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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8026) Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk
Date Wed, 01 Apr 2015 22:12:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391589#comment-14391589
] 

Hudson commented on HDFS-8026:
------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #7488 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/7488/])
HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk
(cmccabe) (cmccabe: rev c94d594a57806dec515e2a2053a1221f8ce48cc4)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FSOutputSummer.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tracing/TestTracing.java


> 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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