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HDFS-5239. Allow FSNamesystem lock fairness to be configurable (daryn) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1525624 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Daryn Sharp 2013-09-23 15:27:08 +00:00
parent 3175cf17c7
commit 3dfadca6f5
3 changed files with 24 additions and 3 deletions
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2
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -288,6 +288,8 @@ Release 2.3.0 - UNRELEASED
OPTIMIZATIONS
HDFS-5239. Allow FSNamesystem lock fairness to be configurable (daryn)
BUG FIXES
HDFS-5034. Remove debug prints from GetFileLinkInfo (Andrew Wang via Colin
Patrick McCabe)

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -435,7 +435,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
private final long accessTimePrecision;
/** Lock to protect FSNamesystem. */
private ReentrantReadWriteLock fsLock = new ReentrantReadWriteLock(true);
private ReentrantReadWriteLock fsLock;
/**
* Used when this NN is in standby state to read from the shared edit log.
@ -610,6 +610,9 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
*/
FSNamesystem(Configuration conf, FSImage fsImage, boolean ignoreRetryCache)
throws IOException {
boolean fair = conf.getBoolean("dfs.namenode.fslock.fair", true);
LOG.info("fsLock is fair:" + fair);
fsLock = new ReentrantReadWriteLock(fair);
try {
resourceRecheckInterval = conf.getLong(
DFS_NAMENODE_RESOURCE_CHECK_INTERVAL_KEY,

20
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
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@ -20,8 +20,7 @@ package org.apache.hadoop.hdfs.server.namenode;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.*;
import java.io.File;
import java.io.IOException;
@ -142,4 +141,21 @@ public class TestFSNamesystem {
assertTrue("Replication queues weren't being populated after entering "
+ "safemode 2nd time", fsn.isPopulatingReplQueues());
}
@Test
public void testFsLockFairness() throws IOException, InterruptedException{
Configuration conf = new Configuration();
FSEditLog fsEditLog = Mockito.mock(FSEditLog.class);
FSImage fsImage = Mockito.mock(FSImage.class);
Mockito.when(fsImage.getEditLog()).thenReturn(fsEditLog);
conf.setBoolean("dfs.namenode.fslock.fair", true);
FSNamesystem fsNamesystem = new FSNamesystem(conf, fsImage);
assertTrue(fsNamesystem.getFsLockForTests().isFair());
conf.setBoolean("dfs.namenode.fslock.fair", false);
fsNamesystem = new FSNamesystem(conf, fsImage);
assertFalse(fsNamesystem.getFsLockForTests().isFair());
}
}