forked from elastic/elasticsearch
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Cache completion stats between refreshes
Computing the stats for completion fields may involve a significant amount of work since it walks every field of every segment looking for completion fields. Innocuous-looking APIs like `GET _stats` or `GET _cluster/stats` do this for every shard in the cluster. This repeated work is unnecessary since these stats do not change between refreshes; in many indices they remain constant for a long time. This commit introduces a cache for these stats which is invalidated on a refresh, allowing most stats calls to bypass the work needed to compute them on most shards. Closes elastic#51915
- Loading branch information
1 parent
0582bb4
commit 5be0d83
Showing
6 changed files
with
418 additions
and
35 deletions.
There are no files selected for viewing
66 changes: 66 additions & 0 deletions
66
rest-api-spec/src/main/resources/rest-api-spec/test/indices.stats/40_updates_on_refresh.yml
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| --- | ||
| setup: | ||
|
|
||
| - do: | ||
| indices.create: | ||
| index: test1 | ||
| wait_for_active_shards: all | ||
| body: | ||
| settings: | ||
| # Limit the number of shards so that shards are unlikely | ||
| # to be relocated or being initialized between the test | ||
| # set up and the test execution | ||
| index.number_of_shards: 3 | ||
| index.number_of_replicas: 0 | ||
| mappings: | ||
| properties: | ||
| bar: | ||
| type: text | ||
| fielddata: true | ||
| fields: | ||
| completion: | ||
| type: completion | ||
|
|
||
| - do: | ||
| cluster.health: | ||
| wait_for_no_relocating_shards: true | ||
|
|
||
| - do: | ||
| index: | ||
| index: test1 | ||
| id: 1 | ||
| body: { "bar": "bar" } | ||
|
|
||
| - do: | ||
| index: | ||
| index: test1 | ||
| id: 2 | ||
| body: { "bar": "foo" } | ||
|
|
||
| - do: | ||
| indices.refresh: {} | ||
|
|
||
| --- | ||
| "Completion stats": | ||
| - do: | ||
| indices.stats: { completion_fields: "*" } | ||
|
|
||
| - match: { _shards.failed: 0} | ||
| - gt: { _all.total.completion.fields.bar\.completion.size_in_bytes: 0 } | ||
| - gt: { _all.total.completion.size_in_bytes: 0 } | ||
| - set: { _all.total.completion.size_in_bytes: original_size } | ||
|
|
||
| - do: | ||
| index: | ||
| index: test1 | ||
| id: 3 | ||
| body: { "bar": "foo", "baz": "foo" } | ||
|
|
||
| - do: | ||
| indices.refresh: {} | ||
|
|
||
| - do: | ||
| indices.stats: { completion_fields: "*" } | ||
|
|
||
| - match: { _shards.failed: 0} | ||
| - gt: { _all.total.completion.size_in_bytes: $original_size } |
115 changes: 115 additions & 0 deletions
115
server/src/main/java/org/elasticsearch/index/engine/CompletionStatsCache.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch licenses this file to you under | ||
| * the Apache License, Version 2.0 (the "License"); you may | ||
| * not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
| package org.elasticsearch.index.engine; | ||
|
|
||
| import com.carrotsearch.hppc.ObjectLongHashMap; | ||
| import com.carrotsearch.hppc.cursors.ObjectLongCursor; | ||
| import org.apache.lucene.index.FieldInfo; | ||
| import org.apache.lucene.index.LeafReader; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.index.Terms; | ||
| import org.apache.lucene.search.ReferenceManager; | ||
| import org.apache.lucene.search.suggest.document.CompletionTerms; | ||
| import org.elasticsearch.action.ActionListener; | ||
| import org.elasticsearch.action.support.PlainActionFuture; | ||
| import org.elasticsearch.common.FieldMemoryStats; | ||
| import org.elasticsearch.common.regex.Regex; | ||
| import org.elasticsearch.search.suggest.completion.CompletionStats; | ||
|
|
||
| import java.util.concurrent.atomic.AtomicReference; | ||
| import java.util.function.Supplier; | ||
|
|
||
| class CompletionStatsCache implements ReferenceManager.RefreshListener { | ||
|
|
||
| private final Supplier<Engine.Searcher> searcherSupplier; | ||
|
|
||
| /** | ||
| * Contains a future (i.e. non-null) if another thread is already computing stats, in which case wait for this computation to | ||
| * complete. Contains null otherwise, in which case compute the stats ourselves and save them here for other threads to use. | ||
| * Futures are eventually completed with stats that include all fields, requiring further filtering (see | ||
| * {@link CompletionStatsCache#filterCompletionStatsByFieldName}). | ||
| */ | ||
| private final AtomicReference<PlainActionFuture<CompletionStats>> completionStatsFutureRef = new AtomicReference<>(); | ||
|
|
||
| CompletionStatsCache(Supplier<Engine.Searcher> searcherSupplier) { | ||
| this.searcherSupplier = searcherSupplier; | ||
| } | ||
|
|
||
| CompletionStats get(String... fieldNamePatterns) { | ||
| final PlainActionFuture<CompletionStats> newFuture = new PlainActionFuture<>(); | ||
| final PlainActionFuture<CompletionStats> oldFuture = completionStatsFutureRef.compareAndExchange(null, newFuture); | ||
|
|
||
| if (oldFuture != null) { | ||
| // we lost the race, someone else is already computing stats, so we wait for that to finish | ||
| return filterCompletionStatsByFieldName(fieldNamePatterns, oldFuture.actionGet()); | ||
| } | ||
|
|
||
| // we won the race, nobody else is already computing stats, so it's up to us | ||
| ActionListener.completeWith(newFuture, () -> { | ||
| long sizeInBytes = 0; | ||
| final ObjectLongHashMap<String> completionFields = new ObjectLongHashMap<>(); | ||
|
|
||
| try (Engine.Searcher currentSearcher = searcherSupplier.get()) { | ||
| for (LeafReaderContext atomicReaderContext : currentSearcher.getIndexReader().leaves()) { | ||
| LeafReader atomicReader = atomicReaderContext.reader(); | ||
| for (FieldInfo info : atomicReader.getFieldInfos()) { | ||
| Terms terms = atomicReader.terms(info.name); | ||
| if (terms instanceof CompletionTerms) { | ||
| // TODO: currently we load up the suggester for reporting its size | ||
| final long fstSize = ((CompletionTerms) terms).suggester().ramBytesUsed(); | ||
| completionFields.addTo(info.name, fstSize); | ||
| sizeInBytes += fstSize; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return new CompletionStats(sizeInBytes, new FieldMemoryStats(completionFields)); | ||
| }); | ||
|
|
||
| return filterCompletionStatsByFieldName(fieldNamePatterns, newFuture.actionGet()); | ||
| } | ||
|
|
||
| private static CompletionStats filterCompletionStatsByFieldName(String[] fieldNamePatterns, CompletionStats fullCompletionStats) { | ||
| final FieldMemoryStats fieldMemoryStats; | ||
| if (fieldNamePatterns != null && fieldNamePatterns.length > 0) { | ||
| final ObjectLongHashMap<String> completionFields = new ObjectLongHashMap<>(fieldNamePatterns.length); | ||
| for (ObjectLongCursor<String> fieldCursor : fullCompletionStats.getFields()) { | ||
| if (Regex.simpleMatch(fieldNamePatterns, fieldCursor.key)) { | ||
| completionFields.addTo(fieldCursor.key, fieldCursor.value); | ||
| } | ||
| } | ||
| fieldMemoryStats = new FieldMemoryStats(completionFields); | ||
| } else { | ||
| fieldMemoryStats = null; | ||
| } | ||
| return new CompletionStats(fullCompletionStats.getSizeInBytes(), fieldMemoryStats); | ||
| } | ||
|
|
||
| @Override | ||
| public void beforeRefresh() { | ||
| } | ||
|
|
||
| @Override | ||
| public void afterRefresh(boolean didRefresh) { | ||
| if (didRefresh) { | ||
| completionStatsFutureRef.set(null); | ||
| } | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.