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Posted to hdfs-dev@hadoop.apache.org by "Liang Xie (JIRA)" <ji...@apache.org> on 2014/07/23 05:14:40 UTC

[jira] [Created] (HDFS-6735) A minor optimization to avoid pread() be blocked by read() inside the same DFSInputStream

Liang Xie created HDFS-6735:
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             Summary: A minor optimization to avoid pread() be blocked by read() inside the same DFSInputStream
                 Key: HDFS-6735
                 URL: https://issues.apache.org/jira/browse/HDFS-6735
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs-client
    Affects Versions: 3.0.0
            Reporter: Liang Xie
            Assignee: Liang Xie


In current DFSInputStream impl, there're a couple of coarser-grained locks in read/pread path, and it has became a HBase read latency pain point so far. In HDFS-6698, i made a minor patch against the first encourtered lock, around getFileLength, in deed, after reading code and testing, it shows still other locks we could improve.
In this jira, i'll make a patch against other locks, and a simple test case to show the issue and the improved result.



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