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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12025) test-patch.sh needs per-project, per-branch maven repos
Date Sat, 23 May 2015 19:56:17 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14557502#comment-14557502
] 

Allen Wittenauer commented on HADOOP-12025:
-------------------------------------------

Maven, as a caching technology, is fundamentally broken.  It provides zero locking.  Which
means that multiple maven repo operations being performed simultaneously will stomp all over
each other.  So matter what tricks one can play with the pom.xml, artifact naming, etc, it
just takes one job doing a dependency:purge-local-repository or replacing a jar while another
maven operation is running a unit tests to make everything go haywire. 

So any coordination or external locking to prevent this from happening would have be done
for every single project that runs on the same set of hosts. 

It's just easier to use docker to virtually mount different directories to prevent this from
happening.  So while there is still a risk, it's significantly reduced.

> test-patch.sh needs per-project, per-branch maven repos
> -------------------------------------------------------
>
>                 Key: HADOOP-12025
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12025
>             Project: Hadoop Common
>          Issue Type: Test
>            Reporter: Allen Wittenauer
>
> Follow-up from HADOOP-11933.



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