Java Code Examples for org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory#getPreviousDir()

The following examples show how to use org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory#getPreviousDir() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: NNUpgradeUtil.java From hadoop with Apache License 2.0

6 votes

/**
 * Return true if this storage dir can roll back to the previous storage
 * state, false otherwise. The NN will refuse to run the rollback operation
 * unless at least one JM or fsimage storage directory can roll back.
 * 
 * @param storage the storage info for the current state
 * @param prevStorage the storage info for the previous (unupgraded) state
 * @param targetLayoutVersion the layout version we intend to roll back to
 * @return true if this JM can roll back, false otherwise.
 * @throws IOException in the event of error
 */
static boolean canRollBack(StorageDirectory sd, StorageInfo storage,
    StorageInfo prevStorage, int targetLayoutVersion) throws IOException {
  File prevDir = sd.getPreviousDir();
  if (!prevDir.exists()) {  // use current directory then
    LOG.info("Storage directory " + sd.getRoot()
             + " does not contain previous fs state.");
    // read and verify consistency with other directories
    storage.readProperties(sd);
    return false;
  }

  // read and verify consistency of the prev dir
  prevStorage.readPreviousVersionProperties(sd);

  if (prevStorage.getLayoutVersion() != targetLayoutVersion) {
    throw new IOException(
      "Cannot rollback to storage version " +
      prevStorage.getLayoutVersion() +
      " using this version of the NameNode, which uses storage version " +
      targetLayoutVersion + ". " +
      "Please use the previous version of HDFS to perform the rollback.");
  }
  
  return true;
}

Example 2

Source File: NNUpgradeUtil.java From hadoop with Apache License 2.0

6 votes

/**
 * Finalize the upgrade. The previous dir, if any, will be renamed and
 * removed. After this is completed, rollback is no longer allowed.
 * 
 * @param sd the storage directory to finalize
 * @throws IOException in the event of error
 */
static void doFinalize(StorageDirectory sd) throws IOException {
  File prevDir = sd.getPreviousDir();
  if (!prevDir.exists()) { // already discarded
    LOG.info("Directory " + prevDir + " does not exist.");
    LOG.info("Finalize upgrade for " + sd.getRoot()+ " is not required.");
    return;
  }
  LOG.info("Finalizing upgrade of storage directory " + sd.getRoot());
  Preconditions.checkState(sd.getCurrentDir().exists(),
      "Current directory must exist.");
  final File tmpDir = sd.getFinalizedTmp();
  // rename previous to tmp and remove
  NNStorage.rename(prevDir, tmpDir);
  NNStorage.deleteDir(tmpDir);
  LOG.info("Finalize upgrade for " + sd.getRoot()+ " is complete.");
}

Example 3

Source File: NNUpgradeUtil.java From hadoop with Apache License 2.0

6 votes

/**
 * Rename the existing current dir to previous.tmp, and create a new empty
 * current dir.
 */
public static void renameCurToTmp(StorageDirectory sd) throws IOException {
  File curDir = sd.getCurrentDir();
  File prevDir = sd.getPreviousDir();
  final File tmpDir = sd.getPreviousTmp();

  Preconditions.checkState(curDir.exists(),
      "Current directory must exist for preupgrade.");
  Preconditions.checkState(!prevDir.exists(),
      "Previous directory must not exist for preupgrade.");
  Preconditions.checkState(!tmpDir.exists(),
      "Previous.tmp directory must not exist for preupgrade."
          + "Consider restarting for recovery.");

  // rename current to tmp
  NNStorage.rename(curDir, tmpDir);

  if (!curDir.mkdir()) {
    throw new IOException("Cannot create directory " + curDir);
  }
}

Example 4

Source File: NNUpgradeUtil.java From hadoop with Apache License 2.0

6 votes

/**
 * Perform the upgrade of the storage dir to the given storage info. The new
 * storage info is written into the current directory, and the previous.tmp
 * directory is renamed to previous.
 * 
 * @param sd the storage directory to upgrade
 * @param storage info about the new upgraded versions.
 * @throws IOException in the event of error
 */
public static void doUpgrade(StorageDirectory sd, Storage storage)
    throws IOException {
  LOG.info("Performing upgrade of storage directory " + sd.getRoot());
  try {
    // Write the version file, since saveFsImage only makes the
    // fsimage_<txid>, and the directory is otherwise empty.
    storage.writeProperties(sd);

    File prevDir = sd.getPreviousDir();
    File tmpDir = sd.getPreviousTmp();
    Preconditions.checkState(!prevDir.exists(),
        "previous directory must not exist for upgrade.");
    Preconditions.checkState(tmpDir.exists(),
        "previous.tmp directory must exist for upgrade.");

    // rename tmp to previous
    NNStorage.rename(tmpDir, prevDir);
  } catch (IOException ioe) {
    LOG.error("Unable to rename temp to previous for " + sd.getRoot(), ioe);
    throw ioe;
  }
}

Example 5

Source File: NNUpgradeUtil.java From hadoop with Apache License 2.0

6 votes

/**
 * Perform rollback of the storage dir to the previous state. The existing
 * current dir is removed, and the previous dir is renamed to current.
 * 
 * @param sd the storage directory to roll back.
 * @throws IOException in the event of error
 */
static void doRollBack(StorageDirectory sd)
    throws IOException {
  File prevDir = sd.getPreviousDir();
  if (!prevDir.exists()) {
    return;
  }

  File tmpDir = sd.getRemovedTmp();
  Preconditions.checkState(!tmpDir.exists(),
      "removed.tmp directory must not exist for rollback."
          + "Consider restarting for recovery.");
  // rename current to tmp
  File curDir = sd.getCurrentDir();
  Preconditions.checkState(curDir.exists(),
      "Current directory must exist for rollback.");

  NNStorage.rename(curDir, tmpDir);
  // rename previous to current
  NNStorage.rename(prevDir, curDir);

  // delete tmp dir
  NNStorage.deleteDir(tmpDir);
  LOG.info("Rollback of " + sd.getRoot() + " is complete.");
}

Example 6