Java Code Examples for org.apache.hadoop.fs.HardLink#getLinkCount()

The following examples show how to use org.apache.hadoop.fs.HardLink#getLinkCount() . 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: ReplicaInfo.java    From hadoop with Apache License 2.0 6 votes vote down vote up 
/**
 * Remove a hard link by copying the block to a temporary place and 
 * then moving it back
 * @param numLinks number of hard links
 * @return true if copy is successful; 
 *         false if it is already detached or no need to be detached
 * @throws IOException if there is any copy error
 */
public boolean unlinkBlock(int numLinks) throws IOException {
  if (isUnlinked()) {
    return false;
  }
  File file = getBlockFile();
  if (file == null || getVolume() == null) {
    throw new IOException("detachBlock:Block not found. " + this);
  }
  File meta = getMetaFile();

  if (HardLink.getLinkCount(file) > numLinks) {
    DataNode.LOG.info("CopyOnWrite for block " + this);
    unlinkFile(file, this);
  }
  if (HardLink.getLinkCount(meta) > numLinks) {
    unlinkFile(meta, this);
  }
  setUnlinked();
  return true;
}
Example 2
Source File: ReplicaInfo.java    From big-c with Apache License 2.0 6 votes vote down vote up 
/**
 * Remove a hard link by copying the block to a temporary place and 
 * then moving it back
 * @param numLinks number of hard links
 * @return true if copy is successful; 
 *         false if it is already detached or no need to be detached
 * @throws IOException if there is any copy error
 */
public boolean unlinkBlock(int numLinks) throws IOException {
  if (isUnlinked()) {
    return false;
  }
  File file = getBlockFile();
  if (file == null || getVolume() == null) {
    throw new IOException("detachBlock:Block not found. " + this);
  }
  File meta = getMetaFile();

  if (HardLink.getLinkCount(file) > numLinks) {
    DataNode.LOG.info("CopyOnWrite for block " + this);
    unlinkFile(file, this);
  }
  if (HardLink.getLinkCount(meta) > numLinks) {
    unlinkFile(meta, this);
  }
  setUnlinked();
  return true;
}
Example 3
Source File: DatanodeBlockInfo.java    From RDFS with Apache License 2.0 6 votes vote down vote up 
/**
 * Returns true if this block was copied, otherwise returns false.
 */
boolean detachBlock(int namespaceId, Block block, int numLinks) throws IOException {
  if (isDetached()) {
    return false;
  }
  if (file == null || volume == null) {
    throw new IOException("detachBlock:Block not found. " + block);
  }
  File meta = FSDataset.getMetaFile(file, block);
  if (meta == null) {
    throw new IOException("Meta file not found for block " + block);
  }

  if (HardLink.getLinkCount(file) > numLinks) {
    DataNode.LOG.info("CopyOnWrite for block " + block);
    detachFile(namespaceId, file, block);
  }
  if (HardLink.getLinkCount(meta) > numLinks) {
    detachFile(namespaceId, meta, block);
  }
  setDetached();
  return true;
}