HDFS-16460. [SPS]: Handle failure retries for moving tasks (#4001)

Author: tomscut

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -827,6 +827,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
       "dfs.storage.policy.satisfier.retry.max.attempts";
   public static final int DFS_STORAGE_POLICY_SATISFIER_MAX_RETRY_ATTEMPTS_DEFAULT =
       3;
+  public static final String DFS_STORAGE_POLICY_SATISFIER_MOVE_TASK_MAX_RETRY_ATTEMPTS_KEY =
+      "dfs.storage.policy.satisfier.move.task.retry.max.attempts";
+  public static final int DFS_STORAGE_POLICY_SATISFIER_MOVE_TASK_MAX_RETRY_ATTEMPTS_DEFAULT =
+      3;
   public static final String DFS_STORAGE_DEFAULT_POLICY =
       "dfs.storage.default.policy";
   public static final HdfsConstants.StoragePolicy

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/sps/BlockDispatcher.java

@@ -101,7 +101,7 @@ public BlockDispatcher(int sockTimeout, int ioFileBuffSize,
    */
   public BlockMovementStatus moveBlock(BlockMovingInfo blkMovingInfo,
       SaslDataTransferClient saslClient, ExtendedBlock eb, Socket sock,
-      DataEncryptionKeyFactory km, Token<BlockTokenIdentifier> accessToken) {
+      DataEncryptionKeyFactory km, Token<BlockTokenIdentifier> accessToken) throws IOException {
     LOG.info("Start moving block:{} from src:{} to destin:{} to satisfy "
         + "storageType, sourceStoragetype:{} and destinStoragetype:{}",
         blkMovingInfo.getBlock(), blkMovingInfo.getSource(),
@@ -149,14 +149,6 @@ public BlockMovementStatus moveBlock(BlockMovingInfo blkMovingInfo,
       LOG.debug("Pinned block can't be moved, so skipping block:{}",
           blkMovingInfo.getBlock(), e);
       return BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_SUCCESS;
-    } catch (IOException e) {
-      // TODO: handle failure retries
-      LOG.warn(
-          "Failed to move block:{} from src:{} to destin:{} to satisfy "
-              + "storageType:{}",
-          blkMovingInfo.getBlock(), blkMovingInfo.getSource(),
-          blkMovingInfo.getTarget(), blkMovingInfo.getTargetStorageType(), e);
-      return BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_FAILURE;
     } finally {
       IOUtils.closeStream(out);
       IOUtils.closeStream(in);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/sps/ExternalSPSBlockMoveTaskHandler.java

@@ -80,11 +80,15 @@ public class ExternalSPSBlockMoveTaskHandler implements BlockMoveTaskHandler {
   private Daemon movementTrackerThread;
   private final SPSService service;
   private final BlockDispatcher blkDispatcher;
+  private final int maxRetry;
 
   public ExternalSPSBlockMoveTaskHandler(Configuration conf,
       NameNodeConnector nnc, SPSService spsService) {
     int moverThreads = conf.getInt(DFSConfigKeys.DFS_MOVER_MOVERTHREADS_KEY,
         DFSConfigKeys.DFS_MOVER_MOVERTHREADS_DEFAULT);
+    maxRetry = conf.getInt(
+        DFSConfigKeys.DFS_STORAGE_POLICY_SATISFIER_MOVE_TASK_MAX_RETRY_ATTEMPTS_KEY,
+        DFSConfigKeys.DFS_STORAGE_POLICY_SATISFIER_MOVE_TASK_MAX_RETRY_ATTEMPTS_DEFAULT);
     moveExecutor = initializeBlockMoverThreadPool(moverThreads);
     mCompletionServ = new ExecutorCompletionService<>(moveExecutor);
     this.nnc = nnc;
@@ -151,7 +155,7 @@ public void submitMoveTask(BlockMovingInfo blkMovingInfo) throws IOException {
     // during block movement assignment logic. In the internal movement,
     // remaining space is bookkeeping at the DatanodeDescriptor, please refer
     // IntraSPSNameNodeBlockMoveTaskHandler#submitMoveTask implementation and
-    // updating via the funcation call -
+    // updating via the function call -
     // dn.incrementBlocksScheduled(blkMovingInfo.getTargetStorageType());
     LOG.debug("Received BlockMovingTask {}", blkMovingInfo);
     BlockMovingTask blockMovingTask = new BlockMovingTask(blkMovingInfo);
@@ -195,21 +199,25 @@ private BlockMovementStatus moveBlock() {
 
       final KeyManager km = nnc.getKeyManager();
       Token<BlockTokenIdentifier> accessToken;
-      try {
-        accessToken = km.getAccessToken(eb,
-            new StorageType[]{blkMovingInfo.getTargetStorageType()},
-            new String[0]);
-      } catch (IOException e) {
-        // TODO: handle failure retries
-        LOG.warn(
-            "Failed to move block:{} from src:{} to destin:{} to satisfy "
-                + "storageType:{}",
-            blkMovingInfo.getBlock(), blkMovingInfo.getSource(),
-            blkMovingInfo.getTarget(), blkMovingInfo.getTargetStorageType(), e);
-        return BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_FAILURE;
+      int retry = 0;
+      while (retry <= maxRetry) {
+        try {
+          ExternalSPSFaultInjector.getInstance().mockAnException(retry);
+          accessToken = km.getAccessToken(eb,
+              new StorageType[]{blkMovingInfo.getTargetStorageType()},
+              new String[0]);
+          return blkDispatcher.moveBlock(blkMovingInfo, saslClient, eb,
+              new Socket(), km, accessToken);
+        } catch (IOException e) {
+          LOG.warn(
+              "Failed to move block:{} from src:{} to dest:{} to satisfy "
+                  + "storageType:{}, retry: {}",
+              blkMovingInfo.getBlock(), blkMovingInfo.getSource(),
+              blkMovingInfo.getTarget(), blkMovingInfo.getTargetStorageType(), retry, e);
+          retry++;
+        }
       }
-      return blkDispatcher.moveBlock(blkMovingInfo, saslClient, eb,
-          new Socket(), km, accessToken);
+      return BlockMovementStatus.DN_BLK_STORAGE_MOVEMENT_FAILURE;
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/sps/ExternalSPSFaultInjector.java

@@ -0,0 +1,46 @@
+/**
+ * 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.hadoop.hdfs.server.sps;
+
+import org.apache.hadoop.classification.VisibleForTesting;
+
+import java.io.IOException;
+
+/**
+ * Used to inject certain faults for testing.
+ */
+public class ExternalSPSFaultInjector {
+  @VisibleForTesting
+  private static ExternalSPSFaultInjector instance =
+      new ExternalSPSFaultInjector();
+
+  @VisibleForTesting
+  public static ExternalSPSFaultInjector getInstance() {
+    return instance;
+  }
+
+  @VisibleForTesting
+  public static void setInstance(ExternalSPSFaultInjector instance) {
+    ExternalSPSFaultInjector.instance = instance;
+  }
+
+  @VisibleForTesting
+  public void mockAnException(int retry) throws IOException {
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

@@ -5507,6 +5507,14 @@
   </description>
 </property>
 
+<property>
+  <name>dfs.storage.policy.satisfier.move.task.retry.max.attempts</name>
+  <value>3</value>
+  <description>
+    Max retries for moving task to satisfy the block storage policy.
+  </description>
+</property>
+
 <property>
   <name>dfs.storage.policy.satisfier.datanode.cache.refresh.interval.ms</name>
   <value>300000</value>

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/sps/TestExternalStoragePolicySatisfier.java

@@ -33,6 +33,7 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_SPS_KEYTAB_FILE_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_SPS_MAX_OUTSTANDING_PATHS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_STORAGE_POLICY_ENABLED_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_STORAGE_POLICY_SATISFIER_MOVE_TASK_MAX_RETRY_ATTEMPTS_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_WEB_AUTHENTICATION_KERBEROS_PRINCIPAL_KEY;
 import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_DATA_TRANSFER_PROTECTION_KEY;
 import static org.apache.hadoop.hdfs.server.common.HdfsServerConstants.XATTR_SATISFY_STORAGE_POLICY;
@@ -130,6 +131,14 @@ public class TestExternalStoragePolicySatisfier {
   private static final int DEFAULT_BLOCK_SIZE = 1024;
   private static final Logger LOG =
       LoggerFactory.getLogger(TestExternalStoragePolicySatisfier.class);
+  private final ExternalSPSFaultInjector injector = new ExternalSPSFaultInjector() {
+    @Override
+    public void mockAnException(int retry) throws IOException {
+      if (retry < DFS_STORAGE_POLICY_SATISFIER_MOVE_TASK_MAX_RETRY_ATTEMPTS_DEFAULT) {
+        throw new IOException("IO exception");
+      }
+    }
+  };
 
   @Before
   public void setUp() {
@@ -480,6 +489,20 @@ public void testInfiniteStartWhenAnotherSPSRunning()
     }
   }
 
+  @Test(timeout = 300000)
+  public void testWhenStoragePolicySetToCOLDWithException()
+      throws Exception {
+
+    try {
+      createCluster();
+      // Mock an IOException 3 times, and moving tasks should succeed finally.
+      ExternalSPSFaultInjector.setInstance(injector);
+      doTestWhenStoragePolicySetToCOLD();
+    } finally {
+      shutdownCluster();
+    }
+  }
+
   private void doTestWhenStoragePolicySetToCOLD() throws Exception {
     // Change policy to COLD
     dfs.setStoragePolicy(new Path(FILE), COLD);