Adds a concept of request_id for logging/correlation purpose.

We also measure the amount of memory taken by a split search, and log
this.

quickwit/quickwit-directories/src/caching_directory.rs

@@ -42,12 +42,18 @@ impl CachingDirectory {
     /// Warming: The resulting CacheDirectory will cache all information without ever
     /// removing any item from the cache.
     pub fn new_unbounded(underlying: Arc<dyn Directory>) -> CachingDirectory {
-        CachingDirectory {
-            underlying,
-            cache: Arc::new(ByteRangeCache::with_infinite_capacity(
-                &quickwit_storage::STORAGE_METRICS.shortlived_cache,
-            )),
-        }
+        let byte_range_cache = ByteRangeCache::with_infinite_capacity(
+            &quickwit_storage::STORAGE_METRICS.shortlived_cache,
+        );
+        CachingDirectory::new(underlying, Arc::new(byte_range_cache))
+    }
+
+    /// Creates a new CachingDirectory.
+    ///
+    /// Warming: The resulting CacheDirectory will cache all information without ever
+    /// removing any item from the cache.
+    pub fn new(underlying: Arc<dyn Directory>, cache: Arc<ByteRangeCache>) -> CachingDirectory {
+        CachingDirectory { underlying, cache }
     }
 }
 

quickwit/quickwit-directories/src/hot_directory.rs

@@ -491,6 +491,7 @@ pub fn write_hotcache<D: Directory>(
     // We use the caching directory here in order to defensively ensure that
     // the content of the directory that will be written in the hotcache is precisely
     // the same that was read on the first pass.
+
     let caching_directory = CachingDirectory::new_unbounded(Arc::new(directory));
     let debug_proxy_directory = DebugProxyDirectory::wrap(caching_directory);
     let index = Index::open(debug_proxy_directory.clone())?;

quickwit/quickwit-proto/protos/quickwit/search.proto

@@ -191,6 +191,10 @@ message ListFields {
 // -- Search -------------------
 
 message SearchRequest {
+  // id used for logging/debugging purpose.
+  // If left empty, the root node will generate one.
+  string request_id = 18;
+
   // Index ID patterns
   repeated string index_id_patterns = 1;
 

quickwit/quickwit-search/src/fetch_docs.rs

@@ -179,7 +179,7 @@ async fn fetch_docs_in_split(
         index_storage,
         split,
         Some(doc_mapper.tokenizer_manager()),
-        false,
+        None,
     )
     .await
     .context("open-index-for-split")?;

quickwit/quickwit-search/src/leaf.rs

@@ -35,8 +35,8 @@ use quickwit_proto::search::{
 use quickwit_query::query_ast::{BoolQuery, QueryAst, QueryAstTransformer, RangeQuery, TermQuery};
 use quickwit_query::tokenizers::TokenizerManager;
 use quickwit_storage::{
-    wrap_storage_with_cache, BundleStorage, MemorySizedCache, OwnedBytes, SplitCache, Storage,
-    StorageResolver, TimeoutAndRetryStorage,
+    wrap_storage_with_cache, BundleStorage, ByteRangeCache, MemorySizedCache, OwnedBytes,
+    SplitCache, Storage, StorageResolver, TimeoutAndRetryStorage,
 };
 use tantivy::aggregation::agg_req::{AggregationVariants, Aggregations};
 use tantivy::aggregation::AggregationLimitsGuard;
@@ -133,7 +133,7 @@ pub(crate) async fn open_index_with_caches(
     index_storage: Arc<dyn Storage>,
     split_and_footer_offsets: &SplitIdAndFooterOffsets,
     tokenizer_manager: Option<&TokenizerManager>,
-    ephemeral_unbounded_cache: bool,
+    ephemeral_unbounded_cache: Option<Arc<ByteRangeCache>>,
 ) -> anyhow::Result<Index> {
     // Let's add a storage proxy to retry `get_slice` requests if they are taking too long,
     // if configured in the searcher config.
@@ -165,8 +165,8 @@ pub(crate) async fn open_index_with_caches(
 
     let directory = StorageDirectory::new(bundle_storage_with_cache);
 
-    let hot_directory = if ephemeral_unbounded_cache {
-        let caching_directory = CachingDirectory::new_unbounded(Arc::new(directory));
+    let hot_directory = if let Some(cache) = ephemeral_unbounded_cache {
+        let caching_directory = CachingDirectory::new(Arc::new(directory), cache);
         HotDirectory::open(caching_directory, hotcache_bytes.read_bytes()?)?
     } else {
         HotDirectory::open(directory, hotcache_bytes.read_bytes()?)?
@@ -399,12 +399,15 @@ async fn leaf_search_single_split(
     }
 
     let split_id = split.split_id.to_string();
+    let byte_range_cache = Arc::new(ByteRangeCache::with_infinite_capacity(
+        &quickwit_storage::STORAGE_METRICS.shortlived_cache,
+    ));
     let index = open_index_with_caches(
         searcher_context,
         storage,
         &split,
         Some(doc_mapper.tokenizer_manager()),
-        true,
+        Some(byte_range_cache.clone()),
     )
     .await?;
     let split_schema = index.schema();
@@ -425,6 +428,9 @@ async fn leaf_search_single_split(
     warmup_info.simplify();
 
     warmup(&searcher, &warmup_info).await?;
+
+    info!(request=%search_request.request_id, input_data=byte_range_cache.get_num_bytes(), "split search input data memory");
+
     let span = info_span!("tantivy_search");
 
     let (search_request, leaf_search_response) = {

quickwit/quickwit-search/src/list_terms.rs

@@ -33,7 +33,7 @@ use quickwit_proto::search::{
     SplitIdAndFooterOffsets, SplitSearchError,
 };
 use quickwit_proto::types::IndexUid;
-use quickwit_storage::Storage;
+use quickwit_storage::{ByteRangeCache, Storage};
 use tantivy::schema::{Field, FieldType};
 use tantivy::{ReloadPolicy, Term};
 use tracing::{debug, error, info, instrument};
@@ -216,7 +216,16 @@ async fn leaf_list_terms_single_split(
     storage: Arc<dyn Storage>,
     split: SplitIdAndFooterOffsets,
 ) -> crate::Result<LeafListTermsResponse> {
-    let index = open_index_with_caches(searcher_context, storage, &split, None, true).await?;
+    let cache =
+        ByteRangeCache::with_infinite_capacity(&quickwit_storage::STORAGE_METRICS.shortlived_cache);
+    let index = open_index_with_caches(
+        searcher_context,
+        storage,
+        &split,
+        None,
+        Some(Arc::new(cache)),
+    )
+    .await?;
     let split_schema = index.schema();
     let reader = index
         .reader_builder()

quickwit/quickwit-search/src/root.rs

@@ -50,6 +50,7 @@ use tantivy::collector::Collector;
 use tantivy::schema::{Field, FieldEntry, FieldType, Schema};
 use tantivy::TantivyError;
 use tracing::{debug, info, info_span, instrument};
+use ulid::Ulid;
 
 use crate::cluster_client::ClusterClient;
 use crate::collector::{make_merge_collector, QuickwitAggregations};
@@ -352,6 +353,7 @@ fn simplify_search_request_for_scroll_api(req: &SearchRequest) -> crate::Result<
 
     // We do not mutate
     Ok(SearchRequest {
+        request_id: req.request_id.clone(),
         index_id_patterns: req.index_id_patterns.clone(),
         query_ast: req.query_ast.clone(),
         start_timestamp: req.start_timestamp,
@@ -1107,14 +1109,21 @@ async fn refine_and_list_matches(
 /// 2. Merges the search results.
 /// 3. Sends fetch docs requests to multiple leaf nodes.
 /// 4. Builds the response with docs and returns.
-#[instrument(skip_all)]
+#[instrument(skip_all, fields(request_id))]
 pub async fn root_search(
     searcher_context: &SearcherContext,
     mut search_request: SearchRequest,
     mut metastore: MetastoreServiceClient,
     cluster_client: &ClusterClient,
 ) -> crate::Result<SearchResponse> {
-    info!(searcher_context = ?searcher_context, search_request = ?search_request);
+    if search_request.request_id.is_empty() {
+        search_request.request_id = Ulid::new().to_string();
+    }
+
+    let request_id = search_request.request_id.clone();
+    tracing::Span::current().record("request_id", request_id.as_str());
+
+    info!(search_request = ?search_request);
     let start_instant = tokio::time::Instant::now();
     let list_indexes_metadatas_request = ListIndexesMetadataRequest {
         index_id_patterns: search_request.index_id_patterns.clone(),
@@ -1169,9 +1178,14 @@ pub async fn root_search(
     )
     .await;
 
+    let elapsed = start_instant.elapsed();
+
+    info!(request_id=%request_id.as_str(), num_docs=num_docs, num_splits=num_splits, elapsed_time_millis=%elapsed.as_millis(), "search completed");
+
     if let Ok(search_response) = &mut search_response_result {
-        search_response.elapsed_time_micros = start_instant.elapsed().as_micros() as u64;
+        search_response.elapsed_time_micros = elapsed.as_micros() as u64;
     }
+
     let label_values = if search_response_result.is_ok() {
         ["success"]
     } else {

quickwit/quickwit-search/src/search_stream/leaf.rs

@@ -29,7 +29,7 @@ use quickwit_proto::search::{
     LeafSearchStreamResponse, OutputFormat, SearchRequest, SearchStreamRequest,
     SplitIdAndFooterOffsets,
 };
-use quickwit_storage::Storage;
+use quickwit_storage::{ByteRangeCache, Storage};
 use tantivy::columnar::{DynamicColumn, HasAssociatedColumnType};
 use tantivy::fastfield::Column;
 use tantivy::query::Query;
@@ -127,12 +127,15 @@ async fn leaf_search_stream_single_split(
         &split,
     );
 
+    let cache =
+        ByteRangeCache::with_infinite_capacity(&quickwit_storage::STORAGE_METRICS.shortlived_cache);
+
     let index = open_index_with_caches(
         &searcher_context,
         storage,
         &split,
         Some(doc_mapper.tokenizer_manager()),
-        true,
+        Some(Arc::new(cache)),
     )
     .await?;
     let split_schema = index.schema();

quickwit/quickwit-serve/src/elasticsearch_api/rest_handler.rs

@@ -336,6 +336,7 @@ fn build_request_for_es_api(
 
     Ok((
         quickwit_proto::search::SearchRequest {
+            request_id: String::default(),
             index_id_patterns,
             query_ast: serde_json::to_string(&query_ast).expect("Failed to serialize QueryAst"),
             max_hits,

quickwit/quickwit-serve/src/search_api/rest_handler.rs

@@ -283,6 +283,7 @@ pub fn search_request_from_api_request(
     let query_ast = query_ast_from_user_text(&search_request.query, search_request.search_fields);
     let query_ast_json = serde_json::to_string(&query_ast)?;
     let search_request = quickwit_proto::search::SearchRequest {
+        request_id: String::default(),
         index_id_patterns,
         query_ast: query_ast_json,
         snippet_fields: search_request.snippet_fields.unwrap_or_default(),

quickwit/quickwit-storage/src/cache/byte_range_cache.rs

@@ -356,6 +356,11 @@ impl ByteRangeCache {
         }
     }
 
+    /// Overall amount of bytes stored in the cache.
+    pub fn get_num_bytes(&self) -> u64 {
+        self.inner.lock().unwrap().num_bytes
+    }
+
     /// If available, returns the cached view of the slice.
     pub fn get_slice(&self, path: &Path, byte_range: Range<usize>) -> Option<OwnedBytes> {
         self.inner.lock().unwrap().get_slice(path, byte_range)