Apache
/
hadoop
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

HADOOP-11361. Fix a race condition in MetricsSourceAdapter.updateJmxCache. Contributed by Brahma Reddy Battula. 

(cherry picked from commit 4356e8a5ef)
This commit is contained in:
Tsuyoshi Ozawa 2015-05-14 10:20:45 +09:00
parent 3a11baa15f
commit 9f89c6656e
2 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
hadoop-common-project/hadoop-common/CHANGES.txt
View File

@ -212,6 +212,9 @@ Release 2.8.0 - UNRELEASED
HADOOP-11962. Sasl message with MD5 challenge text shouldn't be LOG out
even in debug level. (Junping Du via wheat9)
HADOOP-11361. Fix a race condition in MetricsSourceAdapter.updateJmxCache.
(Brahma Reddy Battula via ozawa)
Release 2.7.1 - UNRELEASED
INCOMPATIBLE CHANGES

7
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsSourceAdapter.java
View File

@ -154,25 +154,22 @@ class MetricsSourceAdapter implements DynamicMBean {
private void updateJmxCache() {
boolean getAllMetrics = false;
synchronized(this) {
synchronized (this) {
if (Time.now() - jmxCacheTS >= jmxCacheTTL) {
// temporarilly advance the expiry while updating the cache
jmxCacheTS = Time.now() + jmxCacheTTL;
if (lastRecs == null) {
getAllMetrics = true;
}
}
else {
} else {
return;
}
}
if (getAllMetrics) {
MetricsCollectorImpl builder = new MetricsCollectorImpl();
getMetrics(builder, true);
}
synchronized(this) {
updateAttrCache();
if (getAllMetrics) {
updateInfoCache();