Jobtracker history should be done written aysnchronously to the filesystem
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Key: MAPREDUCE-786
URL: https://issues.apache.org/jira/browse/MAPREDUCE-786
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Sharad Agarwal
Jobtracker lock is held while writing the history events. This makes the
jobtracker slow on flushes, especially when history is written to HDFS. History
events should be written asynchronously to avoid this problem.
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