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HDFS-5514. FSNamesystem's fsLock should allow custom implementation (daryn)

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548161 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Daryn Sharp 2013-12-05 15:28:12 +00:00
parent aa4fba6d92
commit 6828337d85
3 changed files with 42 additions and 4 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -457,6 +457,8 @@ Release 2.4.0 - UNRELEASED
HDFS-5444. Choose default web UI based on browser capabilities. (Haohui Mai
via jing9)
HDFS-5514. FSNamesystem's fsLock should allow custom implementation (daryn)
IMPROVEMENTS
HDFS-5267. Remove volatile from LightWeightHashSet. (Junping Du via llu)

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -467,7 +467,7 @@ private void logAuditEvent(boolean succeeded,
private final long accessTimePrecision;
/** Lock to protect FSNamesystem. */
private ReentrantReadWriteLock fsLock;
private FSNamesystemLock fsLock;
/**
* Used when this NN is in standby state to read from the shared edit log.
@ -650,7 +650,7 @@ public static FSNamesystem loadFromDisk(Configuration conf)
throws IOException {
boolean fair = conf.getBoolean("dfs.namenode.fslock.fair", true);
LOG.info("fsLock is fair:" + fair);
fsLock = new ReentrantReadWriteLock(fair);
fsLock = new FSNamesystemLock(fair);
try {
resourceRecheckInterval = conf.getLong(
DFS_NAMENODE_RESOURCE_CHECK_INTERVAL_KEY,
@ -6771,12 +6771,12 @@ public void setEditLogTailerForTests(EditLogTailer tailer) {
@VisibleForTesting
void setFsLockForTests(ReentrantReadWriteLock lock) {
this.fsLock = lock;
this.fsLock.coarseLock = lock;
}
@VisibleForTesting
ReentrantReadWriteLock getFsLockForTests() {
return fsLock;
return fsLock.coarseLock;
}
@VisibleForTesting

36
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
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@ -158,4 +158,40 @@ public void testFsLockFairness() throws IOException, InterruptedException{
fsNamesystem = new FSNamesystem(conf, fsImage);
assertFalse(fsNamesystem.getFsLockForTests().isFair());
}
@Test
public void testFSNamesystemLockCompatibility() {
FSNamesystemLock rwLock = new FSNamesystemLock(true);
assertEquals(0, rwLock.getReadHoldCount());
rwLock.readLock().lock();
assertEquals(1, rwLock.getReadHoldCount());
rwLock.readLock().lock();
assertEquals(2, rwLock.getReadHoldCount());
rwLock.readLock().unlock();
assertEquals(1, rwLock.getReadHoldCount());
rwLock.readLock().unlock();
assertEquals(0, rwLock.getReadHoldCount());
assertFalse(rwLock.isWriteLockedByCurrentThread());
assertEquals(0, rwLock.getWriteHoldCount());
rwLock.writeLock().lock();
assertTrue(rwLock.isWriteLockedByCurrentThread());
assertEquals(1, rwLock.getWriteHoldCount());
rwLock.writeLock().lock();
assertTrue(rwLock.isWriteLockedByCurrentThread());
assertEquals(2, rwLock.getWriteHoldCount());
rwLock.writeLock().unlock();
assertTrue(rwLock.isWriteLockedByCurrentThread());
assertEquals(1, rwLock.getWriteHoldCount());
rwLock.writeLock().unlock();
assertFalse(rwLock.isWriteLockedByCurrentThread());
assertEquals(0, rwLock.getWriteHoldCount());
}
}