EC : Busy DN replica should be consider in live replica check.

// code placeholder
targetIndices = new short[targets.length];
private void initTargetIndices() { 
  BitSet bitset = reconstructor.getLiveBitSet();
  int m = 0; hasValidTargets = false; 
  for (int i = 0; i < dataBlkNum + parityBlkNum; i++) {  
    if (!bitset.get) {    
      if (reconstructor.getBlockLen > 0) {
       if (m < targets.length) {
         targetIndices[m++] = (short)i;
         hasValidTargets = true;
        }
      }
    }
 }

// code placeholder
private int replicationStreamsHardLimit = DFSConfigKeys.DFS_NAMENODE_REPLICATION_STREAMS_HARD_LIMIT_DEFAULT;

numDNs = dataBlocks + parityBlocks + 10;

@Test(timeout = 240000)
public void testFileDecommission() throws Exception {
  LOG.info("Starting test testFileDecommission");
  final Path ecFile = new Path(ecDir, "testFileDecommission");
  int writeBytes = cellSize * dataBlocks;
  writeStripedFile(dfs, ecFile, writeBytes);
  Assert.assertEquals(0, bm.numOfUnderReplicatedBlocks());
  FileChecksum fileChecksum1 = dfs.getFileChecksum(ecFile, writeBytes);

  final INodeFile fileNode = cluster.getNamesystem().getFSDirectory()
      .getINode4Write(ecFile.toString()).asFile();

  LocatedBlocks locatedBlocks =
      StripedFileTestUtil.getLocatedBlocks(ecFile, dfs);

  LocatedBlock lb = dfs.getClient().getLocatedBlocks(ecFile.toString(), 0)
      .get(0);

  DatanodeInfo[] dnLocs = lb.getLocations();

  LocatedStripedBlock lastBlock =
      (LocatedStripedBlock)locatedBlocks.getLastLocatedBlock();

  DatanodeInfo[] storageInfos = lastBlock.getLocations();

  //
  DatanodeDescriptor datanodeDescriptor = cluster.getNameNode().getNamesystem()
      .getBlockManager().getDatanodeManager().getDatanode(storageInfos[6].getDatanodeUuid());

  BlockInfo firstBlock = fileNode.getBlocks()[0];
  DatanodeStorageInfo[] dStorageInfos = bm.getStorages(firstBlock);

  // the first heartbeat will consume 3 replica tasks
  for (int i = 0; i <= replicationStreamsHardLimit + 3; i++) {
    BlockManagerTestUtil.addBlockToBeReplicated(datanodeDescriptor, new Block(i),
        new DatanodeStorageInfo[]{dStorageInfos[0]});
  }
  assertEquals(dataBlocks + parityBlocks, dnLocs.length);
  int[] decommNodeIndex = {3, 4};

  final List<DatanodeInfo> decommisionNodes = new ArrayList<DatanodeInfo>();
  // add the node which will be decommissioning
  decommisionNodes.add(dnLocs[decommNodeIndex[0]]);
  decommisionNodes.add(dnLocs[decommNodeIndex[1]]);
  decommissionNode(0, decommisionNodes, AdminStates.DECOMMISSIONED);

  assertEquals(decommisionNodes.size(), fsn.getNumDecomLiveDataNodes());
  bm.getDatanodeManager().removeDatanode(datanodeDescriptor);
  //assertNull(checkFile(dfs, ecFile, 9, decommisionNodes, numDNs));

  // Ensure decommissioned datanode is not automatically shutdown
  DFSClient client = getDfsClient(cluster.getNameNode(0), conf);
  assertEquals("All datanodes must be alive", numDNs,
      client.datanodeReport(DatanodeReportType.LIVE).length);

  FileChecksum fileChecksum2 = dfs.getFileChecksum(ecFile, writeBytes);
  Assert.assertTrue("Checksum mismatches!",
      fileChecksum1.equals(fileChecksum2));

  StripedFileTestUtil.checkData(dfs, ecFile, writeBytes, decommisionNodes,
      null, blockGroupSize);
}