction_throughput_mb_per_sec: 16

# The size of the SSTables to trigger preemptive opens. The compaction process opens
# SSTables before they are completely written and uses them in place
# of the prior SSTables for any range previously written. This process helps
# to smoothly transfer reads between the SSTables by reducing page cache churn and keeps hot rows hot.
#
# Setting this to a low value will negatively affect performance
# and eventually cause huge heap pressure and a lot of GC activity.
# The "optimal" value depends on the hardware and workload.
#
# Values <= 0 will disable this feature.
sstable_preemptive_open_interval_in_mb: 50

# With pick_level_on_streaming set to true, streamed-in sstables of tables using
# LCS (leveled comaction strategy) will be placed in the same level as on the
# source node (up-leveling may happen though).
#
# The previous behavior, and with pick_level_on_streaming set to false, the
# incoming sstables are placed in level 0.
#
# For operational tasks like 'nodetool refresh' or replacing a node, setting
# pick_level_on_streaming to true can save a lot of compaction work.
#
# Default is true
# pick_level_on_streaming: true

# When enabled, permits Cassandra to zero-copy stream entire eligible
# SSTables between nodes, including every component.
# This speeds up the network transfer significantly subject to
# throttling specified by stream_throughput_outbound_megabits_per_sec.
# Enabling this will reduce the GC pressure on sending and receiving node.
# When unset, the default is enabled. While this feature tries to keep the
# disks balanced, it cannot guarantee it. This feature will be automatically
# disabled if internode encryption is enabled. Currently this can be used with
# Leveled Compaction. Once CASSANDRA-14586 is fixed other compaction strategies
# will benefit as well when used in combination with CASSANDRA-6696.
#
# stream_entire_sstables: true

# Throttle, in megabits per seconds, for the throughput of all outbound streaming file transfers
# on a node. The database does mostly sequential I/O when streaming data during
# bootstrap or repair which can saturate the network connection and degrade
# client (RPC) performance. When not set, the value is 200 Mbps (25 MB/s).
# stream_throughput_outbound_megabits_per_sec: 200

# Throttle for all streaming file transfers between the datacenters,
# this setting allows users to throttle inter dc stream throughput in addition
# to throttling all network stream traffic as configured with
# stream_throughput_outbound_megabits_per_sec.
# When unset, the default is 200 Mbps (25 MB/s).
# inter_dc_stream_throughput_outbound_megabits_per_sec: 200

# How long the coordinator should wait for read operations to complete.
# Lowest acceptable value is 10 ms. This timeout does not apply to
# aggregated queries such as SELECT COUNT(*), MIN(x), etc.
read_request_timeout_in_ms: 5000
# How long the coordinator should wait for seq or index scans to complete.
# Lowest acceptable value is 10 ms. This timeout does not apply to
# aggregated queries such as SELECT COUNT(*), MIN(x), etc.
range_request_timeout_in_ms: 10000
# How long the coordinator should wait for aggregated read operations to complete,
# such as SELECT COUNT(*), MIN(x), etc.
aggregated_request_timeout_in_ms: 120000
# How long the coordinator should wait for writes to complete.
# Lowest acceptable value is 10 ms.
write_request_timeout_in_ms: 2000
# How long the coordinator should wait for counter writes to complete.
# Lowest acceptable value is 10 ms.
counter_write_request_timeout_in_ms: 5000
# How long a coordinator should continue to retry a CAS operation
# that contends with other proposals for the same row.
# Lowest acceptable value is 10 ms.
cas_contention_timeout_in_ms: 1000
# How long the coordinator should wait for truncates to complete
# The long default value allows the database to take a snapshot before removing the data.
# If auto_snapshot is disabled (not recommended), you can reduce this time.
# Lowest acceptable value is 10 ms.
truncate_request_timeout_in_ms: 60000
# The default timeout for other, miscellaneous operations.
# Lowest acceptable value is 10 ms.
request_timeout_in_ms: 10000
# Additional RTT latency between DCs applied to cross dc request. Set this property only when
# cross dc network latency is high. Value must be non-negative.
# Set this value to 0 to apply no additional RTT latency. When unset, the default is 0.
# cross_dc_rtt_in_ms: 0

# How long before a node logs slow queries. SELECT queries that exceed
# this timeout will generate an aggregated log message to identify slow queries.
# Set this value to zero to disable slow query logging.
slow_query_log_timeout_in_ms: 500

# Whether to enable operation timeout information exchange between nodes to accurately
# measure request timeouts.  If disabled, replicas will assume that requests
# were forwarded to them instantly by the coordinator. During overload conditions this means extra
# time is required for processing already-timed-out requests.
#
# Warning: Before enabling this property make sure that NTP (network time protocol) is installed
# and the times are synchronized between the nodes.
cross_node_timeout: false

# Interval to send keep-alive messages. The stream session fails when a keep-alive message
# is not received for 2 keep-alive cycles. When unset, the default is 300 seconds (5 minutes)
# so that a stalled stream times out in 10 minutes (2 cycles).
# streaming_keep_alive_period_in_secs: 300

# Maximum number of connections per host for streaming.
# Increase this when you notice that joins are CPU-bound rather that network-
# bound. For example, a few nodes with large files.
# streaming_connections_per_host: 1


# The sensitivity of the failure detector on an exponential scale. Generally, this setting
# does not need adjusting. phi value that must be reached for a host to be marked down.
# When unset, the internal value is 8.
# phi_convict_threshold: 8

# When a tcp connection to another node is established, cassandra sends an echo
# request to see if the connection is actually usable.  If an echo reply is not
# heard after this many tries, the connection will be destroyed and
# reestablished to try again. Each attempt roughly translates to 1 second.
#
# echo_attempts_before_reset: 10

# endpoint_snitch -- A class that implements the IEndpointSnitch interface. The database uses the
# snitch to locate nodes and route requests. Use only snitch implementations that are bundled with DSE.
#
# THE DATABASE WILL NOT ALLOW YOU TO SWITCH TO AN INCOMPATIBLE SNITCH
# AFTER DATA IS INSERTED INTO THE CLUSTER.  This would cause data loss.
# This means that if you start with the default SimpleSnitch, which
# locates every node on "rack1" in "datacenter1", your only options
# if you need to add another datacenter are GossipingPropertyFileSnitch
# (and the older PFS).  From there, if you want to migrate to an
# incompatible snitch like Ec2Snitch you can do it by adding new nodes
# under Ec2Snitch (which will locate them in a new "datacenter") and
# decommissioning the old nodes.
#
# Supported snitches from Cassandra:
#
# SimpleSnitch:
#    Treats Strategy order as proximity. This can improve cache
#    locality when disabling read repair. Appropriate only for
#    single-datacenter deployments.
#
# GossipingPropertyFileSnitch
#    This should be your go-to snitch for production use.  The rack
#    and datacenter for the local node are defined in
#    cassandra-rackdc.properties and propagated to other nodes via
#    gossip. For migration from the PropertyFileSnitch, uses the cassandra-topology.properties
#    file if it is present.
#
# PropertyFileSnitch:
#    Proximity is determined by rack and data center, which are
#    explicitly configured in cassandra-topology.properties.
#
# Ec2Snitch:
#    Appropriate for EC2 deployments in a single Region. Loads Region
#    and Availability Zone information from the EC2 API. The Region is
#    treated as the datacenter, and the Availability Zone as the rack.
#    Only private IPs are used, so this will not work across multiple
#    Regions.
#
# Ec2MultiRegionSnitch:
#    Uses public IPs as broadcast_address to allow cross-region
#    connectivity. This means you must also set seed addresses to the public
#    IP and open the storage_port or
#    ssl_storage_port on the public IP firewall. For intra-Region
#    traffic, the database will switch to the private IP after
#    establishing a connection.
#
# RackInferringSnitch:
#    Proximity is determined by rack and data center, which are
#    assumed to correspond to the 3rd and 2nd octet of each node's IP
#    address, respectively.  Unless this happens to match your
#    deployment conventions, this is best used as an example of
#    writing a custom Snitch class and is provided in that spirit.
#
# DataStax Enterprise (DSE) provides:
#
# com.datastax.bdp.snitch.DseSimpleSnitch:
#    Proximity is determined by DSE workload, which places transactional,
#    Analytics, and Search nodes into their separate datacenters.
#    Appropriate only for Development deployments.
#
endpoint_snitch: com.datastax.bdp.snitch.DseSimpleSnitch

# How often to perform the more expensive part of host score
# calculation. Use care when reducing this interval, score calculation is CPU intensive.
dynamic_snitch_update_interval_in_ms: 100
# How often to reset all host scores, allowing a bad host to
# possibly recover.
dynamic_snitch_reset_interval_in_ms: 600000
# if set greater than zero, this will allow
# 'pinning' of replicas to hosts in order to increase cache capacity.
# The badness threshold will control how much worse the pinned host has to be
# before the dynamic snitch will prefer other replicas over it.  This is
# expressed as a double which represents a percentage.  Thus, a value of
# 0.2 means the database would continue to prefer the static snitch values
# until the pinned host was 20% worse than the fastest.
dynamic_snitch_badness_threshold: 0.1

# Enable or disable inter-node encryption
# JVM defaults for supported SSL socket protocols and cipher suites can
# be replaced using custom encryption options. This is not recommended
# unless you have policies in place that dictate certain settings, or
# need to disable vulnerable ciphers or protocols in case the JVM cannot
# be updated.
# FIPS compliant settings can be configured at JVM level and should not
# involve changing encryption settings here:
# https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/FIPS.html
# *NOTE* No custom encryption options are enabled at the moment
# The available internode options are : all, none, dc, rack
#
# If set to dc, encrypt the traffic between the DCs
# If set to rack, encrypt the traffic between the racks
#
# The passwords used in these options must match the passwords used when generating
# the keystore and truststore.  For instructions on generating these files, see:
# https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore
#
# KeyStore types can be JKS, JCEKS, PKCS12 or PKCS11
# For PKCS11 the "java.security" file must be updated to register the PKCS11 JNI binding
# and the relevant native binaries installed.
# For more information see: https://docs.oracle.com/javase/8/docs/technotes/guides/security/p11guide.html
server_encryption_options:
    internode_encryption: none
    keystore: resources/dse/conf/.keystore
    keystore_password: cassandra
    truststore: resources/dse/conf/.truststore
    truststore_password: cassandra
    # More advanced defaults below:
    # protocol: TLS
    # algorithm: SunX509
    #
    # replaces the deprecated store_type for keystore, valid types can be JKS, JCEKS, PKCS12 or PKCS11
    # for file based keystores prefer PKCS12
    # keystore_type: JKS
    #
    # replaces the deprecated store_type for truststore, valid types can be JKS, JCEKS, PKCS12 or PKCS11
    # for file based keystores prefer PKCS12
    # truststore_type: JKS
    #
    # cipher_suites: [TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA]
    # require_client_auth: false
    # require_endpoint_verification: false

# enable or disable client/server encryption.
client_encryption_options:
    enabled: false
    # If enabled and optional is set to true, encrypted and unencrypted connections over native transport are handled.
    optional: false
    keystore: resources/dse/conf/.keystore
    keystore_password: cassandra
    # require_client_auth: false
    # Set trustore and truststore_password if require_client_auth is true
    # truststore: resources/dse/conf/.truststore
    # truststore_password: cassandra
    # More advanced defaults below:
    # protocol: TLS
    # algorithm: SunX509
    #
    # replaces the deprecated store_type for keystore, valid types can be JKS, JCEKS, PKCS12 or PKCS11
    # for file based keystores prefer PKCS12
    # keystore_type: JKS
    #
    # replaces the deprecated store_type for truststore, valid types can be JKS, JCEKS, PKCS12 or PKCS11
    # for file based keystores prefer PKCS12
    # truststore_type: JKS
    #
    # cipher_suites: [TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_DHE_RSA_WITH_AES_128_CBC_SHA,TLS_DHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA]

# internode_compression controls whether traffic between nodes is
# compressed.
# Can be:
#
# all
#   all traffic is compressed
#
# dc
#   traffic between different datacenters is compressed
#
# none
#   nothing is compressed.
internode_compression: dc

# Enable or disable tcp_nodelay for inter-dc communication.
# Disabling it will result in larger (but fewer) network packets being sent,
# reducing overhead from the TCP protocol itself, at the cost of increasing
# latency if you block for cross-datacenter responses.
inter_dc_tcp_nodelay: false

# TTL for different trace types used during logging of the repair process.
tracetype_query_ttl: 86400
tracetype_repair_ttl: 604800

# The default Windows kernel timer and scheduling resolution is 15.6ms for power conservation.
# Lowering this value on Windows can provide much tighter latency and better throughput, however
# some virtualized environments may see a negative performance impact from changing this setting
# below their system default. The sysinternals 'clockres' tool can confirm your system's default
# setting.
windows_timer_interval: 1

# UDFs (user defined functions) are disabled by default.
#
# As of Cassandra 3.0 there is a sandbox in place that should prevent execution of evil code.
enable_user_defined_functions: false

# Enables scripted UDFs (JavaScript UDFs).
#
# Java UDFs are always enabled, if enable_user_defined_functions is true.
# Enable this option to be able to use UDFs with "language javascript".
# This option has no effect, if enable_user_defined_functions is false.
#
# Note that JavaScript UDFs are noticeable slower and produce more garbage on the heap than Java UDFs
# and can therefore negatively affect overall database performance.
enable_scripted_user_defined_functions: false

# Optionally disable asynchronous UDF execution.
# Note: Java UDFs are not run asynchronously.
#
# Disabling asynchronous UDF execution also implicitly disables the security-manager!
# By default, asynchronous UDF execution is enabled to be able to detect UDFs that run too long / forever and be
# able to fail fast - i.e. stop the Cassandra daemon, which is currently the only appropriate approach to
# "tell" a user that there's something really wrong with the UDF.
# When you disable async UDF execution, users MUST pay attention to read-timeouts since these timeouts might indicate
# UDFs that run too long or forever which can destabilize the cluster.
# Currently UDFs within the GROUP BY clause are allowed only when asynchronous UDF execution is disabled,
# subjected to the afforementioned security caveats.
enable_user_defined_functions_threads: true

# Time in microseconds (CPU time) after a warning will be emitted to the log and
# to the client that a UDF runs too long.
# Java-UDFs will always emit a warning, script-UDFs only if
# enable_user_defined_functions_threads is set to true.
user_defined_function_warn_micros: 500

# Time in microseconds (CPU time) after a fatal UDF run-time situation is detected.
# For Java-UDFs the function is safely aborted.
# For script-UDFs the action according to user_function_timeout_policy will take place.
# Java-UDFs will always throw an exception, script-UDFs only if
# enable_user_defined_functions_threads is set to true.
user_defined_function_fail_micros: 10000

# If a Java UDF allocates more than user_defined_function_warn_heap_mb on the heap,
# a warning will be emitted to the log and the client.
# Java-UDFs will always emit a warning, script-UDFs only if
# enable_user_defined_functions_threads is set to true.
user_defined_function_warn_heap_mb: 200

# UDFs that allocate more than user_defined_function_fail_heap_mb, will fail.
# For Java-UDFs the function is safely aborted.
# For script-UDFs the action according to user_function_timeout_policy will take place.
# Java-UDFs will always throw an exception, script-UDFs only if
# enable_user_defined_functions_threads is set to true.
user_defined_function_fail_heap_mb: 500

# Defines what to do when a script-UDF ran longer than user_defined_function_fail_timeout.
# (Only valid, if enable_user_defined_functions_threads is set to true)
# Possible options are:
# - 'die' - i.e. it is able to emit a warning to the client before the Cassandra Daemon
#   will shut down.
# - 'die_immediate' - shut down C* daemon immediately (effectively prevent the chance that
#   the client will receive a warning).
# - 'ignore' - just log - the most dangerous option.
user_function_timeout_policy: die


# Enables encrypting data at-rest (on disk). Different key providers are supported, but the default KSKeyProvider reads from
# a JCE-style keystore. A single keystore can hold multiple keys, but the one referenced by
# the "key_alias" is the only key that will be used for encrypt opertaions; previously used keys
# can still (and should!) be in the keystore and will be used on decrypt operations
# to handle key rotation.
#
# DataStax recommends installing Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction
# Policy Files for your version of the JDK to ensure support of all encryption algorithms.
# See the DSE installation documentation.
#
transparent_data_encryption_options:
    enabled: false
    chunk_length_kb: 64
    cipher: AES/CBC/PKCS5Padding
    key_alias: testing:1
    # CBC IV length for AES must be 16 bytes, the default size
    # iv_length: 16
    key_provider:
      - class_name: org.apache.cassandra.security.JKSKeyProvider
        parameters:
          - keystore: conf/.keystore
            keystore_password: cassandra
            store_type: JCEKS
            key_password: cassandra


#####################
# SAFETY THRESHOLDS #
#####################

# GC Pauses greater than 200 ms will be logged at INFO level.
# Adjust this threshold to minimize logging, if necessary.
# gc_log_threshold_in_ms: 200

# GC Pauses greater than gc_warn_threshold_in_ms will be logged at WARN level.
# Adjust this threshold based on your application throughput requirement.
# Set to 0 to deactivate the feature.
# gc_warn_threshold_in_ms: 1000

# Maximum size of any value in SSTables. Safety measure to detect SSTable corruption
# early. Any value size larger than this threshold will result in marking an SSTable
# as corrupted. This value should be positive and less than 2048.
# max_value_size_in_mb: 256

# Probability the database will gossip with one of the seed nodes during each round of gossip.
# Valid range is between 0.01 and 1.0
# seed_gossip_probability: 1.0

# Back-pressure settings #
# If enabled, the coordinator will apply the back-pressure strategy specified below to each mutation
# sent to replicas, with the aim of reducing pressure on overloaded replicas.
back_pressure_enabled: false
# The back-pressure strategy applied.
# The default implementation, RateBasedBackPressure, takes three arguments:
# high ratio, factor, and flow type, and uses the ratio between incoming mutation responses and outgoing mutation requests.
# If below high ratio, outgoing mutations are rate limited according to the incoming rate decreased by the given factor;
# if above high ratio, the rate limiting is increased by the given factor;
# the recommended factor is a whole number between 1 and 10, use larger values for a faster recovery
# at the expense of potentially more dropped mutations;
# the rate limiting is applied according to the flow type: if FAST, it's rate limited at the speed of the fastest replica,
# if SLOW at the speed of the slowest one.
# New strategies can be added. Implementors need to implement org.apache.cassandra.net.BackpressureStrategy and
# provide a public constructor that accepts Map<String, Object>.
back_pressure_strategy:
    - class_name: org.apache.cassandra.net.RateBasedBackPressure
      parameters:
        - high_ratio: 0.90
          factor: 5
          flow: FAST

# Coalescing Strategies #
# Coalescing multiples messages turns out to significantly boost message processing throughput (think doubling or more).
# On bare metal, the floor for packet processing throughput is high enough that many applications won't notice, but in
# virtualized environments, the point at which an application can be bound by network packet processing can be
# surprisingly low compared to the throughput of task processing that is possible inside a VM. It's not that bare metal
# doesn't benefit from coalescing messages, it's that the number of packets a bare metal network interface can process
# is sufficient for many applications such that no load starvation is experienced even without coalescing.
# There are other benefits to coalescing network messages that are harder to isolate with a simple metric like messages
# per second. By coalescing multiple tasks together, a network thread can process multiple messages for the cost of one
# trip to read from a socket, and all the task submission work can be done at the same time reducing context switching
# and increasing cache friendliness of network message processing.

# Strategy to use for coalescing messages.
# Can be fixed, movingaverage or timehorizon, and is disabled by default; enable if you want to tune for higher
# throughput, potentially at the expense of latency.
# You can also specify a subclass of CoalescingStrategies.CoalescingStrategy by name.
# otc_coalescing_strategy: DISABLED

# How many microseconds to wait for coalescing. For fixed strategy, this is the amount of time after the first
# message is received before it will be sent with any accompanying messages. For movingaverage strategy, this is the
# maximum amount of time that will be waited as well as the interval at which messages must arrive on average
# for coalescing to be enabled.
# otc_coalescing_window_us: 100

# Do not try to coalesce messages if we already got that many messages. This should be between 1 and 128 (inclusive).
# otc_coalescing_enough_coalesced_messages: 32

# Size in KB of the direct buffer used to write messages to small/large outbound internode connections. There's one such
# buffer for every node in the cluster, per connection type. Messages larger than this buffer will require the allocation
# of a new buffer, so size this accordingly: it should be big enough to accommodate at least the average message size
# (and possibly more, to allow for batch flushing), but not too large, to avoid running out of memory.
# otc_small_max_message_buffer_kb: 64
# otc_large_max_message_buffer_kb: 1024

# Continuous paging settings. When requested by the client, pages are pushed continuously to the client.
# These settings are used to calculate the maximum memory used:
# (max_concurrent_sessions * max_session_pages * max_page_size_mb).
# The default values (60 x 4 x 8) = 1920 MB of maximum memory used. The only case in which a page may be bigger than
# max_page_size_mb is if an individual CQL row is larger than this value.
continuous_paging:
    # The maximum number of concurrent sessions, any additional session will be rejected with an unavailable error.
    max_concurrent_sessions: 60
    # The maximum number of pages that can be buffered for each session
    max_session_pages: 4
    # The maximum size of a page, in MB. If an individual CQL row is larger than this value, the page can be larger than
    # this value.
    max_page_size_mb: 8
    # The maximum time in milliseconds for which a local continuous query will run, assuming the client continues
    # reading or requesting pages. When this threshold is exceeded, the session is swapped out and rescheduled.
    # Swapping and rescheduling resources ensures the release of resources including those that prevent the memtables
    # from flushing. Adjust when high write workloads exist on tables that have
    # continuous paging requests.
    max_local_query_time_ms: 5000
    # The maximum time the server will wait for a client to request more pages, in seconds, assuming the
    # server queue is full or the client has not required any more pages via a backpressure update request.
    # Increase this value for extremely large page sizes (max_page_size_mb)
    # or for extremely slow networks.
    client_timeout_sec: 600
    # How long the server waits for a cancel request to complete, in seconds.
    cancel_timeout_sec: 5
    # How long the server will wait, in milliseconds, before checking if a continuous paging session can be resumed when
    # the session is paused because of backpressure.
    paused_check_interval_ms: 1

# Track a metric per keyspace indicating whether replication achieved the ideal consistency
# level for writes without timing out. This is different from the consistency level requested by
# each write which may be lower in order to facilitate availability.
# ideal_consistency_level: EACH_QUORUM

# NodeSync settings.
nodesync:
    # The (maximum) rate (in kilobytes per second) for data validation.
    rate_in_kb: 1024

# Emulates DataStax Constellation database-as-a-service defaults.
# 
# When enabled, some defaults (both server side and of connecting DataStax drivers) are modified to match those
# used by DataStax Constellation (DataStax cloud data platform). This includes (but is not limited to) stricter
# guardrails defaults, or the use of LOCAL_QUORUM as default consistency level.
# 
# This can be used as an convenience to develop and test applications meant to run on DataStax Constellation.
# 
# Warning: when enabled, the updated defaults reflect those of DataStax Constellation _at the time_ of the currently
#                 used DSE release. This is a best-effort emulation of said defaults. Further, all nodes must use the same
#                 config value.
# emulate_dbaas_defaults: false

# Guardrails settings.
# guardrails:
  # When executing a scan, within or across a partition, we need to keep the
  # tombstones seen in memory so we can return them to the coordinator, which
  # will use them to make sure other replicas also know about the deleted rows.
  # With workloads that generate a lot of tombstones, this can cause performance
  # problems and even exhaust the server heap.
  # (http://www.datastax.com/dev/blog/cassandra-anti-patterns-queues-and-queue-like-datasets)
  # Adjust the thresholds here if you understand the dangers and want to
  # scan more tombstones anyway.  These thresholds may also be adjusted at runtime
  # using the StorageService mbean.
  #
  # Default tombstone_warn_threshold is 1000, may differ if emulate_dbaas_defaults is enabled
  # Default tombstone_failure_threshold is 100000, may differ if emulate_dbaas_defaults is enabled
  # tombstone_warn_threshold: 1000
  # tombstone_failure_threshold: 100000

  # Log a warning when compacting partitions larger than this value.
  # Default value is 100mb, may differ if emulate_dbaas_defaults is enabled
  # partition_size_warn_threshold_in_mb: 100

  # Log WARN on any multiple-partition batch size that exceeds this value. 64kb per batch by default.
  # Use caution when increasing the size of this threshold as it can lead to node instability.
  # Default value is 64kb, may differ if emulate_dbaas_defaults is enabled
  # batch_size_warn_threshold_in_kb: 64

  # Fail any multiple-partition batch that exceeds this value. The calculated default is 640kb (10x warn threshold).
  # Default value is 640kb, may differ if emulate_dbaas_defaults is enabled
  # batch_size_fail_threshold_in_kb: 640

  # Log WARN on any batches not of type LOGGED than span across more partitions than this limit.
  # Default value is 10, may differ if emulate_dbaas_defaults is enabled
  # unlogged_batch_across_partitions_warn_threshold: 10

  # Failure threshold to prevent writing large column value into Cassandra.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # column_value_size_failure_threshold_in_kb: -1

  # Failure threshold to prevent creating more columns per table than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # columns_per_table_failure_threshold: -1

  # Failure threshold to prevent creating more fields in user-defined-type than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # fields_per_udt_failure_threshold: -1

  # Warning threshold to warn when encountering larger size of collection data than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # collection_size_warn_threshold_in_kb: -1

  # Warning threshold to warn when encountering more elements in collection than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # items_per_collection_warn_threshold: -1

  # Whether read-before-write operation is allowed, eg. setting list element by index, removing list element
  # by index. Note: LWT is always allowed.
  # Default true to allow read before write operation, may differ if emulate_dbaas_defaults is enabled
  # read_before_write_list_operations_enabled: true

  # Failure threshold to prevent creating more secondary index per table than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # secondary_index_per_table_failure_threshold: -1

  # Failure threshold to prevent creating more materialized views per table than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # materialized_view_per_table_failure_threshold: -1

  # Warn threshold to warn creating more tables than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # tables_warn_threshold: -1

  # Failure threshold to prevent creating more tables than threshold.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # tables_failure_threshold: -1

  # Preventing creating tables with provided configurations.
  # Default all properties are allowed, may differ if emulate_dbaas_defaults is enabled
  # table_properties_disallowed:

  # Whether to allow user-provided timestamp in write request
  # Default true to allow user-provided timestamp, may differ if emulate_dbaas_defaults is enabled
  # user_timestamps_enabled: true

  # Preventing query with provided consistency levels
  # Default all consistency levels are allowed.
  # write_consistency_levels_disallowed:

  # Failure threshold to prevent providing larger paging by bytes than threshold, also served as a hard paging limit
  # when paging by rows is used.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # page_size_failure_threshold_in_kb: -1

  # Failure threshold to prevent IN query creating size of cartesian product exceeding threshold, eg.
  # "a in (1,2,...10) and b in (1,2...10)" results in cartesian product of 100.
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # in_select_cartesian_product_failure_threshold: -1

  # Failure threshold to prevent IN query containing more partition keys than threshold
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # partition_keys_in_select_failure_threshold: -1

  # Warning threshold to warn when local disk usage exceeding threshold. Valid values: (1, 100]
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # disk_usage_percentage_warn_threshold: -1

  # Failure threshold to reject write requests if replica disk usage exceeding threshold. Valid values: (1, 100]
  # Default -1 to disable, may differ if emulate_dbaas_defaults is enabled
  # disk_usage_percentage_failure_threshold: -1

# TPC settings - WARNING it is generally not advised to change these values unless directed by a performance expert

# Number of cores used by the internal Threads Per Core architecture (TPC). This setting corresponds to the
# number of event loops that will be created internally. Do not tune. DataStax recommends contacting the DataStax Services
# team before changing this value. If unset or commented out (the default), the calculated default value is the number
# of available processors on the machine minus one.
# tpc_cores:

# Number of cores used for reads. Do not tune. DataStax recommends contacting the DataStax Services
# team before changing this value. By default this is set to min(tpc_cores, io_global_queue_depth / 4), which means
# that each IO queue must have at least a local depth of 4 and we choose a number of IO queues, or IO cores, such that the
# combined depth does not exceed io_global_queue_depth, capped to the number of TPC cores.
# tpc_io_cores:

# The global IO queue depth that is used for reads when AIO is enabled (the default for SSDs).
# The default value used is the value in /sys/class/block/sd[a|b...]/queue/nr_requests,
# which is typically 128. This default value is a starting point for tuning. You can also run tools/bin/disk_cal.py to
# determine the ideal queue depth for a specific disk. However, capping to the ideal
# queue depth assumes that all TPC IO cores will be fully working during read workloads. If that's not the case,
# you might want to double the ideal queue depth, for example. Exceeding the value used by the Linux IO scheduler (128)
# is never advantageous and will result in higher latency.
# Do _not_ tune. DataStax recommends contacting the DataStax Services team before changing this value.
# io_global_queue_depth:


# Enable memory leaks detection. These parameters should not be used unless directed by a support engineer or
# consultant. See "nodetool help leaksdetection" for the documentation.
#leaks_detection_params:
#  sampling_probability: 0.01
#  max_stacks_cache_size_mb: 32
#  num_access_records: 0
#  max_stack_depth: 30