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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-579) Streaming "slowmatch" documentation
Date Wed, 25 Mar 2015 14:39:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379971#comment-14379971
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Hudson commented on MAPREDUCE-579:
----------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #134 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/134/])
MAPREDUCE-579. Streaming slowmatch documentation. (harsh: rev b6dea9776b92c46d2ca593f7ada0a3b5dfdc2e04)
* hadoop-mapreduce-project/CHANGES.txt
* hadoop-tools/hadoop-streaming/src/site/markdown/HadoopStreaming.md.vm


> Streaming "slowmatch" documentation
> -----------------------------------
>
>                 Key: MAPREDUCE-579
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-579
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/streaming
>    Affects Versions: 2.6.0
>            Reporter: Bo Adler
>            Assignee: Harsh J
>            Priority: Trivial
>             Fix For: 2.8.0
>
>         Attachments: MAPREDUCE-579.patch
>
>
> The documentation for the Streaming module do not include any mention of the "slowmatch"
parameter, which checks for CDATA sections while looking for XML records.
> An important point is that "slowmatch=true" violates the principle of least surprise:
the "begin" and "end" parameters become regular expressions instead of exact strings.  This
is probably a useful feature, but should definitely be noted since users will be tempted to
use the XML record reader on not-strictly-xml files, which may require escaping the "begin"
and "end" patterns.



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