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https://issues.apache.org/jira/browse/PIG-148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12578379#action_12578379
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Olga Natkovich commented on PIG-148:
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They things only get rebuild if their dependencies changed which is the
semantics we want to preserve.
> Some of the building steps might better be skipped if possible when running
> the Pig unit test
> ---------------------------------------------------------------------------------------------
>
> Key: PIG-148
> URL: https://issues.apache.org/jira/browse/PIG-148
> Project: Pig
> Issue Type: Improvement
> Reporter: Xu Zhang
>
> We may want to skip some of the building steps currently involved in running
> the Pig unit test with "ant test" to shorten the total time when possible.
> Presently, the build script spends long time on the init, compile-sources,
> and buildJar steps even when the test class and the jar files have already
> been built successfully before. Could we add a check in build.xml to skip
> those steps if the class and/or jar files already exist? If the use wants to
> re-build those files when running the unit test, they can first invoke "ant
> clean" which should be implemented in such a way that it cleanly removes
> those files.
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