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[hotfix][coordination] Wire ZooKeeperJobGraphStore to the new interface
We introduce three specific composition implementations for ZooKeeper, ZooKeeperJobGraphStoreWatcher, ZooKeeperJobGraphStoreEventHandler, ZooKeeperJobGraphStoreUtil. * ZooKeeperJobGraphStoreWatcher is a watcher on JobGraphStore. It could monitor all the changes on the job graph store and notify the DefaultJobGraphStore via JobGraphStore.JobGraphListener. * ZooKeeperJobGraphStoreUtil is a utility class which could convert a ZooKeeper path to JobId, or vice versa.
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flink-runtime/src/main/java/org/apache/flink/runtime/jobmanager/ZooKeeperJobGraphStore.java
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...runtime/src/main/java/org/apache/flink/runtime/jobmanager/ZooKeeperJobGraphStoreUtil.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.runtime.jobmanager; | ||
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| import org.apache.flink.api.common.JobID; | ||
| import org.apache.flink.runtime.util.ZooKeeperUtils; | ||
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| /** | ||
| * Singleton {@link JobGraphStoreUtil} implementation for ZooKeeper. | ||
| */ | ||
| public enum ZooKeeperJobGraphStoreUtil implements JobGraphStoreUtil { | ||
| INSTANCE; | ||
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| @Override | ||
| public String jobIDToName(JobID jobId) { | ||
| return ZooKeeperUtils.getPathForJob(jobId); | ||
| } | ||
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| @Override | ||
| public JobID nameToJobID(String name) { | ||
| return JobID.fromHexString(name); | ||
| } | ||
| } |
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...time/src/main/java/org/apache/flink/runtime/jobmanager/ZooKeeperJobGraphStoreWatcher.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.runtime.jobmanager; | ||
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| import org.apache.flink.api.common.JobID; | ||
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| import org.apache.flink.shaded.curator4.org.apache.curator.framework.CuratorFramework; | ||
| import org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.cache.PathChildrenCache; | ||
| import org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent; | ||
| import org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.cache.PathChildrenCacheListener; | ||
| import org.apache.flink.shaded.curator4.org.apache.curator.utils.ZKPaths; | ||
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| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import static org.apache.flink.util.Preconditions.checkNotNull; | ||
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| /** | ||
| * {@link JobGraphStoreWatcher} implementation for ZooKeeper. | ||
| * | ||
| * <p>Each job graph creates ZNode: | ||
| * <pre> | ||
| * +----O /flink/jobgraphs/<job-id> 1 [persistent] | ||
| * . | ||
| * . | ||
| * . | ||
| * +----O /flink/jobgraphs/<job-id> N [persistent] | ||
| * </pre> | ||
| * | ||
| * <p>The root path is watched to detect concurrent modifications in corner situations where | ||
| * multiple instances operate concurrently. The job manager acts as a {@link JobGraphStore.JobGraphListener} | ||
| * to react to such situations. | ||
| */ | ||
| public class ZooKeeperJobGraphStoreWatcher implements JobGraphStoreWatcher { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(ZooKeeperJobGraphStoreWatcher.class); | ||
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| /** | ||
| * Cache to monitor all children. This is used to detect races with other instances working | ||
| * on the same state. | ||
| */ | ||
| private final PathChildrenCache pathCache; | ||
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| private JobGraphStore.JobGraphListener jobGraphListener; | ||
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| private volatile boolean running; | ||
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| public ZooKeeperJobGraphStoreWatcher(PathChildrenCache pathCache) { | ||
| this.pathCache = checkNotNull(pathCache); | ||
| this.pathCache.getListenable().addListener(new JobGraphsPathCacheListener()); | ||
| running = false; | ||
| } | ||
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| @Override | ||
| public void start(JobGraphStore.JobGraphListener jobGraphListener) throws Exception { | ||
| this.jobGraphListener = checkNotNull(jobGraphListener); | ||
| running = true; | ||
| pathCache.start(); | ||
| } | ||
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| @Override | ||
| public void stop() throws Exception { | ||
| if (!running) { | ||
| return; | ||
| } | ||
| running = false; | ||
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| LOG.info("Stopping ZooKeeperJobGraphStoreWatcher "); | ||
| pathCache.close(); | ||
| } | ||
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| /** | ||
| * Monitors ZooKeeper for changes. | ||
| * | ||
| * <p>Detects modifications from other job managers in corner situations. The event | ||
| * notifications fire for changes from this job manager as well. | ||
| */ | ||
| private final class JobGraphsPathCacheListener implements PathChildrenCacheListener { | ||
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| @Override | ||
| public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) { | ||
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| if (LOG.isDebugEnabled()) { | ||
| if (event.getData() != null) { | ||
| LOG.debug("Received {} event (path: {})", event.getType(), event.getData().getPath()); | ||
| } | ||
| else { | ||
| LOG.debug("Received {} event", event.getType()); | ||
| } | ||
| } | ||
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| switch (event.getType()) { | ||
| case CHILD_ADDED: { | ||
| JobID jobId = fromEvent(event); | ||
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| LOG.debug("Received CHILD_ADDED event notification for job {}", jobId); | ||
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| jobGraphListener.onAddedJobGraph(jobId); | ||
| } | ||
| break; | ||
|
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| case CHILD_UPDATED: { | ||
| // Nothing to do | ||
| } | ||
| break; | ||
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| case CHILD_REMOVED: { | ||
| JobID jobId = fromEvent(event); | ||
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| LOG.debug("Received CHILD_REMOVED event notification for job {}", jobId); | ||
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| jobGraphListener.onRemovedJobGraph(jobId); | ||
| } | ||
| break; | ||
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| case CONNECTION_SUSPENDED: { | ||
| LOG.warn("ZooKeeper connection SUSPENDING. Changes to the submitted job " + | ||
| "graphs are not monitored (temporarily)."); | ||
| } | ||
| break; | ||
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| case CONNECTION_LOST: { | ||
| LOG.warn("ZooKeeper connection LOST. Changes to the submitted job " + | ||
| "graphs are not monitored (permanently)."); | ||
| } | ||
| break; | ||
|
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| case CONNECTION_RECONNECTED: { | ||
| LOG.info("ZooKeeper connection RECONNECTED. Changes to the submitted job " + | ||
| "graphs are monitored again."); | ||
| } | ||
| break; | ||
|
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| case INITIALIZED: { | ||
| LOG.info("JobGraphsPathCacheListener initialized"); | ||
| } | ||
| break; | ||
| } | ||
| } | ||
|
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| /** | ||
| * Returns a JobID for the event's path. | ||
| */ | ||
| private JobID fromEvent(PathChildrenCacheEvent event) { | ||
| return JobID.fromHexString(ZKPaths.getNodeFromPath(event.getData().getPath())); | ||
| } | ||
| } | ||
| } |
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