Do not force refresh when write indexing buffer (#50769)
Today we periodically check the indexing buffer memory every 5 seconds or after we have used 1/30 of the configured memory. If the total used memory is over the threshold, then we refresh the "largest" shards. If refreshing takes longer these intervals (i.e., 5s or 1/30 buffer), then we continue to enqueue refreshes to these shards. This leads to two issues: - The refresh thread pool can be exhausted and other shards can't refresh - Execute too many refreshes for the "largest" shards With this change, we only refresh the largest shards if they are not refreshing. Here we rely on the periodic check to trigger another refresh if needed. We can harden this by making the ongoing refresh triggers the memory check when it's completed. I opted out this option in this PR for simplicity. See: https://discuss.elastic.co/t/write-queue-continue-to-rise/213652/
This commit is contained in:
Nhat Nguyen
parent
981e4b8d17
commit
f4aabdcd89
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@ -1639,9 +1639,7 @@ public class InternalEngine extends Engine {
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@Override
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public void writeIndexingBuffer() throws EngineException {
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// we obtain a read lock here, since we don't want a flush to happen while we are writing
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// since it flushes the index as well (though, in terms of concurrency, we are allowed to do it)
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refresh("write indexing buffer", SearcherScope.INTERNAL, true);
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refresh("write indexing buffer", SearcherScope.INTERNAL, false);
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}
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@Override
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@ -0,0 +1,101 @@
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/*
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* Licensed to Elasticsearch under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.elasticsearch.indices;
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import org.apache.logging.log4j.LogManager;
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import org.elasticsearch.action.admin.indices.forcemerge.ForceMergeResponse;
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import org.elasticsearch.common.settings.Settings;
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import org.elasticsearch.index.IndexService;
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import org.elasticsearch.index.IndexSettings;
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import org.elasticsearch.index.codec.CodecService;
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import org.elasticsearch.index.engine.EngineConfig;
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import org.elasticsearch.index.engine.EngineFactory;
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import org.elasticsearch.index.engine.InternalEngine;
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import org.elasticsearch.index.refresh.RefreshStats;
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import org.elasticsearch.index.shard.IndexShard;
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import org.elasticsearch.plugins.EnginePlugin;
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import org.elasticsearch.plugins.Plugin;
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import org.elasticsearch.test.ESSingleNodeTestCase;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import java.util.Optional;
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import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
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import static org.hamcrest.Matchers.greaterThan;
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public class IndexingMemoryControllerIT extends ESSingleNodeTestCase {
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@Override
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protected Settings nodeSettings() {
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return Settings.builder().put(super.nodeSettings())
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// small indexing buffer so that we can trigger refresh after buffering 100 deletes
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.put("indices.memory.index_buffer_size", "1kb").build();
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}
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@Override
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protected Collection<Class<? extends Plugin>> getPlugins() {
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final List<Class<? extends Plugin>> plugins = new ArrayList<>(super.getPlugins());
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plugins.add(TestEnginePlugin.class);
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return plugins;
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}
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public static class TestEnginePlugin extends Plugin implements EnginePlugin {
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EngineConfig engineConfigWithLargerIndexingMemory(EngineConfig config) {
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// We need to set a larger buffer for the IndexWriter; otherwise, it will flush before the IndexingMemoryController.
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Settings settings = Settings.builder().put(config.getIndexSettings().getSettings())
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.put("indices.memory.index_buffer_size", "10mb").build();
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IndexSettings indexSettings = new IndexSettings(config.getIndexSettings().getIndexMetaData(), settings);
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return new EngineConfig(config.getShardId(), config.getAllocationId(), config.getThreadPool(),
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indexSettings, config.getWarmer(), config.getStore(), config.getMergePolicy(), config.getAnalyzer(),
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config.getSimilarity(), new CodecService(null, LogManager.getLogger(IndexingMemoryControllerIT.class)),
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config.getEventListener(), config.getQueryCache(),
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config.getQueryCachingPolicy(), config.getTranslogConfig(), config.getFlushMergesAfter(),
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config.getExternalRefreshListener(), config.getInternalRefreshListener(), config.getIndexSort(),
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config.getCircuitBreakerService(), config.getGlobalCheckpointSupplier(), config.retentionLeasesSupplier(),
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config.getPrimaryTermSupplier(), config.getTombstoneDocSupplier());
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}
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@Override
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public Optional<EngineFactory> getEngineFactory(IndexSettings indexSettings) {
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return Optional.of(config -> new InternalEngine(engineConfigWithLargerIndexingMemory(config)));
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}
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}
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// #10312
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public void testDeletesAloneCanTriggerRefresh() throws Exception {
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IndexService indexService = createIndex("index", Settings.builder().put("index.number_of_shards", 1)
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.put("index.number_of_replicas", 0).put("index.refresh_interval", -1).build());
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IndexShard shard = indexService.getShard(0);
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for (int i = 0; i < 100; i++) {
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client().prepareIndex("index", "_doc").setId(Integer.toString(i)).setSource("field", "value").get();
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}
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// Force merge so we know all merges are done before we start deleting:
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ForceMergeResponse r = client().admin().indices().prepareForceMerge().setMaxNumSegments(1).execute().actionGet();
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assertNoFailures(r);
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final RefreshStats refreshStats = shard.refreshStats();
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for (int i = 0; i < 100; i++) {
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client().prepareDelete("index", "_doc", Integer.toString(i)).get();
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}
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// need to assert busily as IndexingMemoryController refreshes in background
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assertBusy(() -> assertThat(shard.refreshStats().getTotal(), greaterThan(refreshStats.getTotal() + 1)));
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}
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}
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@ -18,26 +18,24 @@
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*/
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package org.elasticsearch.indices;
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import org.apache.lucene.index.DirectoryReader;
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import org.apache.lucene.search.ReferenceManager;
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import org.apache.lucene.util.SetOnce;
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import org.elasticsearch.Version;
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import org.elasticsearch.action.admin.indices.forcemerge.ForceMergeResponse;
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import org.elasticsearch.cluster.node.DiscoveryNode;
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import org.elasticsearch.cluster.routing.ShardRouting;
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import org.elasticsearch.common.CheckedFunction;
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import org.elasticsearch.common.settings.Settings;
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import org.elasticsearch.common.unit.ByteSizeUnit;
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import org.elasticsearch.common.unit.ByteSizeValue;
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import org.elasticsearch.common.xcontent.XContentType;
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import org.elasticsearch.index.IndexService;
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import org.elasticsearch.index.engine.Engine;
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import org.elasticsearch.index.codec.CodecService;
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import org.elasticsearch.index.engine.EngineConfig;
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import org.elasticsearch.index.engine.InternalEngine;
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import org.elasticsearch.index.refresh.RefreshStats;
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import org.elasticsearch.index.shard.IndexShard;
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import org.elasticsearch.index.shard.IndexShardIT;
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import org.elasticsearch.index.shard.IndexShardTestCase;
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import org.elasticsearch.indices.breaker.NoneCircuitBreakerService;
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import org.elasticsearch.indices.recovery.RecoveryState;
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import org.elasticsearch.test.ESSingleNodeTestCase;
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import org.elasticsearch.threadpool.Scheduler.Cancellable;
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import org.elasticsearch.threadpool.ThreadPool;
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import org.elasticsearch.threadpool.ThreadPoolStats;
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import java.io.IOException;
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import java.util.ArrayList;
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@ -47,15 +45,16 @@ import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.atomic.AtomicReference;
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import static java.util.Collections.emptyMap;
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import static java.util.Collections.emptySet;
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import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
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import static org.hamcrest.Matchers.equalTo;
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import static org.hamcrest.Matchers.greaterThanOrEqualTo;
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public class IndexingMemoryControllerTests extends ESSingleNodeTestCase {
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public class IndexingMemoryControllerTests extends IndexShardTestCase {
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static class MockController extends IndexingMemoryController {
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@ -168,19 +167,16 @@ public class IndexingMemoryControllerTests extends ESSingleNodeTestCase {
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}
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}
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public void testShardAdditionAndRemoval() {
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createIndex("test", Settings.builder().put("index.number_of_shards", 3).put("index.number_of_replicas", 0).build());
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IndicesService indicesService = getInstanceFromNode(IndicesService.class);
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IndexService test = indicesService.indexService(resolveIndex("test"));
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public void testShardAdditionAndRemoval() throws IOException {
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MockController controller = new MockController(Settings.builder()
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.put("indices.memory.index_buffer_size", "4mb").build());
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IndexShard shard0 = test.getShard(0);
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IndexShard shard0 = newStartedShard();
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controller.simulateIndexing(shard0);
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controller.assertBuffer(shard0, 1);
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// add another shard
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IndexShard shard1 = test.getShard(1);
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IndexShard shard1 = newStartedShard();
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controller.simulateIndexing(shard1);
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controller.assertBuffer(shard0, 1);
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controller.assertBuffer(shard1, 1);
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@ -195,24 +191,21 @@ public class IndexingMemoryControllerTests extends ESSingleNodeTestCase {
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controller.forceCheck();
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// add a new one
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IndexShard shard2 = test.getShard(2);
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IndexShard shard2 = newStartedShard();
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controller.simulateIndexing(shard2);
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controller.assertBuffer(shard2, 1);
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closeShards(shard0, shard1, shard2);
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}
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public void testActiveInactive() {
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createIndex("test", Settings.builder().put("index.number_of_shards", 2).put("index.number_of_replicas", 0).build());
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IndicesService indicesService = getInstanceFromNode(IndicesService.class);
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IndexService test = indicesService.indexService(resolveIndex("test"));
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public void testActiveInactive() throws IOException {
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MockController controller = new MockController(Settings.builder()
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.put("indices.memory.index_buffer_size", "5mb")
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.build());
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IndexShard shard0 = test.getShard(0);
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IndexShard shard0 = newStartedShard();
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controller.simulateIndexing(shard0);
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IndexShard shard1 = test.getShard(1);
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IndexShard shard1 = newStartedShard();
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controller.simulateIndexing(shard1);
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controller.assertBuffer(shard0, 1);
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@ -237,6 +230,7 @@ public class IndexingMemoryControllerTests extends ESSingleNodeTestCase {
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controller.simulateIndexing(shard1);
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// shard1 crossed 5 mb and is now cleared:
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controller.assertBuffer(shard1, 0);
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closeShards(shard0, shard1);
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}
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public void testMinBufferSizes() {
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@ -288,14 +282,11 @@ public class IndexingMemoryControllerTests extends ESSingleNodeTestCase {
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}
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public void testThrottling() throws Exception {
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createIndex("test", Settings.builder().put("index.number_of_shards", 3).put("index.number_of_replicas", 0).build());
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IndicesService indicesService = getInstanceFromNode(IndicesService.class);
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IndexService test = indicesService.indexService(resolveIndex("test"));
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MockController controller = new MockController(Settings.builder()
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.put("indices.memory.index_buffer_size", "4mb").build());
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IndexShard shard0 = test.getShard(0);
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IndexShard shard1 = test.getShard(1);
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IndexShard shard0 = newStartedShard();
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IndexShard shard1 = newStartedShard();
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controller.simulateIndexing(shard0);
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controller.simulateIndexing(shard0);
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controller.simulateIndexing(shard0);
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@ -346,95 +337,21 @@ public class IndexingMemoryControllerTests extends ESSingleNodeTestCase {
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controller.forceCheck();
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controller.assertNotThrottled(shard0);
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controller.assertNotThrottled(shard1);
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}
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// #10312
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public void testDeletesAloneCanTriggerRefresh() throws Exception {
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createIndex("index",
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Settings.builder().put("index.number_of_shards", 1)
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.put("index.number_of_replicas", 0)
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.put("index.refresh_interval", -1)
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.build());
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ensureGreen();
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IndicesService indicesService = getInstanceFromNode(IndicesService.class);
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IndexService indexService = indicesService.indexService(resolveIndex("index"));
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IndexShard shard = indexService.getShardOrNull(0);
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assertNotNull(shard);
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for (int i = 0; i < 100; i++) {
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String id = Integer.toString(i);
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client().prepareIndex("index", "type", id).setSource("field", "value").get();
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}
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// Force merge so we know all merges are done before we start deleting:
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ForceMergeResponse r = client().admin().indices().prepareForceMerge().setMaxNumSegments(1).execute().actionGet();
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assertNoFailures(r);
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// Make a shell of an IMC to check up on indexing buffer usage:
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Settings settings = Settings.builder().put("indices.memory.index_buffer_size", "1kb").build();
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// TODO: would be cleaner if I could pass this 1kb setting to the single node this test created....
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IndexingMemoryController imc = new IndexingMemoryController(settings, null, null) {
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@Override
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protected List<IndexShard> availableShards() {
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return Collections.singletonList(shard);
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}
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@Override
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protected long getIndexBufferRAMBytesUsed(IndexShard shard) {
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return shard.getIndexBufferRAMBytesUsed();
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}
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@Override
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protected void writeIndexingBufferAsync(IndexShard shard) {
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// just do it sync'd for this test
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shard.writeIndexingBuffer();
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}
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@Override
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protected Cancellable scheduleTask(ThreadPool threadPool) {
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return null;
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}
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};
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for (int i = 0; i < 100; i++) {
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String id = Integer.toString(i);
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client().prepareDelete("index", "type", id).get();
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}
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final long indexingBufferBytes1 = shard.getIndexBufferRAMBytesUsed();
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imc.forceCheck();
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// We must assertBusy because the writeIndexingBufferAsync is done in background (REFRESH) thread pool:
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assertBusy(() -> {
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try (Engine.Searcher s2 = shard.acquireSearcher("index")) {
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// 100 buffered deletes will easily exceed our 1 KB indexing buffer so it should trigger a write:
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final long indexingBufferBytes2 = shard.getIndexBufferRAMBytesUsed();
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assertTrue(indexingBufferBytes2 < indexingBufferBytes1);
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}
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});
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closeShards(shard0, shard1);
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}
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public void testTranslogRecoveryWorksWithIMC() throws IOException {
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createIndex("test");
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ensureGreen();
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IndicesService indicesService = getInstanceFromNode(IndicesService.class);
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IndexService indexService = indicesService.indexService(resolveIndex("test"));
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IndexShard shard = indexService.getShardOrNull(0);
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IndexShard shard = newStartedShard(true);
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for (int i = 0; i < 100; i++) {
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client().prepareIndex("test", "test", Integer.toString(i)).setSource("{\"foo\" : \"bar\"}", XContentType.JSON).get();
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indexDoc(shard, "_doc", Integer.toString(i), "{\"foo\" : \"bar\"}", XContentType.JSON, null);
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}
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CheckedFunction<DirectoryReader, DirectoryReader, IOException> wrapper = directoryReader -> directoryReader;
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shard.close("simon says", false);
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AtomicReference<IndexShard> shardRef = new AtomicReference<>();
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Settings settings = Settings.builder().put("indices.memory.index_buffer_size", "50kb").build();
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Iterable<IndexShard> iterable = () -> (shardRef.get() == null) ? Collections.<IndexShard>emptyList().iterator()
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Iterable<IndexShard> iterable = () -> (shardRef.get() == null) ? Collections.emptyIterator()
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: Collections.singleton(shardRef.get()).iterator();
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AtomicInteger flushes = new AtomicInteger();
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IndexingMemoryController imc = new IndexingMemoryController(settings, client().threadPool(), iterable) {
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IndexingMemoryController imc = new IndexingMemoryController(settings, threadPool, iterable) {
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@Override
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protected void writeIndexingBufferAsync(IndexShard shard) {
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assertEquals(shard, shardRef.get());
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@ -442,21 +359,94 @@ public class IndexingMemoryControllerTests extends ESSingleNodeTestCase {
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shard.writeIndexingBuffer();
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}
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};
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final IndexShard newShard = IndexShardIT.newIndexShard(indexService, shard, wrapper, new NoneCircuitBreakerService(), imc);
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shardRef.set(newShard);
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try {
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assertEquals(0, imc.availableShards().size());
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ShardRouting routing = newShard.routingEntry();
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DiscoveryNode localNode = new DiscoveryNode("foo", buildNewFakeTransportAddress(), emptyMap(), emptySet(), Version.CURRENT);
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newShard.markAsRecovering("store", new RecoveryState(routing, localNode, null));
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shard = reinitShard(shard, imc);
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shardRef.set(shard);
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assertEquals(0, imc.availableShards().size());
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DiscoveryNode localNode = new DiscoveryNode("foo", buildNewFakeTransportAddress(), emptyMap(), emptySet(), Version.CURRENT);
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shard.markAsRecovering("store", new RecoveryState(shard.routingEntry(), localNode, null));
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assertEquals(1, imc.availableShards().size());
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assertTrue(IndexShardTestCase.recoverFromStore(newShard));
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assertTrue("we should have flushed in IMC at least once but did: " + flushes.get(), flushes.get() >= 1);
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IndexShardTestCase.updateRoutingEntry(newShard, routing.moveToStarted());
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} finally {
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newShard.close("simon says", false);
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}
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assertEquals(1, imc.availableShards().size());
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assertTrue(recoverFromStore(shard));
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assertThat("we should have flushed in IMC at least once", flushes.get(), greaterThanOrEqualTo(1));
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closeShards(shard);
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}
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EngineConfig configWithRefreshListener(EngineConfig config, ReferenceManager.RefreshListener listener) {
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final List<ReferenceManager.RefreshListener> internalRefreshListener = new ArrayList<>(config.getInternalRefreshListener());;
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internalRefreshListener.add(listener);
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return new EngineConfig(config.getShardId(), config.getAllocationId(), config.getThreadPool(),
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config.getIndexSettings(), config.getWarmer(), config.getStore(), config.getMergePolicy(), config.getAnalyzer(),
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config.getSimilarity(), new CodecService(null, logger), config.getEventListener(), config.getQueryCache(),
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config.getQueryCachingPolicy(), config.getTranslogConfig(), config.getFlushMergesAfter(),
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config.getExternalRefreshListener(), internalRefreshListener, config.getIndexSort(),
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config.getCircuitBreakerService(), config.getGlobalCheckpointSupplier(), config.retentionLeasesSupplier(),
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config.getPrimaryTermSupplier(), config.getTombstoneDocSupplier());
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}
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ThreadPoolStats.Stats getRefreshThreadPoolStats() {
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final ThreadPoolStats stats = threadPool.stats();
|
||||
for (ThreadPoolStats.Stats s : stats) {
|
||||
if (s.getName().equals(ThreadPool.Names.REFRESH)) {
|
||||
return s;
|
||||
}
|
||||
}
|
||||
throw new AssertionError("refresh thread pool stats not found [" + stats + "]");
|
||||
}
|
||||
|
||||
public void testSkipRefreshIfShardIsRefreshingAlready() throws Exception {
|
||||
SetOnce<CountDownLatch> refreshLatch = new SetOnce<>();
|
||||
ReferenceManager.RefreshListener refreshListener = new ReferenceManager.RefreshListener() {
|
||||
@Override
|
||||
public void beforeRefresh() {
|
||||
if (refreshLatch.get() != null) {
|
||||
try {
|
||||
refreshLatch.get().await();
|
||||
} catch (InterruptedException e) {
|
||||
throw new AssertionError(e);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public void afterRefresh(boolean didRefresh) {
|
||||
|
||||
}
|
||||
};
|
||||
IndexShard shard = newStartedShard(randomBoolean(), Settings.EMPTY,
|
||||
config -> new InternalEngine(configWithRefreshListener(config, refreshListener)));
|
||||
refreshLatch.set(new CountDownLatch(1)); // block refresh
|
||||
final RefreshStats refreshStats = shard.refreshStats();
|
||||
final IndexingMemoryController controller = new IndexingMemoryController(
|
||||
Settings.builder().put("indices.memory.interval", "200h") // disable it
|
||||
.put("indices.memory.index_buffer_size", "1024b").build(),
|
||||
threadPool,
|
||||
Collections.singleton(shard)) {
|
||||
@Override
|
||||
protected long getIndexBufferRAMBytesUsed(IndexShard shard) {
|
||||
return randomLongBetween(1025, 10 * 1024 * 1024);
|
||||
}
|
||||
|
||||
@Override
|
||||
protected long getShardWritingBytes(IndexShard shard) {
|
||||
return 0L;
|
||||
}
|
||||
};
|
||||
int iterations = randomIntBetween(10, 100);
|
||||
for (int i = 0; i < iterations; i++) {
|
||||
controller.forceCheck();
|
||||
}
|
||||
assertBusy(() -> {
|
||||
ThreadPoolStats.Stats stats = getRefreshThreadPoolStats();
|
||||
assertThat(stats.getQueue(), equalTo(0));
|
||||
assertThat(stats.getActive(), equalTo(1));
|
||||
});
|
||||
refreshLatch.get().countDown(); // allow refresh
|
||||
assertBusy(() -> {
|
||||
ThreadPoolStats.Stats stats = getRefreshThreadPoolStats();
|
||||
assertThat(stats.getQueue(), equalTo(0));
|
||||
assertThat(stats.getActive(), equalTo(0));
|
||||
});
|
||||
assertThat(shard.refreshStats().getTotal(), equalTo(refreshStats.getTotal() + 1));
|
||||
closeShards(shard);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue