HDFS-11674. reserveSpaceForReplicas is not released if append request failed due to mirror down and replica recovered (Contributed by Vinayakumar B)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java

@@ -2455,6 +2455,10 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
       LOG.info("initReplicaRecovery: changing replica state for "
           + block + " from " + replica.getState()
           + " to " + rur.getState());
+      if (replica.getState() == ReplicaState.TEMPORARY || replica
+          .getState() == ReplicaState.RBW) {
+        ((ReplicaInPipeline) replica).releaseAllBytesReserved();
+      }
     }
     return rur.createInfo();
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/DFSTestUtil.java

@@ -1462,6 +1462,11 @@ public class DFSTestUtil {
     out.abort();
   }
 
+  public static void setPipeline(DFSOutputStream out, LocatedBlock lastBlock)
+      throws IOException {
+    out.getStreamer().setPipelineInConstruction(lastBlock);
+  }
+
   public static byte[] asArray(ByteBuffer buf) {
     byte arr[] = new byte[buf.remaining()];
     buf.duplicate().get(arr);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestSpaceReservation.java

@@ -31,10 +31,13 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
 
 import org.apache.hadoop.fs.BlockLocation;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.HdfsBlockLocation;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.*;
 import org.apache.hadoop.hdfs.protocol.Block;
+import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.datanode.DataNodeFaultInjector;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
@@ -44,6 +47,7 @@ import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.Daemon;
 import org.apache.log4j.Level;
 import org.junit.After;
+import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
@@ -82,9 +86,12 @@ public class TestSpaceReservation {
 
   private static Random rand = new Random();
 
-  private void initConfig(int blockSize) {
+  @Before
+  public void before() {
     conf = new HdfsConfiguration();
+  }
 
+  private void initConfig(int blockSize) {
     // Refresh disk usage information frequently.
     conf.setInt(FS_DU_INTERVAL_KEY, DU_REFRESH_INTERVAL_MSEC);
     conf.setLong(DFS_BLOCK_SIZE_KEY, blockSize);
@@ -680,4 +687,62 @@ public class TestSpaceReservation {
       }
     }
   }
+
+  @Test(timeout = 60000)
+  public void testReservedSpaceForLeaseRecovery() throws Exception {
+    final short replication = 3;
+    conf.setInt(
+        CommonConfigurationKeysPublic.IPC_CLIENT_CONNECT_MAX_RETRIES_KEY, 2);
+    conf.setInt(
+        CommonConfigurationKeysPublic.IPC_CLIENT_CONNECT_RETRY_INTERVAL_KEY,
+        1000);
+    startCluster(BLOCK_SIZE, replication, -1);
+
+    final String methodName = GenericTestUtils.getMethodName();
+    final Path file = new Path("/" + methodName + ".01.dat");
+    // Write to the file and kill the writer.
+    FSDataOutputStream os = fs.create(file, replication);
+    os.write(new byte[8192]);
+    os.hflush();
+    os.close();
+    /*
+     * Reset the pipeline for the append in such a way that, datanode which is
+     * down is one of the mirror, not the first datanode.
+     */
+    HdfsBlockLocation blockLocation = (HdfsBlockLocation) fs.getClient()
+        .getBlockLocations(file.toString(), 0, BLOCK_SIZE)[0];
+    LocatedBlock lastBlock = blockLocation.getLocatedBlock();
+    // stop 3rd node.
+    cluster.stopDataNode(lastBlock.getLocations()[2].getName());
+    try {
+      os = fs.append(file);
+      DFSTestUtil.setPipeline((DFSOutputStream) os.getWrappedStream(),
+          lastBlock);
+      os.writeBytes("hi");
+      os.hsync();
+    } catch (IOException e) {
+      // Append will fail due to not able to replace datanodes in 3 nodes
+      // cluster.
+      LOG.info("", e);
+    }
+    DFSTestUtil.abortStream((DFSOutputStream) os.getWrappedStream());
+    /*
+     * There is a chance that stopped DN could be chosen as primary for
+     * recovery. If so, then recovery will not happen in time. So mark stopped
+     * node as dead to exclude that node.
+     */
+    cluster.setDataNodeDead(lastBlock.getLocations()[2]);
+    fs.recoverLease(file);
+    GenericTestUtils.waitFor(new Supplier<Boolean>() {
+      @Override
+      public Boolean get() {
+        try {
+          return fs.isFileClosed(file);
+        } catch (IOException e) {
+          return false;
+        }
+      }
+    }, 500, 30000);
+    checkReservedSpace(0);
+  }
 }