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From "He Liangliang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9422) Unnecessary FsDatasetImpl locking in DirectoryScanner cause periodic datanode pauses
Date Fri, 13 Nov 2015 05:59:11 GMT
He Liangliang created HDFS-9422:
-----------------------------------

             Summary: Unnecessary FsDatasetImpl locking in DirectoryScanner cause periodic
datanode pauses
                 Key: HDFS-9422
                 URL: https://issues.apache.org/jira/browse/HDFS-9422
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: He Liangliang
            Assignee: He Liangliang


In DirectoryScanner, the scan call hold the global dataset lock for quite long time (typically
> 5 secs for 500k blocks). This will stuck the client which need acquire this lock. For
applications like HBase, this will affect the latency. In fact, this lock is unnecessary.



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