Ted Yu created MAPREDUCE-5861:
---------------------------------
Summary: LocalContainerLauncher does not atomically update
volatile variable finishedSubMaps
Key: MAPREDUCE-5861
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5861
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Ted Yu
Priority: Minor
Around line 374:
{code}
if (++finishedSubMaps == numMapTasks) {
doneWithMaps = true;
}
{code}
The increment of finishedSubMaps is not atomic.
See the answer to
http://stackoverflow.com/questions/9749746/what-is-the-difference-of-atomic-volatile-synchronize
.
AtomicInteger can be used to achieve atomicity.
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