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https://issues.apache.org/jira/browse/HDFS-17390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hui Fei resolved HDFS-17390.
----------------------------
Resolution: Fixed
> [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
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
>
> {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 @Deprecated // dirLock is obsolete, use namesystem.fsLock instead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 @Deprecated // dirLock is obsolete, use namesystem.fsLock instead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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