HDFS-9275. Wait previous ErasureCodingWork to finish before schedule another one. (Walter Su via yliu)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -849,6 +849,9 @@ Trunk (Unreleased)
       HDFS-8438. Erasure Coding: Allow concat striped files if they have the same
       ErasureCodingPolicy. (Walter Su via jing9)
 
+      HDFS-9275. Wait previous ErasureCodingWork to finish before schedule
+      another one. (Walter Su via yliu)
+
 Release 2.8.0 - UNRELEASED
 
   NEW FEATURES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -1586,6 +1586,10 @@ public class BlockManager implements BlockStatsMXBean {
     }
 
     if (block.isStriped()) {
+      if (pendingNum > 0) {
+        // Wait the previous recovery to finish.
+        return null;
+      }
       short[] indices = new short[liveBlockIndices.size()];
       for (int i = 0 ; i < liveBlockIndices.size(); i++) {
         indices[i] = liveBlockIndices.get(i);
@@ -1641,6 +1645,7 @@ public class BlockManager implements BlockStatsMXBean {
     if (block.isStriped()) {
       assert rw instanceof ErasureCodingWork;
       assert rw.getTargets().length > 0;
+      assert pendingNum == 0: "Should wait the previous recovery to finish";
       String src = getBlockCollection(block).getName();
       ErasureCodingPolicy ecPolicy = null;
       try {

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

@@ -61,10 +61,10 @@ public class StripedFileTestUtil {
   public static final int BLOCK_STRIPED_CELL_SIZE = 64 * 1024;
   public static final int BLOCK_STRIPE_SIZE = BLOCK_STRIPED_CELL_SIZE * NUM_DATA_BLOCKS;
 
-  static final int stripesPerBlock = 4;
+  public static final int stripesPerBlock = 4;
-  static final int blockSize = BLOCK_STRIPED_CELL_SIZE * stripesPerBlock;
+  public static final int blockSize = BLOCK_STRIPED_CELL_SIZE * stripesPerBlock;
-  static final int numDNs = NUM_DATA_BLOCKS + NUM_PARITY_BLOCKS + 2;
+  public static final int numDNs = NUM_DATA_BLOCKS + NUM_PARITY_BLOCKS + 2;
-  static final int BLOCK_GROUP_SIZE = blockSize * NUM_DATA_BLOCKS;
+  public static final int BLOCK_GROUP_SIZE = blockSize * NUM_DATA_BLOCKS;
 
 
   static byte[] generateBytes(int cnt) {

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

@@ -57,6 +57,8 @@ public class TestDFSStripedOutputStream {
     int numDNs = dataBlocks + parityBlocks + 2;
     conf = new Configuration();
     conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, blockSize);
+    conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_REPLICATION_CONSIDERLOAD_KEY,
+        false);
     conf.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_MAX_STREAMS_KEY, 0);
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDNs).build();
     cluster.getFileSystem().getClient().setErasureCodingPolicy("/", null);

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

@@ -41,9 +41,9 @@ import static org.apache.hadoop.hdfs.StripedFileTestUtil.numDNs;
 public class TestReadStripedFileWithMissingBlocks {
   public static final Log LOG = LogFactory
       .getLog(TestReadStripedFileWithMissingBlocks.class);
-  private static MiniDFSCluster cluster;
+  private MiniDFSCluster cluster;
-  private static DistributedFileSystem fs;
+  private DistributedFileSystem fs;
-  private static Configuration conf = new HdfsConfiguration();
+  private Configuration conf = new HdfsConfiguration();
   private final short dataBlocks = StripedFileTestUtil.NUM_DATA_BLOCKS;
   private final int cellSize = StripedFileTestUtil.BLOCK_STRIPED_CELL_SIZE;
   private final int fileLength = blockSize * dataBlocks + 123;

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

@@ -20,9 +20,7 @@ package org.apache.hadoop.hdfs;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
-import java.io.ByteArrayOutputStream;
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.BitSet;
@@ -41,11 +39,9 @@ import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.LocatedStripedBlock;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManagerTestUtil;
-import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
-import org.apache.hadoop.hdfs.server.namenode.NameNodeAdapter;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
 import org.apache.hadoop.hdfs.server.protocol.BlockECRecoveryCommand.BlockECRecoveryInfo;
 import org.apache.hadoop.hdfs.util.StripedBlockUtil;
@@ -80,9 +76,12 @@ public class TestRecoverStripedFile {
   public void setup() throws IOException {
     conf = new Configuration();
     conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, blockSize);
-    conf.setInt(DFSConfigKeys.DFS_DATANODE_STRIPED_READ_BUFFER_SIZE_KEY, cellSize - 1);
+    conf.setInt(DFSConfigKeys.DFS_DATANODE_STRIPED_READ_BUFFER_SIZE_KEY,
+        cellSize - 1);
     conf.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY, 1);
-    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(dnNum).build();;
+    conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_REPLICATION_CONSIDERLOAD_KEY,
+        false);
+    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(dnNum).build();
     cluster.waitActive();
     
     fs = cluster.getFileSystem();
@@ -251,14 +250,12 @@ public class TestRecoverStripedFile {
           lastBlock.getBlockSize(), cellSize, dataBlkNum, indices[toDead[i]]));
       assertTrue(metadatas[i].getName().
           endsWith(blocks[i].getGenerationStamp() + ".meta"));
-      replicaContents[i] = readReplica(replicas[i]);
+      replicaContents[i] = DFSTestUtil.readFileAsBytes(replicas[i]);
     }
     
     int cellsNum = (fileLen - 1) / cellSize + 1;
     int groupSize = Math.min(cellsNum, dataBlkNum) + parityBlkNum;
 
-    try {
-      DatanodeID[] dnIDs = new DatanodeID[toRecoverBlockNum];
     for (int i = 0; i < toRecoverBlockNum; i++) {
       /*
        * Kill the datanode which contains one replica
@@ -267,9 +264,8 @@ public class TestRecoverStripedFile {
        */
       DataNode dn = cluster.getDataNodes().get(deadDnIndices[i]);
       dn.shutdown();
-        dnIDs[i] = dn.getDatanodeId();
+      cluster.setDataNodeDead(dn.getDatanodeId());
     }
-      setDataNodesDead(dnIDs);
 
     // Check the locatedBlocks of the file again
     locatedBlocks = getLocatedBlocks(file);
@@ -297,34 +293,11 @@ public class TestRecoverStripedFile {
       assertEquals(replicaAfterRecovery.length(), replicas[i].length());
       assertTrue(metadataAfterRecovery.getName().
           endsWith(blocks[i].getGenerationStamp() + ".meta"));
-        byte[] replicaContentAfterRecovery = readReplica(replicaAfterRecovery);
+      byte[] replicaContentAfterRecovery =
+          DFSTestUtil.readFileAsBytes(replicaAfterRecovery);
 
       Assert.assertArrayEquals(replicaContents[i], replicaContentAfterRecovery);
     }
-    } finally {
-      for (int i = 0; i < toRecoverBlockNum; i++) {
-        restartDataNode(toDead[i]);
-      }
-      cluster.waitActive();
-    }
-    fs.delete(file, true);
-  }
-  
-  private void setDataNodesDead(DatanodeID[] dnIDs) throws IOException {
-    for (DatanodeID dn : dnIDs) {
-      DatanodeDescriptor dnd =
-          NameNodeAdapter.getDatanode(cluster.getNamesystem(), dn);
-      DFSTestUtil.setDatanodeDead(dnd);
-    }
-    
-    BlockManagerTestUtil.checkHeartbeat(cluster.getNamesystem().getBlockManager());
-  }
-  
-  private void restartDataNode(int dn) {
-    try {
-      cluster.restartDataNode(dn, true, true);
-    } catch (IOException e) {
-    }
   }
 
   private int[] sortTargetsByReplicas(ExtendedBlock[] blocks, int[] targetDNs) {
@@ -348,30 +321,6 @@ public class TestRecoverStripedFile {
     return result;
   }
 
-  private byte[] readReplica(File replica) throws IOException {
-    int length = (int)replica.length();
-    ByteArrayOutputStream content = new ByteArrayOutputStream(length);
-    FileInputStream in = new FileInputStream(replica);
-    try {
-      byte[] buffer = new byte[1024];
-      int total = 0;
-      while (total < length) {
-        int n = in.read(buffer);
-        if (n <= 0) {
-          break;
-        }
-        content.write(buffer, 0, n);
-        total += n;
-      }
-      if (total < length) {
-        Assert.fail("Failed to read all content of replica");
-      }
-      return content.toByteArray();
-    } finally {
-      in.close();
-    }
-  }
-  
   private LocatedBlocks waitForRecoveryFinished(Path file, int groupSize) 
       throws Exception {
     final int ATTEMPTS = 60;

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

@@ -46,8 +46,8 @@ public class TestSafeModeWithStripedFile {
   static final int cellSize = StripedFileTestUtil.BLOCK_STRIPED_CELL_SIZE;
   static final int blockSize = cellSize * 2;
 
-  static MiniDFSCluster cluster;
+  private MiniDFSCluster cluster;
-  static Configuration conf;
+  private Configuration conf;
 
   @Before
   public void setup() throws IOException {
@@ -57,7 +57,6 @@ public class TestSafeModeWithStripedFile {
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDNs).build();
     cluster.getFileSystem().getClient().setErasureCodingPolicy("/", null);
     cluster.waitActive();
-
   }
 
   @After

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

@@ -47,11 +47,11 @@ import static org.apache.hadoop.hdfs.StripedFileTestUtil.stripesPerBlock;
 
 public class TestWriteReadStripedFile {
   public static final Log LOG = LogFactory.getLog(TestWriteReadStripedFile.class);
-  private static MiniDFSCluster cluster;
-  private static DistributedFileSystem fs;
   private static int cellSize = StripedFileTestUtil.BLOCK_STRIPED_CELL_SIZE;
   private static short dataBlocks = StripedFileTestUtil.NUM_DATA_BLOCKS;
-  private static Configuration conf = new HdfsConfiguration();
+  private MiniDFSCluster cluster;
+  private DistributedFileSystem fs;
+  private Configuration conf = new HdfsConfiguration();
 
   static {
     GenericTestUtils.setLogLevel(DFSOutputStream.LOG, Level.ALL);
@@ -64,6 +64,8 @@ public class TestWriteReadStripedFile {
   @Before
   public void setup() throws IOException {
     conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, blockSize);
+    conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_REPLICATION_CONSIDERLOAD_KEY,
+        false);
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDNs).build();
     fs = cluster.getFileSystem();
     fs.mkdirs(new Path("/ec"));

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

@@ -38,9 +38,9 @@ import static org.apache.hadoop.hdfs.StripedFileTestUtil.numDNs;
 public class TestWriteStripedFileWithFailure {
   public static final Log LOG = LogFactory
       .getLog(TestWriteStripedFileWithFailure.class);
-  private static MiniDFSCluster cluster;
+  private MiniDFSCluster cluster;
-  private static FileSystem fs;
+  private FileSystem fs;
-  private static Configuration conf = new HdfsConfiguration();
+  private Configuration conf = new HdfsConfiguration();
 
   static {
     GenericTestUtils.setLogLevel(DFSOutputStream.LOG, Level.ALL);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestBlockTokenWithDFSStriped.java

@@ -36,8 +36,8 @@ public class TestBlockTokenWithDFSStriped extends TestBlockTokenWithDFS {
   private final static int cellSize = StripedFileTestUtil.BLOCK_STRIPED_CELL_SIZE;
   private final static int stripesPerBlock = 4;
   private final static int numDNs = dataBlocks + parityBlocks + 2;
-  private static MiniDFSCluster cluster;
+  private MiniDFSCluster cluster;
-  private static Configuration conf;
+  private Configuration conf;
 
   {
     BLOCK_SIZE = cellSize * stripesPerBlock;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestRecoverStripedBlocks.java

@@ -21,30 +21,41 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.StripedFileTestUtil;
 import org.apache.hadoop.hdfs.protocol.Block;
+import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+import org.apache.hadoop.hdfs.protocol.LocatedBlock;
+import org.apache.hadoop.hdfs.protocol.LocatedStripedBlock;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoStriped;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockManagerTestUtil;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor;
+import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager;
 import org.apache.hadoop.hdfs.server.blockmanagement.DatanodeStorageInfo;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
 import org.apache.hadoop.hdfs.server.protocol.BlockECRecoveryCommand.BlockECRecoveryInfo;
+
+import org.apache.hadoop.hdfs.util.StripedBlockUtil;
 import org.junit.Test;
 import java.util.List;
 
 import static org.apache.hadoop.hdfs.StripedFileTestUtil.BLOCK_STRIPED_CELL_SIZE;
 import static org.apache.hadoop.hdfs.StripedFileTestUtil.NUM_DATA_BLOCKS;
 import static org.apache.hadoop.hdfs.StripedFileTestUtil.NUM_PARITY_BLOCKS;
+import static org.apache.hadoop.hdfs.StripedFileTestUtil.blockSize;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 public class TestRecoverStripedBlocks {
+  private static final int cellSize = StripedFileTestUtil.BLOCK_STRIPED_CELL_SIZE;
   private final short GROUP_SIZE =
       (short) (NUM_DATA_BLOCKS + NUM_PARITY_BLOCKS);
+
   private MiniDFSCluster cluster;
   private final Path dirPath = new Path("/dir");
   private Path filePath = new Path(dirPath, "file");
@@ -166,4 +177,63 @@ public class TestRecoverStripedBlocks {
       cluster.shutdown();
     }
   }
+
+  @Test
+  public void test2RecoveryTasksForSameBlockGroup() throws Exception {
+    Configuration conf = new HdfsConfiguration();
+    conf.setInt(DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY, 1000);
+    conf.setInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY, 1000);
+    conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, blockSize);
+    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(GROUP_SIZE + 2)
+        .build();
+    try {
+      cluster.waitActive();
+      DistributedFileSystem fs = cluster.getFileSystem();
+      BlockManager bm = cluster.getNamesystem().getBlockManager();
+      fs.getClient().setErasureCodingPolicy("/", null);
+      int fileLen = NUM_DATA_BLOCKS * blockSize;
+      Path p = new Path("/test2RecoveryTasksForSameBlockGroup");
+      final byte[] data = new byte[fileLen];
+      DFSTestUtil.writeFile(fs, p, data);
+
+      LocatedStripedBlock lb = (LocatedStripedBlock)fs.getClient()
+          .getLocatedBlocks(p.toString(), 0).get(0);
+      LocatedBlock[] lbs = StripedBlockUtil.parseStripedBlockGroup(lb,
+          cellSize, NUM_DATA_BLOCKS, NUM_PARITY_BLOCKS);
+
+      assertEquals(0, getNumberOfBlocksToBeErasureCoded(cluster));
+      assertEquals(0, bm.getPendingReplicationBlocksCount());
+
+      // missing 1 block, so 1 task should be scheduled
+      DatanodeInfo dn0 = lbs[0].getLocations()[0];
+      cluster.stopDataNode(dn0.getName());
+      cluster.setDataNodeDead(dn0);
+      BlockManagerTestUtil.getComputedDatanodeWork(bm);
+      assertEquals(1, getNumberOfBlocksToBeErasureCoded(cluster));
+      assertEquals(1, bm.getPendingReplicationBlocksCount());
+
+      // missing another block, but no new task should be scheduled because
+      // previous task isn't finished.
+      DatanodeInfo dn1 = lbs[1].getLocations()[0];
+      cluster.stopDataNode(dn1.getName());
+      cluster.setDataNodeDead(dn1);
+      BlockManagerTestUtil.getComputedDatanodeWork(bm);
+      assertEquals(1, getNumberOfBlocksToBeErasureCoded(cluster));
+      assertEquals(1, bm.getPendingReplicationBlocksCount());
+    } finally {
+      cluster.shutdown();
+    }
+  }
+
+  private static int getNumberOfBlocksToBeErasureCoded(MiniDFSCluster cluster)
+      throws Exception {
+    DatanodeManager dm =
+        cluster.getNamesystem().getBlockManager().getDatanodeManager();
+    int count = 0;
+    for( DataNode dn : cluster.getDataNodes()){
+      DatanodeDescriptor dd = dm.getDatanode(dn.getDatanodeId());
+      count += dd.getNumberOfBlocksToBeErasureCoded();
+    }
+    return count;
+  }
 }