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https://issues.apache.org/jira/browse/ACCUMULO-2532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13947388#comment-13947388
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ASF subversion and git services commented on ACCUMULO-2532:
-----------------------------------------------------------

Commit 9678a2c51a33cc8c58969450e81c0acf40714930 in accumulo's branch 
refs/heads/master from [~elserj]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=9678a2c ]

ACCUMULO-2532 Expand on comment as to why we create this (otherwise curious) 
file


> FileUtil expects instance.dfs.dir in tmpDir path
> ------------------------------------------------
>
>                 Key: ACCUMULO-2532
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2532
>             Project: Accumulo
>          Issue Type: Sub-task
>          Components: master, tserver
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Critical
>             Fix For: 1.6.0
>
>
> FileUtil#cleanupIndexOp(AccumuloConfiguration, Path, VolumeManager, 
> ArrayList) checks that the temporary directory Path it was given ends with 
> the value of instance.dfs.dir and "/tmp".
> instance.dfs.dir is no longer appended to each volume, so this check is 
> likely wrong and result in tmp directories not being cleaned up properly.
> This also necessitates a unit test to prevent from happening again.



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