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Posted to hdfs-issues@hadoop.apache.org by "Liang Xie (JIRA)" <ji...@apache.org> on 2014/07/23 05:53:39 UTC

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

     [ https://issues.apache.org/jira/browse/HDFS-6735?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liang Xie updated HDFS-6735:
----------------------------

    Status: Patch Available  (was: Open)

> 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
>         Attachments: HDFS-6735.txt
>
>
> 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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