How to use

markSuspectBlock

method

in

org.apache.hadoop.hdfs.server.datanode.VolumeScanner

/**
 * Mark a block as "suspect."
 *
 * This means that we should try to rescan it soon.  Note that the
 * VolumeScanner keeps a list of recently suspicious blocks, which
 * it uses to avoid rescanning the same block over and over in a short
 * time frame.
 *
 * @param storageId     The ID of the storage where the block replica
 *                      is being stored.
 * @param block         The block's ID and block pool id.
 */
synchronized void markSuspectBlock(String storageId, ExtendedBlock block) {
 if (!isEnabled()) {
  LOG.debug("Not scanning suspicious block {} on {}, because the block " +
    "scanner is disabled.", block, storageId);
  return;
 }
 VolumeScanner scanner = scanners.get(storageId);
 if (scanner == null) {
  // This could happen if the volume is in the process of being removed.
  // The removal process shuts down the VolumeScanner, but the volume
  // object stays around as long as there are references to it (which
  // should not be that long.)
  LOG.info("Not scanning suspicious block {} on {}, because there is no " +
    "volume scanner for that storageId.", block, storageId);
  return;
 }
 scanner.markSuspectBlock(block);
}

/**
 * Mark a block as "suspect."
 *
 * This means that we should try to rescan it soon.  Note that the
 * VolumeScanner keeps a list of recently suspicious blocks, which
 * it uses to avoid rescanning the same block over and over in a short
 * time frame.
 *
 * @param storageId     The ID of the storage where the block replica
 *                      is being stored.
 * @param block         The block's ID and block pool id.
 */
synchronized void markSuspectBlock(String storageId, ExtendedBlock block) {
 if (!isEnabled()) {
  LOG.debug("Not scanning suspicious block {} on {}, because the block " +
    "scanner is disabled.", block, storageId);
  return;
 }
 VolumeScanner scanner = scanners.get(storageId);
 if (scanner == null) {
  // This could happen if the volume is in the process of being removed.
  // The removal process shuts down the VolumeScanner, but the volume
  // object stays around as long as there are references to it (which
  // should not be that long.)
  LOG.info("Not scanning suspicious block {} on {}, because there is no " +
    "volume scanner for that storageId.", block, storageId);
  return;
 }
 scanner.markSuspectBlock(block);
}

/**
 * Mark a block as "suspect."
 *
 * This means that we should try to rescan it soon.  Note that the
 * VolumeScanner keeps a list of recently suspicious blocks, which
 * it uses to avoid rescanning the same block over and over in a short
 * time frame.
 *
 * @param storageId     The ID of the storage where the block replica
 *                      is being stored.
 * @param block         The block's ID and block pool id.
 */
synchronized void markSuspectBlock(String storageId, ExtendedBlock block) {
 if (!isEnabled()) {
  LOG.debug("Not scanning suspicious block {} on {}, because the block " +
    "scanner is disabled.", block, storageId);
  return;
 }
 VolumeScanner scanner = scanners.get(storageId);
 if (scanner == null) {
  // This could happen if the volume is in the process of being removed.
  // The removal process shuts down the VolumeScanner, but the volume
  // object stays around as long as there are references to it (which
  // should not be that long.)
  LOG.info("Not scanning suspicious block {} on {}, because there is no " +
    "volume scanner for that storageId.", block, storageId);
  return;
 }
 scanner.markSuspectBlock(block);
}