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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8026) Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk
Date Tue, 31 Mar 2015 02:04:52 GMT

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

Colin Patrick McCabe updated HDFS-8026:
---------------------------------------
    Attachment: HDFS-8026.001.patch

> 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
>         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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