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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8026) Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk
Date Thu, 02 Apr 2015 00:04:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391820#comment-14391820

Colin Patrick McCabe commented on HDFS-8026:

I'm not sure if there is an open jira about TestTracing being flaky.  The ones that I'm familiar
with (and can find in a quick search) have already been resolved.  We can open a new one if
it keeps re-occurring.  In the meantime, I put it down to the usual jenkins flakiness.  Hopefully
the new test-patch.sh will resolve some of these issues...

> 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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