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Posted to hdfs-dev@hadoop.apache.org by "Weiwei Yang (JIRA)" <ji...@apache.org> on 2017/10/24 12:09:00 UTC

[jira] [Created] (HDFS-12701) More fine-grained locks in ShortCircuitCache

Weiwei Yang created HDFS-12701:
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             Summary: More fine-grained locks in ShortCircuitCache
                 Key: HDFS-12701
                 URL: https://issues.apache.org/jira/browse/HDFS-12701
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 2.8.1
            Reporter: Weiwei Yang


When cluster is heavily loaded, we found HBase regionserver handlers are often blocked by {{ShortCircuitCache}}. Dumped jstack and found more lots of thread waiting on obtain the cache lock. It should be able to be improved by using more fine-grained locks to improve the performance.



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