Examples of org.apache.hadoop.hdfs.server.datanode.ReplicaInfo

Package org.apache.hadoop.hdfs.server.datanode

Examples of org.apache.hadoop.hdfs.server.datanode.ReplicaInfo

org.apache.hadoop.hdfs.server.datanode.ReplicaInfo
This class is used by datanodes to maintain meta data of its replicas. It provides a general interface for meta information of a replica.

   * @throws ReplicaNotFoundException if no entry is in the map or 
   *                        there is a generation stamp mismatch
   */
  ReplicaInfo getReplicaInfo(ExtendedBlock b)
      throws ReplicaNotFoundException {
    ReplicaInfo info = volumeMap.get(b.getBlockPoolId(), b.getLocalBlock());
    if (info == null) {
      throw new ReplicaNotFoundException(
          ReplicaNotFoundException.NON_EXISTENT_REPLICA + b);
    }
    return info;

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   * @throws ReplicaNotFoundException if no entry is in the map or 
   *                        there is a generation stamp mismatch
   */
  private ReplicaInfo getReplicaInfo(String bpid, long blkid)
      throws ReplicaNotFoundException {
    ReplicaInfo info = volumeMap.get(bpid, blkid);
    if (info == null) {
      throw new ReplicaNotFoundException(
          ReplicaNotFoundException.NON_EXISTENT_REPLICA + bpid + ":" + blkid);
    }
    return info;

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   * Returns handles to the block file and its metadata file
   */
  @Override // FsDatasetSpi
  public synchronized ReplicaInputStreams getTmpInputStreams(ExtendedBlock b, 
                          long blkOffset, long ckoff) throws IOException {
    ReplicaInfo info = getReplicaInfo(b);
    File blockFile = info.getBlockFile();
    RandomAccessFile blockInFile = new RandomAccessFile(blockFile, "r");
    if (blkOffset > 0) {
      blockInFile.seek(blkOffset);
    }
    File metaFile = info.getMetaFile();
    RandomAccessFile metaInFile = new RandomAccessFile(metaFile, "r");
    if (ckoff > 0) {
      metaInFile.seek(ckoff);
    }
    return new ReplicaInputStreams(blockInFile.getFD(), metaInFile.getFD());

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    // check the validity of the parameter
    if (newGS < b.getGenerationStamp()) {
      throw new IOException("The new generation stamp " + newGS + 
          " should be greater than the replica " + b + "'s generation stamp");
    }
    ReplicaInfo replicaInfo = getReplicaInfo(b);
    LOG.info("Appending to " + replicaInfo);
    if (replicaInfo.getState() != ReplicaState.FINALIZED) {
      throw new ReplicaNotFoundException(
          ReplicaNotFoundException.UNFINALIZED_REPLICA + b);
    }
    if (replicaInfo.getNumBytes() != expectedBlockLen) {
      throw new IOException("Corrupted replica " + replicaInfo + 
          " with a length of " + replicaInfo.getNumBytes() + 
          " expected length is " + expectedBlockLen);
    }


    return append(b.getBlockPoolId(), (FinalizedReplica)replicaInfo, newGS,
        b.getNumBytes());

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    return newReplicaInfo;
  }


  private ReplicaInfo recoverCheck(ExtendedBlock b, long newGS, 
      long expectedBlockLen) throws IOException {
    ReplicaInfo replicaInfo = getReplicaInfo(b.getBlockPoolId(), b.getBlockId());
    
    // check state
    if (replicaInfo.getState() != ReplicaState.FINALIZED &&
        replicaInfo.getState() != ReplicaState.RBW) {
      throw new ReplicaNotFoundException(
          ReplicaNotFoundException.UNFINALIZED_AND_NONRBW_REPLICA + replicaInfo);
    }


    // check generation stamp
    long replicaGenerationStamp = replicaInfo.getGenerationStamp();
    if (replicaGenerationStamp < b.getGenerationStamp() ||
        replicaGenerationStamp > newGS) {
      throw new ReplicaNotFoundException(
          ReplicaNotFoundException.UNEXPECTED_GS_REPLICA + replicaGenerationStamp
          + ". Expected GS range is [" + b.getGenerationStamp() + ", " + 
          newGS + "].");
    }
    
    // stop the previous writer before check a replica's length
    long replicaLen = replicaInfo.getNumBytes();
    if (replicaInfo.getState() == ReplicaState.RBW) {
      ReplicaBeingWritten rbw = (ReplicaBeingWritten)replicaInfo;
      // kill the previous writer
      rbw.stopWriter(datanode.getDnConf().getXceiverStopTimeout());
      rbw.setWriter(Thread.currentThread());
      // check length: bytesRcvd, bytesOnDisk, and bytesAcked should be the same

View Full Code Here

  @Override  // FsDatasetSpi
  public synchronized ReplicaInPipeline recoverAppend(ExtendedBlock b,
      long newGS, long expectedBlockLen) throws IOException {
    LOG.info("Recover failed append to " + b);


    ReplicaInfo replicaInfo = recoverCheck(b, newGS, expectedBlockLen);


    // change the replica's state/gs etc.
    if (replicaInfo.getState() == ReplicaState.FINALIZED ) {
      return append(b.getBlockPoolId(), (FinalizedReplica) replicaInfo, newGS, 
          b.getNumBytes());
    } else { //RBW
      bumpReplicaGS(replicaInfo, newGS);
      return (ReplicaBeingWritten)replicaInfo;

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  @Override // FsDatasetSpi
  public String recoverClose(ExtendedBlock b, long newGS,
      long expectedBlockLen) throws IOException {
    LOG.info("Recover failed close " + b);
    // check replica's state
    ReplicaInfo replicaInfo = recoverCheck(b, newGS, expectedBlockLen);
    // bump the replica's GS
    bumpReplicaGS(replicaInfo, newGS);
    // finalize the replica if RBW
    if (replicaInfo.getState() == ReplicaState.RBW) {
      finalizeReplica(b.getBlockPoolId(), replicaInfo);
    }
    return replicaInfo.getStorageUuid();
  }

View Full Code Here

  }


  @Override // FsDatasetSpi
  public synchronized ReplicaInPipeline createRbw(ExtendedBlock b)
      throws IOException {
    ReplicaInfo replicaInfo = volumeMap.get(b.getBlockPoolId(), 
        b.getBlockId());
    if (replicaInfo != null) {
      throw new ReplicaAlreadyExistsException("Block " + b +
      " already exists in state " + replicaInfo.getState() +
      " and thus cannot be created.");
    }
    // create a new block
    FsVolumeImpl v = volumes.getNextVolume(b.getNumBytes());
    // create a rbw file to hold block in the designated volume

View Full Code Here

  public synchronized ReplicaInPipeline recoverRbw(ExtendedBlock b,
      long newGS, long minBytesRcvd, long maxBytesRcvd)
      throws IOException {
    LOG.info("Recover RBW replica " + b);


    ReplicaInfo replicaInfo = getReplicaInfo(b.getBlockPoolId(), b.getBlockId());
    
    // check the replica's state
    if (replicaInfo.getState() != ReplicaState.RBW) {
      throw new ReplicaNotFoundException(
          ReplicaNotFoundException.NON_RBW_REPLICA + replicaInfo);
    }
    ReplicaBeingWritten rbw = (ReplicaBeingWritten)replicaInfo;

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        + visible);


    final ReplicaInPipeline temp;
    {
      // get replica
      final ReplicaInfo r = volumeMap.get(b.getBlockPoolId(), blockId);
      if (r == null) {
        throw new ReplicaNotFoundException(
            ReplicaNotFoundException.NON_EXISTENT_REPLICA + b);
      }
      // check the replica's state
      if (r.getState() != ReplicaState.TEMPORARY) {
        throw new ReplicaAlreadyExistsException(
            "r.getState() != ReplicaState.TEMPORARY, r=" + r);
      }
      temp = (ReplicaInPipeline)r;
    }

View Full Code Here

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