Accesses to CompletedJobStore should not lock the JobTracker.
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Key: HADOOP-4375
URL: https://issues.apache.org/jira/browse/HADOOP-4375
Project: Hadoop Core
Issue Type: Bug
Reporter: Vinod K V
When CompletedJobStatusStore is configured to use dfs, it can cause lockup of
JT due to inline dfs access.
For e.g.
{code}
public synchronized JobStatus getJobStatus(JobID jobid) {
JobInProgress job = jobs.get(jobid);
if (job != null) {
return job.getStatus();
} else {
return completedJobStatusStore.readJobStatus(jobid);
}
}
{code}
Instead, JT should be locked only when accessing its internal memory
structures. The other such methods are JobTracker.getJobCounters,
JobTracker.getJobProfile and JobTracker.finalizeJob.
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