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https://issues.apache.org/jira/browse/ACCUMULO-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16114590#comment-16114590
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Michael Miller commented on ACCUMULO-4692:
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What version you see this in?
> CompactionDriver leaves abandoned metadata scans
> ------------------------------------------------
>
> Key: ACCUMULO-4692
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4692
> Project: Accumulo
> Issue Type: Bug
> Components: fate
> Reporter: Adam Fuchs
>
> We wrote a tool to kick off tablet compactions in the background while
> minimizing compaction load per-server. The tool uses range compaction on one
> tablet per call. We're seeing a high number of scans on the metadata table
> (~7,000 on a ~100 node cluster).
> The metadata query in the isReady() method of CompactionDriver that is used
> to see if the compaction has completed uses a range that goes to the end of
> the metadata entries for the given table, but it stops consuming the results
> of the scanner at the end of the compaction range. isReady gets called in a
> pretty tight loop, especially with hundreds of compactions running
> concurrently. Seems like we should limit the scan to the metadata range
> associated with the compaction so that the scan can get cleaned up quickly.
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