[jira] [Created] (HDFS-17390) [FGL] FSDirectory supports this fine-grained locking

["ZanderXu (Jira)" <ji...@apache.org>]

ZanderXu created HDFS-17390:
-------------------------------

             Summary: [FGL] FSDirectory supports this fine-grained locking
                 Key: HDFS-17390
                 URL: https://issues.apache.org/jira/browse/HDFS-17390
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: ZanderXu


{code:java}
/**
 * The directory lock dirLock provided redundant locking.
 * It has been used whenever namesystem.fsLock was used.
 * dirLock is now removed and utility methods to acquire and release dirLock
 * remain as placeholders only
 */
void readLock() {
  assert namesystem.hasReadLock() : "Should hold namesystem read lock";
}

void readUnlock() {
  assert namesystem.hasReadLock() : "Should hold namesystem read lock";
}

void writeLock() {
  assert namesystem.hasWriteLock() : "Should hold namesystem write lock";
}

void writeUnlock() {
  assert namesystem.hasWriteLock() : "Should hold namesystem write lock";
}

boolean hasWriteLock() {
  return namesystem.hasWriteLock();
}

boolean hasReadLock() {
  return namesystem.hasReadLock();
}

@Deprecated // dirLock is obsolete, use namesystem.fsLock instead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

@Deprecated // dirLock is obsolete, use namesystem.fsLock instead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

public int getListLimit() {
  return lsLimit;
} {code}



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