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HADOOP-8050. Deadlock in metrics. Contributed by Kihwal Lee.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1291084 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Matthew Foley 2012-02-19 22:45:12 +00:00
parent 145338bc44
commit def0ac8060
2 changed files with 43 additions and 22 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -212,6 +212,8 @@ Release 0.23.2 - UNRELEASED
HADOOP-7680 TestHardLink fails on Mac OS X, when gnu stat is in path.
(Milind Bhandarkar via stevel)
HADOOP-8050. Deadlock in metrics. (Kihwal Lee via mattf)
Release 0.23.1 - 2012-02-17
INCOMPATIBLE CHANGES

27
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsSourceAdapter.java
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@ -94,9 +94,10 @@ void start() {
}
@Override
public synchronized Object getAttribute(String attribute)
public Object getAttribute(String attribute)
throws AttributeNotFoundException, MBeanException, ReflectionException {
updateJmxCache();
synchronized(this) {
Attribute a = attrCache.get(attribute);
if (a == null) {
throw new AttributeNotFoundException(attribute +" not found");
@ -106,6 +107,7 @@ public synchronized Object getAttribute(String attribute)
}
return a.getValue();
}
}
@Override
public void setAttribute(Attribute attribute)
@ -115,8 +117,9 @@ public void setAttribute(Attribute attribute)
}
@Override
public synchronized AttributeList getAttributes(String[] attributes) {
public AttributeList getAttributes(String[] attributes) {
updateJmxCache();
synchronized(this) {
AttributeList ret = new AttributeList();
for (String key : attributes) {
Attribute attr = attrCache.get(key);
@ -127,6 +130,7 @@ public synchronized AttributeList getAttributes(String[] attributes) {
}
return ret;
}
}
@Override
public AttributeList setAttributes(AttributeList attributes) {
@ -140,17 +144,32 @@ public Object invoke(String actionName, Object[] params, String[] signature)
}
@Override
public synchronized MBeanInfo getMBeanInfo() {
public MBeanInfo getMBeanInfo() {
updateJmxCache();
return infoCache;
}
private synchronized void updateJmxCache() {
private void updateJmxCache() {
boolean getAllMetrics = false;
synchronized(this) {
if (System.currentTimeMillis() - jmxCacheTS >= jmxCacheTTL) {
// temporarilly advance the expiry while updating the cache
jmxCacheTS = System.currentTimeMillis() + jmxCacheTTL;
if (lastRecs == null) {
getAllMetrics = true;
}
}
else {
return;
}
}
if (getAllMetrics) {
MetricsCollectorImpl builder = new MetricsCollectorImpl();
getMetrics(builder, true);
}
synchronized(this) {
int oldCacheSize = attrCache.size();
int newCacheSize = updateAttrCache();
if (oldCacheSize < newCacheSize) {