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https://issues.apache.org/jira/browse/ACCUMULO-4016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941522#comment-14941522
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Eric Newton commented on ACCUMULO-4016:
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ACCUMULO-2292 modified TraceRunnable to forward equals to compareTo. The
compareTo on CompactionRunner will return 0 when the objects are not the same.
Therefore, the CompactionRunner, wrapped by a TraceRunnable would use compareTo
to remove objects from the queue. If the number of files in a tablet changed
due to bulk import, the remove might remove the wrong object.
Thanks to [~kturner] for finding this little gem.
This may also be another cause for ACCUMULO-3462.
> compaction queued, but not running
> ----------------------------------
>
> Key: ACCUMULO-4016
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4016
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Affects Versions: 1.5.4, 1.6.3, 1.6.4, 1.7.0
> Reporter: Eric Newton
> Assignee: Eric Newton
> Priority: Critical
> Fix For: 1.6.5, 1.7.1
>
>
> Monitor is showing zero compactions running but some queued for long periods
> of time.
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