Github user StephanEwen commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5654#discussion_r172972943
  
    --- Diff: 
flink-tests/src/test/java/org/apache/flink/test/checkpointing/ZooKeeperHighAvailabilityITCase.java
 ---
    @@ -0,0 +1,387 @@
    +/*
    + * 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.FilterFunction;
    +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.typeutils.base.StringSerializer;
    +import org.apache.flink.api.java.functions.KeySelector;
    +import org.apache.flink.configuration.ConfigConstants;
    +import org.apache.flink.configuration.Configuration;
    +import org.apache.flink.configuration.HighAvailabilityOptions;
    +import org.apache.flink.core.testutils.OneShotLatch;
    +import org.apache.flink.runtime.concurrent.ApplyFunction;
    +import org.apache.flink.runtime.concurrent.Future;
    +import org.apache.flink.runtime.concurrent.FutureUtils;
    +import org.apache.flink.runtime.concurrent.impl.FlinkFuture;
    +import org.apache.flink.runtime.instance.ActorGateway;
    +import org.apache.flink.runtime.jobgraph.JobGraph;
    +import org.apache.flink.runtime.jobgraph.JobStatus;
    +import org.apache.flink.runtime.messages.JobManagerMessages;
    +import org.apache.flink.runtime.minicluster.LocalFlinkMiniCluster;
    +import org.apache.flink.runtime.state.FunctionInitializationContext;
    +import org.apache.flink.runtime.state.FunctionSnapshotContext;
    +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.TestBaseUtils;
    +import org.apache.flink.util.Preconditions;
    +
    +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.util.UUID;
    +import java.util.concurrent.Callable;
    +import java.util.concurrent.TimeUnit;
    +import java.util.concurrent.atomic.AtomicBoolean;
    +import java.util.concurrent.atomic.AtomicInteger;
    +
    +import scala.concurrent.Await;
    +import scala.concurrent.duration.Deadline;
    +import scala.concurrent.duration.FiniteDuration;
    +
    +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 TestBaseUtils {
    +
    +   private static final FiniteDuration TEST_TIMEOUT = new 
FiniteDuration(5, TimeUnit.MINUTES);
    +
    +   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 LocalFlinkMiniCluster cluster = null;
    +
    +   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(ConfigConstants.TASK_MANAGER_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");
    +
    +           cluster = TestBaseUtils.startCluster(config, false);
    +   }
    +
    +   @AfterClass
    +   public static void tearDown() throws Exception {
    +           stopCluster(cluster, TestBaseUtils.DEFAULT_TIMEOUT);
    +
    +           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();
    +
    +           final Deadline deadline = TEST_TIMEOUT.fromNow();
    +
    +           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(new 
FsStateBackend(checkpointLocation.toURI()));
    +
    +           DataStreamSource<String> source = env.addSource(new 
UnboundedSource());
    +
    +           source
    +                   .keyBy(new KeySelector<String, String>() {
    +                           @Override
    +                           public String getKey(String value) {
    +                                   return value;
    +                           }
    +                   })
    +                   .map(new CheckpointBlockingFunction());
    +
    +           JobGraph jobGraph = env.getStreamGraph().getJobGraph();
    +           final JobID jobID = 
Preconditions.checkNotNull(jobGraph.getJobID());
    +
    +           // Retrieve the job manager
    +           final ActorGateway jobManager = 
Await.result(cluster.leaderGateway().future(), deadline.timeLeft());
    +
    +           cluster.submitJobDetached(jobGraph);
    +
    +           // 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++;
    +                   }
    +           }
    +           assertTrue(numCheckpoints > 0);
    +
    +           failInCheckpointLatch.trigger();
    +
    +           // Ensure that we see at least one cycle where the job tries to 
restart and fails.
    +           Future<JobStatus> jobStatusFuture = FutureUtils.retrySuccessful(
    +                   new Callable<Future<JobStatus>>() {
    +                           @Override
    +                           public Future<JobStatus> call(){
    +                                   return getJobStatus(jobManager, jobID, 
TEST_TIMEOUT);
    +                           }
    +                   },
    +                   new FilterFunction<JobStatus>() {
    +                           @Override
    +                           public boolean filter(JobStatus jobStatus){
    +                                   return jobStatus == 
JobStatus.RESTARTING;
    +                           }
    +                   },
    +                   deadline,
    +                   TestingUtils.defaultExecutor());
    +           assertEquals(JobStatus.RESTARTING, jobStatusFuture.get());
    +
    +           jobStatusFuture = FutureUtils.retrySuccessful(
    +                   new Callable<Future<JobStatus>>() {
    +                           @Override
    +                           public Future<JobStatus> call() {
    +                                   return getJobStatus(jobManager, jobID, 
TEST_TIMEOUT);
    +                           }
    +                   },
    +                   new FilterFunction<JobStatus>() {
    +                           @Override
    +                           public boolean filter(JobStatus jobStatus) {
    +                                   return jobStatus == JobStatus.FAILING;
    +                           }
    +                   },
    +                   deadline,
    +                   TestingUtils.defaultExecutor());
    +           assertEquals(JobStatus.FAILING, jobStatusFuture.get());
    +
    +           // move back the HA directory so that the job can restore
    +           CheckpointBlockingFunction.afterMessWithZooKeeper.set(true);
    +
    +           files = movedCheckpointLocation.listFiles();
    +           assertNotNull(files);
    +           for (File file : files) {
    +                   if (file.getName().startsWith("completedCheckpoint")) {
    +                           assertTrue(file.renameTo(new File(haStorageDir, 
file.getName())));
    +                   }
    +           }
    +
    +           // now the job should be able to go to RUNNING again and then 
eventually to FINISHED
    +           jobStatusFuture = FutureUtils.retrySuccessful(
    +                   new Callable<Future<JobStatus>>() {
    +                           @Override
    +                           public Future<JobStatus> call() {
    +                                   return getJobStatus(jobManager, jobID, 
TEST_TIMEOUT);
    +                           }
    +                   },
    +                   new FilterFunction<JobStatus>() {
    +                           @Override
    +                           public boolean filter(JobStatus jobStatus) {
    +                                   return jobStatus == JobStatus.FINISHED;
    +                           }
    +                   },
    +                   deadline,
    +                   TestingUtils.defaultExecutor());
    +           assertEquals(JobStatus.FINISHED, jobStatusFuture.get());
    +
    +           // make sure we saw a successful restore
    +           successfulRestoreLatch.await();
    +
    +           assertThat("We saw illegal restores.", 
CheckpointBlockingFunction.illegalRestores.get(), is(0));
    --- End diff --
    
    Or drop the `illegalRestores` - may not be necessary, see above. 


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