leventov commented on a change in pull request #7088: Improve parallelism of zookeeper based segment change processing URL: https://github.com/apache/incubator-druid/pull/7088#discussion_r259541024
########## File path: server/src/main/java/org/apache/druid/server/coordinator/CuratorLoadQueuePeonV2.java ########## @@ -0,0 +1,418 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF 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.apache.druid.server.coordinator; + +import com.fasterxml.jackson.annotation.JsonProperty; +import com.fasterxml.jackson.databind.ObjectMapper; +import com.google.common.collect.ImmutableList; +import com.google.common.util.concurrent.ThreadFactoryBuilder; +import org.apache.curator.framework.CuratorFramework; +import org.apache.curator.framework.api.CuratorWatcher; +import org.apache.curator.utils.ZKPaths; +import org.apache.druid.java.util.common.ISE; +import org.apache.druid.java.util.emitter.EmittingLogger; +import org.apache.druid.server.coordination.DataSegmentChangeRequest; +import org.apache.druid.server.coordination.SegmentChangeRequestDrop; +import org.apache.druid.server.coordination.SegmentChangeRequestLoad; +import org.apache.druid.server.coordination.SegmentChangeRequestNoop; +import org.apache.druid.timeline.DataSegment; +import org.apache.druid.timeline.SegmentId; +import org.apache.zookeeper.CreateMode; +import org.apache.zookeeper.data.Stat; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.List; +import java.util.Set; +import java.util.concurrent.Callable; +import java.util.concurrent.ConcurrentSkipListMap; +import java.util.concurrent.ConcurrentSkipListSet; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.ThreadLocalRandom; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.concurrent.atomic.AtomicLong; + +/** + * Use {@link HttpLoadQueuePeon} instead. + */ +@Deprecated +public class CuratorLoadQueuePeonV2 extends LoadQueuePeon +{ + private static final EmittingLogger log = new EmittingLogger(CuratorLoadQueuePeon.class); + private static final int DROP = 0; + private static final int LOAD = 1; + private final CuratorFramework curator; + private final String basePath; + private final ObjectMapper jsonMapper; + private final ExecutorService processingExecutor; + private final ScheduledExecutorService checkNodeRemovedExecutor; + private final ExecutorService callBackExecutor; + private final DruidCoordinatorConfig config; + + private final AtomicLong queuedSize = new AtomicLong(0); + private final AtomicInteger failedAssignCount = new AtomicInteger(0); + + private final ConcurrentSkipListMap<DataSegment, SegmentHolder> segmentsToLoad = new ConcurrentSkipListMap<>( + DruidCoordinator.SEGMENT_COMPARATOR + ); + private final ConcurrentSkipListMap<DataSegment, SegmentHolder> segmentsToDrop = new ConcurrentSkipListMap<>( + DruidCoordinator.SEGMENT_COMPARATOR + ); + private final ConcurrentSkipListSet<DataSegment> segmentsMarkedToDrop = new ConcurrentSkipListSet<>( + DruidCoordinator.SEGMENT_COMPARATOR + ); + + private static final int MAX_TASK_WAIT = 100; + + CuratorLoadQueuePeonV2( + CuratorFramework curator, + String basePath, + ObjectMapper jsonMapper, + ExecutorService processingExecutor, + ExecutorService callbackExecutor, + DruidCoordinatorConfig config + ) + { + this.curator = curator; + this.basePath = basePath; + this.jsonMapper = jsonMapper; + this.callBackExecutor = callbackExecutor; + this.processingExecutor = processingExecutor; + this.config = config; + //TODO: samarth configure the size of this pool + this.checkNodeRemovedExecutor = Executors.newScheduledThreadPool(5, new ThreadFactoryBuilder().setNameFormat( + "ZKNodeDeletionChecker--%d").build()); + } + + @JsonProperty + @Override + public Set<DataSegment> getSegmentsToLoad() + { + return segmentsToLoad.keySet(); + } + + @JsonProperty + @Override + public Set<DataSegment> getSegmentsToDrop() + { + return segmentsToDrop.keySet(); + } + + @JsonProperty + @Override + public Set<DataSegment> getSegmentsMarkedToDrop() + { + return segmentsMarkedToDrop; + } + + @Override + public long getLoadQueueSize() + { + return queuedSize.get(); + } + + @Override + public int getAndResetFailedAssignCount() + { + return failedAssignCount.getAndSet(0); + } + + @Override + public int getNumberOfSegmentsInQueue() + { + return segmentsToLoad.size(); + } + + @Override + public void loadSegment( + final DataSegment segment, + final LoadPeonCallback callback + ) + { + + final SegmentHolder existingHolder = segmentsToLoad.get(segment); + if (existingHolder != null) { + if ((callback != null)) { + existingHolder.addCallback(callback); + } + return; + } + log.info("Asking server peon[%s] to load segment[%s]", basePath, segment.getId()); + queuedSize.addAndGet(segment.getSize()); + SegmentHolder holder = new SegmentHolder(segment, LOAD, Collections.singletonList(callback)); + segmentsToLoad.put(segment, holder); + processingExecutor.submit((Callable<Void>) () -> { + processSegmentChangeRequest(holder); + return null; + }); + } + + @Override + public void dropSegment( + final DataSegment segment, + final LoadPeonCallback callback + ) + { + final SegmentHolder existingHolder = segmentsToDrop.get(segment); + if (existingHolder != null) { + if (callback != null) { + existingHolder.addCallback(callback); + } + return; + } + log.info("Asking server peon[%s] to drop segment[%s]", basePath, segment.getId()); + SegmentHolder segmentHolder = new SegmentHolder(segment, DROP, Collections.singletonList(callback)); + segmentsToDrop.put(segment, segmentHolder); + processingExecutor.submit((Callable<Void>) () -> { + processSegmentChangeRequest(segmentHolder); + return null; + }); + } + + @Override + public void markSegmentToDrop(DataSegment dataSegment) + { + segmentsMarkedToDrop.add(dataSegment); + } + + @Override + public void unmarkSegmentToDrop(DataSegment dataSegment) + { + segmentsMarkedToDrop.remove(dataSegment); + } + + private void processSegmentChangeRequest(SegmentHolder segmentHolder) + { + try { + // Wait for a random duration since we do not want zookeeper getting pounded with create node requests + TimeUnit.MILLISECONDS.sleep(ThreadLocalRandom.current().nextInt(MAX_TASK_WAIT)); + log.info("Server[%s] %s [%s]", basePath, segmentHolder.getType() == LOAD ? Review comment: This is not aligned with the Druid code style (all args fit the line _or_ each arg is broken down on its own line). Please don't use multiline ternary operator. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
