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Posted to hdfs-issues@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2015/04/02 01:12:56 UTC

[jira] [Updated] (HDFS-8026) Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk

     [ https://issues.apache.org/jira/browse/HDFS-8026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe updated HDFS-8026:
---------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.8.0
           Status: Resolved  (was: Patch Available)

> Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk
> -------------------------------------------------------------------------------
>
>                 Key: HDFS-8026
>                 URL: https://issues.apache.org/jira/browse/HDFS-8026
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>             Fix For: 2.8.0
>
>         Attachments: HDFS-8026.001.patch
>
>
> We should trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk.  When tracing writeChunk, we get a new trace span every 512 bytes; when tracing writeChecksumChunks, we normally get a new trace span only when the FSOutputSummer buffer is full (9x less often.)



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