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

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1291081 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Matthew Foley 2012-02-19 22:39:50 +00:00
parent 1705035963
commit 197d6d34ca
2 changed files with 43 additions and 22 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
View File

@ -60,6 +60,8 @@ 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

63
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsSourceAdapter.java
View File

@ -94,17 +94,19 @@ class MetricsSourceAdapter implements DynamicMBean {
}
@Override
public synchronized Object getAttribute(String attribute)
public Object getAttribute(String attribute)
throws AttributeNotFoundException, MBeanException, ReflectionException {
updateJmxCache();
Attribute a = attrCache.get(attribute);
if (a == null) {
throw new AttributeNotFoundException(attribute +" not found");
synchronized(this) {
Attribute a = attrCache.get(attribute);
if (a == null) {
throw new AttributeNotFoundException(attribute +" not found");
}
if (LOG.isDebugEnabled()) {
LOG.debug(attribute +": "+ a);
}
return a.getValue();
}
if (LOG.isDebugEnabled()) {
LOG.debug(attribute +": "+ a);
}
return a.getValue();
}
@Override
@ -115,17 +117,19 @@ class MetricsSourceAdapter implements DynamicMBean {
}
@Override
public synchronized AttributeList getAttributes(String[] attributes) {
public AttributeList getAttributes(String[] attributes) {
updateJmxCache();
AttributeList ret = new AttributeList();
for (String key : attributes) {
Attribute attr = attrCache.get(key);
if (LOG.isDebugEnabled()) {
LOG.debug(key +": "+ attr);
synchronized(this) {
AttributeList ret = new AttributeList();
for (String key : attributes) {
Attribute attr = attrCache.get(key);
if (LOG.isDebugEnabled()) {
LOG.debug(key +": "+ attr);
}
ret.add(attr);
}
ret.add(attr);
return ret;
}
return ret;
}
@Override
@ -140,17 +144,32 @@ class MetricsSourceAdapter implements DynamicMBean {
}
@Override
public synchronized MBeanInfo getMBeanInfo() {
public MBeanInfo getMBeanInfo() {
updateJmxCache();
return infoCache;
}
private synchronized void updateJmxCache() {
if (System.currentTimeMillis() - jmxCacheTS >= jmxCacheTTL) {
if (lastRecs == null) {
MetricsCollectorImpl builder = new MetricsCollectorImpl();
getMetrics(builder, true);
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) {