ZanderXu created HDFS-17394:
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             Summary: [FGL] Remove unused WriteHoldCount of FSNamesystemLock
                 Key: HDFS-17394
                 URL: https://issues.apache.org/jira/browse/HDFS-17394
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: ZanderXu


{code:java}
public int getWriteHoldCount() {
  return this.fsLock.getWriteHoldCount(FSNamesystemLockMode.GLOBAL);
}

@Deprecated // dirLock is obsolete, use namesystem.fsLock instead
public int getWriteHoldCount() {
  return namesystem.getWriteHoldCount();
}

// sanity check.
if (!hadDirReadLock || !hadFsnReadLock || hadDirWriteLock ||
    hadFsnWriteLock || dir.getReadHoldCount() != 1 ||
    fsn.getReadHoldCount() != 1) {
  // cannot relinquish
  return false;
} {code}
getWriteHoldCount in FSNamesystem.java and FSDirectory.java is unused.

dir.getReadHoldCount() is useless as it's same as fsn.getReadHoldCount().



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