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server.properties
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# see kafka.server.KafkaConfig for additional details and defaults
############################# Server Basics #############################
# 每个broker都可以用一个唯一的非负整数id进行标识；这个id可以作为broker的“名字”，并且它的存在使得broker无须混淆consumers就可以迁移到不同的host/port上。你可以选择任意你喜欢的数字作为id，只要id是唯一的即可
broker.id=0
# 能够删除topic开关, default value is false
delete.topic.enable=true
############################# Socket Server Settings #############################
# The address the socket server listens on. It will get the value returned from
# java.net.InetAddress.getCanonicalHostName() if not configured.
# FORMAT:
# listeners = listener_name://host_name:port
# EXAMPLE:
# listeners = PLAINTEXT://your.host.name:9092
#listeners=PLAINTEXT://:9092
# Hostname and port the broker will advertise to producers and consumers. If not set,
# it uses the value for "listeners" if configured. Otherwise, it will use the value
# returned from java.net.InetAddress.getCanonicalHostName().
#advertised.listeners=PLAINTEXT://your.host.name:9092
# Maps listener names to security protocols, the default is for them to be the same. See the config documentation for more details
#listener.security.protocol.map=PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL
# server用来处理网络请求的网络线程数目；一般你不需要更改这个属性
num.network.threads=3
# server用来处理请求的I/O线程的数目；这个线程数目至少要等于硬盘的个数
num.io.threads=8
# server使用的send buffer大小
socket.send.buffer.bytes=102400
# server使用的recive buffer大小
socket.receive.buffer.bytes=102400
# socket请求的最大数值，防止serverOOM，message.max.bytes必然要小于socket.request.max.bytes，会被topic创建时的指定参数覆盖
socket.request.max.bytes=104857600
############################# Log Basics #############################
# A comma seperated list of directories under which to store log files
log.dirs=/mnt/kafka_2.11-0.11.0.0/kafka-logs-broker0
# 每个topic的分区个数，若是在topic创建时候没有指定的话会被topic创建时的指定参数覆盖
num.partitions=1
# 每个数据目录用来日志恢复的线程数目
num.recovery.threads.per.data.dir=1
############################# Internal Topic Settings #############################
# The replication factor for the group metadata internal topics "__consumer_offsets" and "__transaction_state"
# For anything other than development testing, a value greater than 1 is recommended for to ensure availability such as 3.
# topic的offset的备份份数。建议设置更高的数字保证更高的可用性
offsets.topic.replication.factor=3
transaction.state.log.replication.factor=1
transaction.state.log.min.isr=1
############################# Log Flush Policy #############################
# Messages are immediately written to the filesystem but by default we only fsync() to sync
# the OS cache lazily. The following configurations control the flush of data to disk.
# There are a few important trade-offs here:
# 1. Durability: Unflushed data may be lost if you are not using replication.
# 2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush.
# 3. Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to exceessive seeks.
# The settings below allow one to configure the flush policy to flush data after a period of time or
# every N messages (or both). This can be done globally and overridden on a per-topic basis.
# The number of messages to accept before forcing a flush of data to disk
# log文件“sync”到磁盘之前累积的消息条数。因为磁盘IO操作是一个慢操作，但又是一个“数据可靠性”的必要手段，所以检查是否需要固化到硬盘的时间间隔。
# 需要在“数据可靠性”与“性能”之间做必要的权衡，如果此值过大，将会导致每次“发sync”的时间过长（IO阻塞），如果此值过小，将会导致“fsync”的时间较长（IO阻塞），
# 如果此值过小，将会导致”发sync“的次数较多，这也就意味着整体的client请求有一定的延迟，物理server故障，将会导致没有fsync的消息丢失。
#log.flush.interval.messages=10000
# The maximum amount of time a message can sit in a log before we force a flush
#log.flush.interval.ms=1000
############################# Log Retention Policy #############################
# The following configurations control the disposal of log segments. The policy can
# be set to delete segments after a period of time, or after a given size has accumulated.
# A segment will be deleted whenever *either* of these criteria are met. Deletion always happens
# from the end of the log.
# 每个日志文件删除之前保存的时间。默认数据保存时间对所有topic都一样。log.retention.minutes 和 log.retention.bytes 都是用来设置删除日志文件的，无论哪个属性已经溢出。这个属性设置可以在topic基本设置时进行覆盖。
log.retention.hours=168
# A size-based retention policy for logs. Segments are pruned from the log as long as the remaining
# segments don't drop below log.retention.bytes. Functions independently of log.retention.hours.
#log.retention.bytes=1073741824
# The maximum size of a log segment file. When this size is reached a new log segment will be created.
log.segment.bytes=1073741824
# #每隔300000毫秒去检查上面配置的log失效时间
log.retention.check.interval.ms=300000
############################# Zookeeper #############################
# Zookeeper connection string (see zookeeper docs for details).
# This is a comma separated host:port pairs, each corresponding to a zk
# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
# You can also append an optional chroot string to the urls to specify the
# root directory for all kafka znodes.
zookeeper.connect=locahost:2181
# Timeout in ms for connecting to zookeeper
zookeeper.connection.timeout.ms=6000
############################# Group Coordinator Settings #############################
# The following configuration specifies the time, in milliseconds, that the GroupCoordinator will delay the initial consumer rebalance.
# The rebalance will be further delayed by the value of group.initial.rebalance.delay.ms as new members join the group, up to a maximum of max.poll.interval.ms.
# The default value for this is 3 seconds.
# We override this to 0 here as it makes for a better out-of-the-box experience for development and testing.
# However, in production environments the default value of 3 seconds is more suitable as this will help to avoid unnecessary, and potentially expensive, rebalances during application startup.
# 对于用户来说，这个改进最直接的效果就是新增了一个broker配置：group.initial.rebalance.delay.ms，
# 默认是3秒钟。用户需要在server.properties文件中自行修改为想要配置的值。这个参数的主要效果就是让coordinator推迟空消费组接收到成员加入请求后本应立即开启的rebalance。
# 在实际使用时，假设你预估你的所有consumer组成员加入需要在10s内完成，那么你就可以设置该参数=10000。目前来看，这个参数的使用还是很方便的~
group.initial.rebalance.delay.ms=10