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https://issues.apache.org/jira/browse/MAPREDUCE-4498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425918#comment-13425918
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Alejandro Abdelnur edited comment on MAPREDUCE-4498 at 7/31/12 4:54 PM:
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It looks like we are including hsqldb in hadoop lib JARs only because of an
example. This seems wrong, the right thing to do would be to have a
lib-examples/ directory where hsqldb should live and the example should be run
using the hadoop -libjars option. By doing this we don't pollute Hadoop
classpath with unneeded runtime JARs and we don't create conflicts for projects
that use/require other versions of hsqldb.
was (Author: tucu00):
It seems looks we are including hsqldb in hadoop lib JARs only because of
an example. This seems wrong, the right thing to do would be to have a
lib-examples/ directory where hsqldb should live and the example should be run
using the hadoop -libjars option. By doing this we don't pollute Hadoop
classpath with unneeded runtime JARs and we don't create conflicts for projects
that use/require other versions of hsqldb.
> Downgrade hsqldb dependency to 1.8
> ----------------------------------
>
> 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.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
> downgrade to 1.8.x to avoid conflicts for the other projects.
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