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From "Michael Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4692) CompactionDriver leaves abandoned metadata scans
Date Fri, 04 Aug 2017 17:24:00 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16114667#comment-16114667
] 

Michael Miller commented on ACCUMULO-4692:
------------------------------------------

[~mdrob] Are you thinking of ACCUMULO-1280 ?

> 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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