Java NamenodeRegistration.getRole方法代码示例

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Register a Backup name-node, verifying that it belongs
 * to the correct namespace, and adding it to the set of
 * active journals if necessary.
 * 
 * @param bnReg registration of the new BackupNode
 * @param nnReg registration of this NameNode
 * @throws IOException if the namespace IDs do not match
 */
void registerBackupNode(NamenodeRegistration bnReg,
    NamenodeRegistration nnReg) throws IOException {
  writeLock();
  try {
    if(getFSImage().getStorage().getNamespaceID() 
       != bnReg.getNamespaceID())
      throw new IOException("Incompatible namespaceIDs: "
          + " Namenode namespaceID = "
          + getFSImage().getStorage().getNamespaceID() + "; "
          + bnReg.getRole() +
          " node namespaceID = " + bnReg.getNamespaceID());
    if (bnReg.getRole() == NamenodeRole.BACKUP) {
      getFSImage().getEditLog().registerBackupNode(
          bnReg, nnReg);
    }
  } finally {
    writeUnlock();
  }
}
 

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Release (unregister) backup node.
 * <p>
 * Find and remove the backup stream corresponding to the node.
 * @throws IOException
 */
void releaseBackupNode(NamenodeRegistration registration)
  throws IOException {
  checkOperation(OperationCategory.WRITE);
  writeLock();
  try {
    checkOperation(OperationCategory.WRITE);
    if(getFSImage().getStorage().getNamespaceID()
       != registration.getNamespaceID())
      throw new IOException("Incompatible namespaceIDs: "
          + " Namenode namespaceID = "
          + getFSImage().getStorage().getNamespaceID() + "; "
          + registration.getRole() +
          " node namespaceID = " + registration.getNamespaceID());
    getEditLog().releaseBackupStream(registration);
  } finally {
    writeUnlock();
  }
}
 

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Release (unregister) backup node.
 * <p>
 * Find and remove the backup stream corresponding to the node.
 * @param registration
 * @throws IOException
 */
void releaseBackupNode(NamenodeRegistration registration)
  throws IOException {
  checkOperation(OperationCategory.WRITE);
  writeLock();
  try {
    checkOperation(OperationCategory.WRITE);
    if(getFSImage().getStorage().getNamespaceID()
       != registration.getNamespaceID())
      throw new IOException("Incompatible namespaceIDs: "
          + " Namenode namespaceID = "
          + getFSImage().getStorage().getNamespaceID() + "; "
          + registration.getRole() +
          " node namespaceID = " + registration.getNamespaceID());
    getEditLog().releaseBackupStream(registration);
  } finally {
    writeUnlock();
  }
}
 

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Register a name-node.
 * <p>
 * Registration is allowed if there is no ongoing streaming to
 * another backup node.
 * We currently allow only one backup node, but multiple chackpointers 
 * if there are no backups.
 * 
 * @param registration
 * @throws IOException
 */
void registerBackupNode(NamenodeRegistration registration)
throws IOException {
  writeLock();
  try {
  if(getFSImage().getNamespaceID() != registration.getNamespaceID())
    throw new IOException("Incompatible namespaceIDs: " 
        + " Namenode namespaceID = " + getFSImage().getNamespaceID() 
        + "; " + registration.getRole() +
            " node namespaceID = " + registration.getNamespaceID());
  boolean regAllowed = getEditLog().checkBackupRegistration(registration);
  if(!regAllowed)
    throw new IOException("Registration is not allowed. " +
        "Another node is registered as a backup.");
  } finally {
    writeUnlock();
  }
}
 

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Start checkpoint.
 * <p>
 * If backup storage contains image that is newer than or incompatible with 
 * what the active name-node has, then the backup node should shutdown.<br>
 * If the backup image is older than the active one then it should 
 * be discarded and downloaded from the active node.<br>
 * If the images are the same then the backup image will be used as current.
 * 
 * @param bnReg the backup node registration.
 * @param nnReg this (active) name-node registration.
 * @return {@link NamenodeCommand} if backup node should shutdown or
 * {@link CheckpointCommand} prescribing what backup node should 
 *         do with its image.
 * @throws IOException
 */
NamenodeCommand startCheckpoint(NamenodeRegistration bnReg, // backup node
                                NamenodeRegistration nnReg) // active name-node
throws IOException {
  LOG.info("Start checkpoint at txid " + getEditLog().getLastWrittenTxId());
  String msg = null;
  // Verify that checkpoint is allowed
  if(bnReg.getNamespaceID() != storage.getNamespaceID())
    msg = "Name node " + bnReg.getAddress()
          + " has incompatible namespace id: " + bnReg.getNamespaceID()
          + " expected: " + storage.getNamespaceID();
  else if(bnReg.isRole(NamenodeRole.NAMENODE))
    msg = "Name node " + bnReg.getAddress()
          + " role " + bnReg.getRole() + ": checkpoint is not allowed.";
  else if(bnReg.getLayoutVersion() < storage.getLayoutVersion()
      || (bnReg.getLayoutVersion() == storage.getLayoutVersion()
          && bnReg.getCTime() > storage.getCTime()))
    // remote node has newer image age
    msg = "Name node " + bnReg.getAddress()
          + " has newer image layout version: LV = " +bnReg.getLayoutVersion()
          + " 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;
  CheckpointSignature sig = rollEditLog();
  return new CheckpointCommand(sig, needToReturnImg);
}
 

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Start checkpoint.
 * <p>
 * If backup storage contains image that is newer than or incompatible with 
 * what the active name-node has, then the backup node should shutdown.<br>
 * If the backup image is older than the active one then it should 
 * be discarded and downloaded from the active node.<br>
 * If the images are the same then the backup image will be used as current.
 * 
 * @param bnReg the backup node registration.
 * @param nnReg this (active) name-node registration.
 * @return {@link NamenodeCommand} if backup node should shutdown or
 * {@link CheckpointCommand} prescribing what backup node should 
 *         do with its image.
 * @throws IOException
 */
NamenodeCommand startCheckpoint(NamenodeRegistration bnReg, // backup node
                                NamenodeRegistration nnReg,
                                int layoutVersion) // active name-node
throws IOException {
  LOG.info("Start checkpoint at txid " + getEditLog().getLastWrittenTxId());
  String msg = null;
  // Verify that checkpoint is allowed
  if(bnReg.getNamespaceID() != storage.getNamespaceID())
    msg = "Name node " + bnReg.getAddress()
          + " has incompatible namespace id: " + bnReg.getNamespaceID()
          + " expected: " + storage.getNamespaceID();
  else if(bnReg.isRole(NamenodeRole.NAMENODE))
    msg = "Name node " + bnReg.getAddress()
          + " role " + bnReg.getRole() + ": checkpoint is not allowed.";
  else if(bnReg.getLayoutVersion() < storage.getLayoutVersion()
      || (bnReg.getLayoutVersion() == storage.getLayoutVersion()
          && bnReg.getCTime() > storage.getCTime()))
    // remote node has newer image age
    msg = "Name node " + bnReg.getAddress()
          + " has newer image layout version: LV = " +bnReg.getLayoutVersion()
          + " 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;
  CheckpointSignature sig = rollEditLog(layoutVersion);
  return new CheckpointCommand(sig, needToReturnImg);
}
 

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Release (unregister) backup node.
 * <p>
 * Find and remove the backup stream corresponding to the node.
 * @param registration
 * @throws IOException
 */
void releaseBackupNode(NamenodeRegistration registration)
throws IOException {
  writeLock();
  try {
  if(getFSImage().getNamespaceID() != registration.getNamespaceID())
    throw new IOException("Incompatible namespaceIDs: " 
        + " Namenode namespaceID = " + getFSImage().getNamespaceID() 
        + "; " + registration.getRole() +
            " node namespaceID = " + registration.getNamespaceID());
  getEditLog().releaseBackupStream(registration);
  } finally {
    writeUnlock();
  }
}
 

import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration; //导入方法依赖的package包/类
/**
 * Start checkpoint.
 * <p>
 * If backup storage contains image that is newer than or incompatible with 
 * what the active name-node has, then the backup node should shutdown.<br>
 * If the backup image is older than the active one then it should 
 * be discarded and downloaded from the active node.<br>
 * If the images are the same then the backup image will be used as current.
 * 
 * @param bnReg the backup node registration.
 * @param nnReg this (active) name-node registration.
 * @return {@link NamenodeCommand} if backup node should shutdown or
 * {@link CheckpointCommand} prescribing what backup node should 
 *         do with its image.
 * @throws IOException
 */
NamenodeCommand startCheckpoint(NamenodeRegistration bnReg, // backup node
                                NamenodeRegistration nnReg) // active name-node
throws IOException {
  String msg = null;
  // Verify that checkpoint is allowed
  if(bnReg.getNamespaceID() != this.getNamespaceID())
    msg = "Name node " + bnReg.getAddress()
          + " has incompatible namespace id: " + bnReg.getNamespaceID()
          + " expected: " + getNamespaceID();
  else if(bnReg.isRole(NamenodeRole.ACTIVE))
    msg = "Name node " + bnReg.getAddress()
          + " role " + bnReg.getRole() + ": checkpoint is not allowed.";
  else if(bnReg.getLayoutVersion() < this.getLayoutVersion()
      || (bnReg.getLayoutVersion() == this.getLayoutVersion()
          && bnReg.getCTime() > this.getCTime())
      || (bnReg.getLayoutVersion() == this.getLayoutVersion()
          && bnReg.getCTime() == this.getCTime()
          && bnReg.getCheckpointTime() > this.checkpointTime))
    // remote node has newer image age
    msg = "Name node " + bnReg.getAddress()
          + " has newer image layout version: LV = " +bnReg.getLayoutVersion()
          + " cTime = " + bnReg.getCTime()
          + " checkpointTime = " + bnReg.getCheckpointTime()
          + ". 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)
    isImgObsolete = false;
  boolean needToReturnImg = true;
  if(getNumStorageDirs(NameNodeDirType.IMAGE) == 0)
    // do not return image if there are no image directories
    needToReturnImg = false;
  CheckpointSignature sig = rollEditLog();
  getEditLog().logJSpoolStart(bnReg, nnReg);
  return new CheckpointCommand(sig, isImgObsolete, needToReturnImg);
}