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HADOOP-10169. Merge change r1552820 from trunk. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1552822 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jing Zhao 2013-12-20 22:08:53 +00:00
parent 76185bf7a3
commit 68164b197b
2 changed files with 14 additions and 8 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -109,6 +109,9 @@ Release 2.4.0 - UNRELEASED
HADOOP-10164. Allow UGI to login with a known Subject (bobby)
HADOOP-10169. Remove the unnecessary synchronized in JvmMetrics class.
(Liang Xie via jing9)
OPTIMIZATIONS
HADOOP-9748. Reduce blocking on UGI.ensureInitialized (daryn)

17
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/source/JvmMetrics.java
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@ -24,10 +24,8 @@ import java.lang.management.MemoryUsage;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.lang.management.GarbageCollectorMXBean;
import java.util.Map;
import java.util.List;
import com.google.common.collect.Maps;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.log.metrics.EventCounter;
@ -67,7 +65,8 @@ public class JvmMetrics implements MetricsSource {
ManagementFactory.getGarbageCollectorMXBeans();
final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
final String processName, sessionId;
final Map<String, MetricsInfo[]> gcInfoCache = Maps.newHashMap();
final ConcurrentHashMap<String, MetricsInfo[]> gcInfoCache =
new ConcurrentHashMap<String, MetricsInfo[]>();
JvmMetrics(String processName, String sessionId) {
this.processName = processName;
@ -123,13 +122,17 @@ public class JvmMetrics implements MetricsSource {
.addCounter(GcTimeMillis, timeMillis);
}
private synchronized MetricsInfo[] getGcInfo(String gcName) {
private MetricsInfo[] getGcInfo(String gcName) {
MetricsInfo[] gcInfo = gcInfoCache.get(gcName);
if (gcInfo == null) {
gcInfo = new MetricsInfo[2];
gcInfo[0] = Interns.info("GcCount" + gcName, "GC Count for " + gcName);
gcInfo[1] = Interns.info("GcTimeMillis"+ gcName, "GC Time for "+ gcName);
gcInfoCache.put(gcName, gcInfo);
gcInfo[1] = Interns
.info("GcTimeMillis" + gcName, "GC Time for " + gcName);
MetricsInfo[] previousGcInfo = gcInfoCache.putIfAbsent(gcName, gcInfo);
if (previousGcInfo != null) {
return previousGcInfo;
}
}
return gcInfo;
}