jobhistory关注的issue

JobHistory cache issue
https://issues.apache.org/jira/browse/MAPREDUCE-6436
可能导致打印的日志太多影响性能

Job history server scans can become blocked on a single, slow entry
https://issues.apache.org/jira/browse/MAPREDUCE-6797

High contention on scanning of user directory under immediate_done in Job History Server
https://issues.apache.org/jira/browse/MAPREDUCE-6684




fatkun

折腾一下又不会死~

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