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https://issues.apache.org/jira/browse/MAPREDUCE-4498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426086#comment-13426086
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Robert Kanter commented on MAPREDUCE-4498:
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The only documentation I could find is in the javadoc comments for the
DBCountPageView and the printout when you run the examples jar without
specifying which example. I'll update the patch to add the instructions on how
to run dbcount.
> Remove hsqldb jar from Hadoop runtime classpath
> -----------------------------------------------
>
> Key: MAPREDUCE-4498
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4498
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: build, examples
> Affects Versions: 2.2.0-alpha
> Reporter: Robert Kanter
> Assignee: Robert Kanter
> Priority: Critical
> Fix For: 2.2.0-alpha
>
> Attachments: MAPREDUCE-4498-v2.patch, MAPREDUCE-4498.patch
>
>
> The hsqldb jar is included in hadoop for the DBCountPageView example only.
> Currently the example is using hsqldb version 2.x; however, 2.x is
> incompatible with 1.8.x -- having this jar in the hadoop class path conflicts
> with dependent projects like Oozie, Hive, and Pig which still use 1.8.x. As
> there are no features hsqldb 2.x that are used by the example, we should
> remove it from Hadoop's runtime classpath.
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