Examples of org.apache.hadoop.hdfs.server.protocol.NamenodeCommand

Package org.apache.hadoop.hdfs.server.protocol

Examples of org.apache.hadoop.hdfs.server.protocol.NamenodeCommand

org.apache.hadoop.hdfs.server.protocol.NamenodeCommand
Base class for name-node command. Issued by the name-node to notify other name-nodes what should be done.


      if (isInSafeMode()) {
        throw new SafeModeException("Checkpoint not started", safeMode);
      }
      LOG.info("Start checkpoint for " + bnReg.getAddress());
      NamenodeCommand cmd = getFSImage().startCheckpoint(bnReg, nnReg);
      getEditLog().logSync();
      return cmd;
    } finally {
      writeUnlock();
    }

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  /**
   * Create a new checkpoint
   */
  void doCheckpoint() throws IOException {
    long startTime = now();
    NamenodeCommand cmd = 
      getNamenode().startCheckpoint(backupNode.getRegistration());
    CheckpointCommand cpCmd = null;
    switch(cmd.getAction()) {
      case NamenodeProtocol.ACT_SHUTDOWN:
        shutdown();
        throw new IOException("Name-node " + backupNode.nnRpcAddress
                                           + " requested shutdown.");
      case NamenodeProtocol.ACT_CHECKPOINT:
        cpCmd = (CheckpointCommand)cmd;
        break;
      default:
        throw new IOException("Unsupported NamenodeCommand: "+cmd.getAction());
    }


    CheckpointSignature sig = cpCmd.getSignature();
    assert FSConstants.LAYOUT_VERSION == sig.getLayoutVersion() :
      "Signature should have current layout version. Expected: "

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            + ". Current version: LV = " + getLayoutVersion()
            + " cTime = " + getCTime()
            + " checkpointTime = " + checkpointTime;
    if(msg != null) {
      LOG.error(msg);
      return new NamenodeCommand(NamenodeProtocol.ACT_SHUTDOWN);
    }
    boolean isImgObsolete = true;
    if(bnReg.getLayoutVersion() == this.getLayoutVersion()
        && bnReg.getCTime() == this.getCTime()
        && bnReg.getCheckpointTime() == this.checkpointTime)

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                                NamenodeRegistration nnReg) // active name-node
  throws IOException {
    writeLock();
    try {
    LOG.info("Start checkpoint for " + bnReg.getAddress());
    NamenodeCommand cmd = getFSImage().startCheckpoint(bnReg, nnReg);
    getEditLog().logSync();
    return cmd;
    } finally {
      writeUnlock();
    }

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    try {
      if (isInSafeMode()) {
        throw new SafeModeException("Checkpoint not started", safeMode);
      }
      LOG.info("Start checkpoint for " + bnReg.getAddress());
      NamenodeCommand cmd = getFSImage().startCheckpoint(bnReg, nnReg);
      getEditLog().logSync();
      return cmd;
    } finally {
      writeUnlock();
    }

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      if (isInSafeMode()) {
        throw new SafeModeException("Checkpoint not started", safeMode);
      }
      LOG.info("Start checkpoint for " + bnReg.getAddress());
      NamenodeCommand cmd = getFSImage().startCheckpoint(bnReg, nnReg);
      getEditLog().logSync();
      return cmd;
    } finally {
      writeUnlock();
    }

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            + " cTime = " + bnReg.getCTime()
            + ". Current version: LV = " + storage.getLayoutVersion()
            + " cTime = " + storage.getCTime();
    if(msg != null) {
      LOG.error(msg);
      return new NamenodeCommand(NamenodeProtocol.ACT_SHUTDOWN);
    }
    boolean needToReturnImg = true;
    if(storage.getNumStorageDirs(NameNodeDirType.IMAGE) == 0)
      // do not return image if there are no image directories
      needToReturnImg = false;

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            + " cTime = " + bnReg.getCTime()
            + ". Current version: LV = " + storage.getLayoutVersion()
            + " cTime = " + storage.getCTime();
    if(msg != null) {
      LOG.error(msg);
      return new NamenodeCommand(NamenodeProtocol.ACT_SHUTDOWN);
    }
    boolean needToReturnImg = true;
    if(storage.getNumStorageDirs(NameNodeDirType.IMAGE) == 0)
      // do not return image if there are no image directories
      needToReturnImg = false;

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    NNStorage bnStorage = bnImage.getStorage();


    long startTime = now();
    bnImage.freezeNamespaceAtNextRoll();
    
    NamenodeCommand cmd = 
      getRemoteNamenodeProxy().startCheckpoint(backupNode.getRegistration());
    CheckpointCommand cpCmd = null;
    switch(cmd.getAction()) {
      case NamenodeProtocol.ACT_SHUTDOWN:
        shutdown();
        throw new IOException("Name-node " + backupNode.nnRpcAddress
                                           + " requested shutdown.");
      case NamenodeProtocol.ACT_CHECKPOINT:
        cpCmd = (CheckpointCommand)cmd;
        break;
      default:
        throw new IOException("Unsupported NamenodeCommand: "+cmd.getAction());
    }


    bnImage.waitUntilNamespaceFrozen();
    
    CheckpointSignature sig = cpCmd.getSignature();

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        null);
    if (cacheEntry != null && cacheEntry.isSuccess()) {
      return (NamenodeCommand) cacheEntry.getPayload();
    }
    writeLock();
    NamenodeCommand cmd = null;
    try {
      checkOperation(OperationCategory.CHECKPOINT);
      checkNameNodeSafeMode("Checkpoint not started");
      
      LOG.info("Start checkpoint for " + backupNode.getAddress());

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Related Classes of org.apache.hadoop.hdfs.server.protocol.NamenodeCommand

org.apache.hadoop.hdfs.protocolPB.NamenodeProtocolServerSideTranslatorPB

org.apache.hadoop.hdfs.protocolPB.PBHelper

org.apache.hadoop.hdfs.server.namenode.Checkpointer

org.apache.hadoop.hdfs.server.namenode.FSImage

org.apache.hadoop.hdfs.server.namenode.FSNamesystem

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