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https://issues.apache.org/jira/browse/HADOOP-16110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767699#comment-16767699
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Steve Loughran commented on HADOOP-16110:
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thoughts [~aw]?
Spent a while trying to track this little quirk down
> ~/hadoop-env doesn't support HADOOP_OPTIONAL_TOOLS
> --------------------------------------------------
>
> Key: HADOOP-16110
> URL: https://issues.apache.org/jira/browse/HADOOP-16110
> Project: Hadoop Common
> Issue Type: Bug
> Components: bin
> Affects Versions: 3.3.0
> Reporter: Steve Loughran
> Priority: Minor
>
> if you set {{HADOOP_OPTIONAL_TOOLS}} in ~.hadoop-env, it doesn't get picked
> up because the HADOOP_OPTIONAL_TOOLS expansion takes place in the parse
> process way before {{hadoop_exec_user_hadoopenv}} is invoked.
> Unless I've really misunderstood what ~/.hadoop-env is meant to do "let me
> set hadoop env vars", I'd have expected that tools env var examining (and so:
> loading of optional tools) to take place after
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