[
https://issues.apache.org/jira/browse/FLINK-8487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390205#comment-16390205
]
ASF GitHub Bot commented on FLINK-8487:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/5656#discussion_r172980021
--- Diff:
flink-tests/src/test/java/org/apache/flink/test/checkpointing/ZooKeeperHighAvailabilityITCase.java
---
@@ -0,0 +1,333 @@
+/*
+ * 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.flink.test.checkpointing;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.api.common.functions.RichMapFunction;
+import org.apache.flink.api.common.restartstrategy.RestartStrategies;
+import org.apache.flink.api.common.state.ValueStateDescriptor;
+import org.apache.flink.api.common.time.Deadline;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.api.common.typeutils.base.StringSerializer;
+import org.apache.flink.client.program.ClusterClient;
+import org.apache.flink.configuration.ConfigConstants;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.HighAvailabilityOptions;
+import org.apache.flink.configuration.TaskManagerOptions;
+import org.apache.flink.core.testutils.OneShotLatch;
+import org.apache.flink.runtime.concurrent.FutureUtils;
+import org.apache.flink.runtime.jobgraph.JobGraph;
+import org.apache.flink.runtime.jobgraph.JobStatus;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.runtime.state.FunctionSnapshotContext;
+import org.apache.flink.runtime.state.StateBackend;
+import org.apache.flink.runtime.state.filesystem.FsStateBackend;
+import org.apache.flink.runtime.testingUtils.TestingUtils;
+import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction;
+import org.apache.flink.streaming.api.datastream.DataStreamSource;
+import
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.streaming.api.functions.source.SourceFunction;
+import org.apache.flink.test.util.MiniClusterResource;
+import org.apache.flink.util.Preconditions;
+import org.apache.flink.util.TestLogger;
+
+import org.apache.curator.test.TestingServer;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+
+import java.io.File;
+import java.time.Duration;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Integration tests for {@link
org.apache.flink.runtime.checkpoint.ZooKeeperCompletedCheckpointStore}.
+ */
+public class ZooKeeperHighAvailabilityITCase extends TestLogger {
+
+ private static final Duration TEST_TIMEOUT = Duration.ofSeconds(10000L);
+
+ private static final int NUM_JMS = 1;
+ private static final int NUM_TMS = 1;
+ private static final int NUM_SLOTS_PER_TM = 1;
+
+ @ClassRule
+ public static final TemporaryFolder temporaryFolder = new
TemporaryFolder();
+
+ private static File haStorageDir;
+
+ private static TestingServer zkServer;
+
+ private static MiniClusterResource miniClusterResource;
+
+ private static OneShotLatch waitForCheckpointLatch = new OneShotLatch();
+ private static OneShotLatch failInCheckpointLatch = new OneShotLatch();
+ private static OneShotLatch successfulRestoreLatch = new OneShotLatch();
+
+ @BeforeClass
+ public static void setup() throws Exception {
+ zkServer = new TestingServer();
+
+ Configuration config = new Configuration();
+ config.setInteger(ConfigConstants.LOCAL_NUMBER_JOB_MANAGER,
NUM_JMS);
+ config.setInteger(ConfigConstants.LOCAL_NUMBER_TASK_MANAGER,
NUM_TMS);
+ config.setInteger(TaskManagerOptions.NUM_TASK_SLOTS,
NUM_SLOTS_PER_TM);
+
+ haStorageDir = temporaryFolder.newFolder();
+
+ config.setString(HighAvailabilityOptions.HA_STORAGE_PATH,
haStorageDir.toString());
+ config.setString(HighAvailabilityOptions.HA_CLUSTER_ID,
UUID.randomUUID().toString());
+ config.setString(HighAvailabilityOptions.HA_ZOOKEEPER_QUORUM,
zkServer.getConnectString());
+ config.setString(HighAvailabilityOptions.HA_MODE, "zookeeper");
+
+ // we have to manage this manually because we have to create
the ZooKeeper server
+ // ahead of this
+ miniClusterResource = new MiniClusterResource(
+ new
MiniClusterResource.MiniClusterResourceConfiguration(
+ config,
+ NUM_TMS,
+ NUM_SLOTS_PER_TM));
+
+ miniClusterResource.before();
+ }
+
+ @AfterClass
+ public static void tearDown() throws Exception {
+ miniClusterResource.after();
+
+ zkServer.stop();
+ zkServer.close();
+ }
+
+ /**
+ * Verify that we don't start a job from scratch if we cannot restore
any of the
+ * CompletedCheckpoints.
+ *
+ * <p>Synchronization for the different steps and things we want to
observe happens via
+ * latches in the test method and the methods of {@link
CheckpointBlockingFunction}.
+ *
+ * <p>The test follows these steps:
+ * <ol>
+ * <li>Start job and block on a latch until we have done some
checkpoints
+ * <li>Block in the special function
+ * <li>Move away the contents of the ZooKeeper HA directory to make
restoring from
+ * checkpoints impossible
+ * <li>Unblock the special function, which now induces a failure
+ * <li>Make sure that the job does not recover successfully
+ * <li>Move back the HA directory
+ * <li>Make sure that the job recovers, we use a latch to ensure
that the operator
+ * restored successfully
+ * </ol>
+ */
+ @Test(timeout = 120_000L)
+ public void testRestoreBehaviourWithFaultyStateHandles() throws
Exception {
+
CheckpointBlockingFunction.allowedInitializeCallsWithoutRestore.set(1);
+ CheckpointBlockingFunction.successfulRestores.set(0);
+ CheckpointBlockingFunction.illegalRestores.set(0);
+ CheckpointBlockingFunction.afterMessWithZooKeeper.set(false);
+ CheckpointBlockingFunction.failedAlready.set(false);
+
+ waitForCheckpointLatch = new OneShotLatch();
+ failInCheckpointLatch = new OneShotLatch();
+ successfulRestoreLatch = new OneShotLatch();
+
+ ClusterClient<?> clusterClient =
miniClusterResource.getClusterClient();
+ final Deadline deadline = Deadline.now().plus(TEST_TIMEOUT);
+
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ env.setParallelism(1);
+
env.setRestartStrategy(RestartStrategies.fixedDelayRestart(Integer.MAX_VALUE,
0));
+ env.enableCheckpointing(10); // Flink doesn't allow lower than
10 ms
+
+ File checkpointLocation = temporaryFolder.newFolder();
+ env.setStateBackend((StateBackend) new
FsStateBackend(checkpointLocation.toURI()));
+
+ DataStreamSource<String> source = env.addSource(new
UnboundedSource());
+
+ source
+ .keyBy((str) -> str)
+ .map(new CheckpointBlockingFunction());
+
+ JobGraph jobGraph = env.getStreamGraph().getJobGraph();
+ JobID jobID = Preconditions.checkNotNull(jobGraph.getJobID());
+
+ clusterClient.setDetached(true);
+ clusterClient.submitJob(jobGraph,
ZooKeeperHighAvailabilityITCase.class.getClassLoader());
+
+ // wait until we did some checkpoints
+ waitForCheckpointLatch.await();
+
+ // mess with the HA directory so that the job cannot restore
+ File movedCheckpointLocation = temporaryFolder.newFolder();
+ int numCheckpoints = 0;
+ File[] files = haStorageDir.listFiles();
+ assertNotNull(files);
+ for (File file : files) {
+ if (file.getName().startsWith("completedCheckpoint")) {
+ assertTrue(file.renameTo(new
File(movedCheckpointLocation, file.getName())));
+ numCheckpoints++;
+ }
+ }
+ // Note to future developers: This will break when we change
Flink to not put the
+ // checkpoint metadata into the HA directory but instead rely
on the fact that the
+ // actual checkpoint directory on DFS contains the checkpoint
metadata. In this case,
+ // ZooKeeper will only contain a "handle" (read: String) that
points to the metadata
+ // in DFS. The likely solution will be that we have to go
directly to ZooKeeper, find
+ // out where the checkpoint is stored and mess with that.
--- End diff --
The solution would be to rename the checkpoint directory directly.
> State loss after multiple restart attempts
> ------------------------------------------
>
> Key: FLINK-8487
> URL: https://issues.apache.org/jira/browse/FLINK-8487
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.3.2
> Reporter: Fabian Hueske
> Priority: Blocker
> Fix For: 1.5.0, 1.4.3
>
>
> A user [reported this
> issue|https://lists.apache.org/thread.html/9dc9b719cf8449067ad01114fedb75d1beac7b4dff171acdcc24903d@%3Cuser.flink.apache.org%3E]
> on the user@f.a.o mailing list and analyzed the situation.
> Scenario:
> - A program that reads from Kafka and computes counts in a keyed 15 minute
> tumbling window. StateBackend is RocksDB and checkpointing is enabled.
> {code}
> keyBy(0)
> .timeWindow(Time.of(window_size, TimeUnit.MINUTES))
> .allowedLateness(Time.of(late_by, TimeUnit.SECONDS))
> .reduce(new ReduceFunction(), new WindowFunction())
> {code}
> - At some point HDFS went into a safe mode due to NameNode issues
> - The following exception was thrown
> {code}
> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException):
> Operation category WRITE is not supported in state standby. Visit
> https://s.apache.org/sbnn-error
> ..................
> at
> org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.mkdirs(HadoopFileSystem.java:453)
> at
> org.apache.flink.core.fs.SafetyNetWrapperFileSystem.mkdirs(SafetyNetWrapperFileSystem.java:111)
> at
> org.apache.flink.runtime.state.filesystem.FsCheckpointStreamFactory.createBasePath(FsCheckpointStreamFactory.java:132)
> {code}
> - The pipeline came back after a few restarts and checkpoint failures, after
> the HDFS issues were resolved.
> - It was evident that operator state was lost. Either it was the Kafka
> consumer that kept on advancing it's offset between a start and the next
> checkpoint failure (a minute's worth) or the the operator that had partial
> aggregates was lost.
> The user did some in-depth analysis (see [mail
> thread|https://lists.apache.org/thread.html/9dc9b719cf8449067ad01114fedb75d1beac7b4dff171acdcc24903d@%3Cuser.flink.apache.org%3E])
> and might have (according to [~aljoscha]) identified the problem.
> [~stefanrichte...@gmail.com], can you have a look at this issue and check if
> it is relevant?
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