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HDFS-10798. Make the threshold of reporting FSNamesystem lock contention configurable. Contributed by Erik Krogen. 

(cherry picked from commit 407b519fb1)
This commit is contained in:
Zhe Zhang 2016-08-26 14:19:55 -07:00
parent 442dfd1bbe
commit f3a4cbcc60
4 changed files with 31 additions and 8 deletions
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5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
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@ -384,6 +384,11 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
public static final long
DFS_NAMENODE_MAX_LOCK_HOLD_TO_RELEASE_LEASE_MS_DEFAULT = 25;
// Threshold for how long a write lock must be held for the event to be logged
public static final String DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY =
"dfs.namenode.write-lock-reporting-threshold-ms";
public static final long DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT = 1000L;
public static final String DFS_UPGRADE_DOMAIN_FACTOR = "dfs.namenode.upgrade.domain.factor";
public static final int DFS_UPGRADE_DOMAIN_FACTOR_DEFAULT = DFS_REPLICATION_DEFAULT;

10
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@ -71,6 +71,8 @@ import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_MAX_OBJECTS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RESOURCE_CHECK_INTERVAL_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RESOURCE_CHECK_INTERVAL_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RETRY_CACHE_EXPIRYTIME_MILLIS_DEFAULT;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RETRY_CACHE_EXPIRYTIME_MILLIS_KEY;
import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RETRY_CACHE_HEAP_PERCENT_DEFAULT;
@ -807,6 +809,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
DFS_NAMENODE_MAX_LOCK_HOLD_TO_RELEASE_LEASE_MS_KEY,
DFS_NAMENODE_MAX_LOCK_HOLD_TO_RELEASE_LEASE_MS_DEFAULT);
this.writeLockReportingThreshold = conf.getLong(
DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY,
DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_DEFAULT);
// For testing purposes, allow the DT secret manager to be started regardless
// of whether security is enabled.
alwaysUseDelegationTokensForTests = conf.getBoolean(
@ -1486,7 +1492,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
}
/** Threshold (ms) for long holding write lock report. */
static final short WRITELOCK_REPORTING_THRESHOLD = 1000;
private long writeLockReportingThreshold;
/** Last time stamp for write lock. Keep the longest one for multi-entrance.*/
private long writeLockHeldTimeStamp;
@ -1520,7 +1526,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
this.fsLock.writeLock().unlock();
if (needReport && writeLockInterval >= WRITELOCK_REPORTING_THRESHOLD) {
if (needReport && writeLockInterval >= this.writeLockReportingThreshold) {
LOG.info("FSNamesystem write lock held for " + writeLockInterval +
" ms via\n" + StringUtils.getStackTrace(Thread.currentThread()));
}

9
hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
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@ -2626,6 +2626,15 @@
</description>
</property>
<property>
<name>dfs.namenode.write-lock-reporting-threshold-ms</name>
<value>1000</value>
<description>When a write lock is held on the namenode for a long time,
this will be logged as the lock is released. This sets how long the
lock must be held for logging to occur.
</description>
</property>
<property>
<name>dfs.namenode.startup.delay.block.deletion.sec</name>
<value>0</value>

15
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSNamesystem.java
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@ -290,7 +290,10 @@ public class TestFSNamesystem {
*/
@Test(timeout=45000)
public void testFSLockLongHoldingReport() throws Exception {
final long writeLockReportingThreshold = 100L;
Configuration conf = new Configuration();
conf.setLong(DFSConfigKeys.DFS_NAMENODE_WRITE_LOCK_REPORTING_THRESHOLD_MS_KEY,
writeLockReportingThreshold);
FSImage fsImage = Mockito.mock(FSImage.class);
FSEditLog fsEditLog = Mockito.mock(FSEditLog.class);
Mockito.when(fsImage.getEditLog()).thenReturn(fsEditLog);
@ -301,32 +304,32 @@ public class TestFSNamesystem {
// Don't report if the write lock is held for a short time
fsn.writeLock();
Thread.sleep(FSNamesystem.WRITELOCK_REPORTING_THRESHOLD / 2);
Thread.sleep(writeLockReportingThreshold / 2);
fsn.writeUnlock();
assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));
// Report if the write lock is held for a long time
fsn.writeLock();
Thread.sleep(FSNamesystem.WRITELOCK_REPORTING_THRESHOLD + 100);
Thread.sleep(writeLockReportingThreshold + 10);
logs.clearOutput();
fsn.writeUnlock();
assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName()));
// Report if the write lock is held (interruptibly) for a long time
fsn.writeLockInterruptibly();
Thread.sleep(FSNamesystem.WRITELOCK_REPORTING_THRESHOLD + 100);
Thread.sleep(writeLockReportingThreshold + 10);
logs.clearOutput();
fsn.writeUnlock();
assertTrue(logs.getOutput().contains(GenericTestUtils.getMethodName()));
// Report if it's held for a long time when re-entering write lock
fsn.writeLock();
Thread.sleep(FSNamesystem.WRITELOCK_REPORTING_THRESHOLD / 2 + 1);
Thread.sleep(writeLockReportingThreshold/ 2 + 1);
fsn.writeLockInterruptibly();
Thread.sleep(FSNamesystem.WRITELOCK_REPORTING_THRESHOLD / 2 + 1);
Thread.sleep(writeLockReportingThreshold / 2 + 1);
fsn.writeLock();
Thread.sleep(FSNamesystem.WRITELOCK_REPORTING_THRESHOLD / 2);
Thread.sleep(writeLockReportingThreshold / 2);
logs.clearOutput();
fsn.writeUnlock();
assertFalse(logs.getOutput().contains(GenericTestUtils.getMethodName()));