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https://issues.apache.org/jira/browse/HADOOP-5291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680269#action_12680269
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Ari Rabkin commented on HADOOP-5291:
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Hrm. I think bailing out is almost always the wrong thing. I don't want to
drive away people who are just playing with Chukwa for the first time by making
them do anything to set it up. Given that this is purely a fallback anyway
(and given that all our other scripts tie us to POSIX!) I think it's okay to
hardcode /tmp as a default.
> chukwa agent should do something sensible if CHUKWA_HOME isn't defined
> ----------------------------------------------------------------------
>
> Key: HADOOP-5291
> URL: https://issues.apache.org/jira/browse/HADOOP-5291
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/chukwa
> Reporter: Ari Rabkin
> Assignee: Ari Rabkin
> Priority: Trivial
> Attachments: fixPidFile.patch
>
>
> If Chukwa is started in such a way that CHUKWA_HOME doesn't get set, then pid
> files are stored in chukwa/null/var.... This comes up if, e.g., the agent is
> started within eclipse. We can make this case look prettier by defaulting to
> /tmp.
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