HDDS-1341. TestContainerReplication#testContainerReplication fails intermittently. Contributed by Elek, Marton. (#862)

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/statemachine/DatanodeStateMachine.java

@@ -481,4 +481,9 @@ public long getCommandHandled() {
   public CommandDispatcher getCommandDispatcher() {
     return commandDispatcher;
   }
+
+  @VisibleForTesting
+  public ReplicationSupervisor getSupervisor() {
+    return supervisor;
+  }
 }

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/volume/HddsVolume.java

@@ -18,9 +18,10 @@
 
 package org.apache.hadoop.ozone.container.common.volume;
 
+import javax.annotation.Nullable;
+
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
-import com.sun.istack.Nullable;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.GetSpaceUsed;
 import org.apache.hadoop.fs.StorageType;

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/replication/ReplicationSupervisor.java

@@ -22,6 +22,7 @@
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
 
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import org.apache.hadoop.ozone.container.common.impl.ContainerSet;
@@ -42,6 +43,7 @@ public class ReplicationSupervisor {
   private final ContainerSet containerSet;
   private final ContainerReplicator replicator;
   private final ThreadPoolExecutor executor;
+  private final AtomicLong replicationCounter;
 
   /**
    * A set of container IDs that are currently being downloaded
@@ -56,6 +58,7 @@ public ReplicationSupervisor(
     this.containerSet = containerSet;
     this.replicator = replicator;
     this.containersInFlight = ConcurrentHashMap.newKeySet();
+    replicationCounter = new AtomicLong();
     this.executor = new ThreadPoolExecutor(
         0, poolSize, 60, TimeUnit.SECONDS,
         new LinkedBlockingQueue<>(),
@@ -123,7 +126,12 @@ public void run() {
         }
       } finally {
         containersInFlight.remove(task.getContainerId());
+        replicationCounter.incrementAndGet();
       }
     }
   }
+
+  public long getReplicationCounter() {
+    return replicationCounter.get();
+  }
 }

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/container/TestContainerReplication.java

@@ -41,11 +41,13 @@
 import org.apache.hadoop.ozone.MiniOzoneCluster;
 import org.apache.hadoop.ozone.container.common.helpers.BlockData;
 import org.apache.hadoop.ozone.container.common.interfaces.Container;
+import org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine;
 import org.apache.hadoop.ozone.container.keyvalue.KeyValueContainerData;
 import org.apache.hadoop.ozone.container.keyvalue.KeyValueHandler;
 import org.apache.hadoop.ozone.container.ozoneimpl.OzoneContainer;
 import org.apache.hadoop.ozone.container.ozoneimpl.TestOzoneContainer;
 import org.apache.hadoop.ozone.protocol.commands.ReplicateContainerCommand;
+import org.apache.hadoop.test.GenericTestUtils;
 
 import static org.apache.hadoop.ozone.container.ozoneimpl.TestOzoneContainer
     .writeChunkForContainer;
@@ -123,10 +125,16 @@ public void testContainerReplication() throws Exception {
             new ReplicateContainerCommand(containerId,
                 sourcePipelines.getNodes()));
 
-    Thread.sleep(3000);
+    DatanodeStateMachine destinationDatanodeDatanodeStateMachine =
+        destinationDatanode.getDatanodeStateMachine();
+
+    //wait for the replication
+    GenericTestUtils.waitFor(()
+        -> destinationDatanodeDatanodeStateMachine.getSupervisor()
+        .getReplicationCounter() > 0, 1000, 20_000);
 
     OzoneContainer ozoneContainer =
-        destinationDatanode.getDatanodeStateMachine().getContainer();
+        destinationDatanodeDatanodeStateMachine.getContainer();