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. -- This message was sent by Atlassian JIRA (v6.2#6252)