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https://issues.apache.org/jira/browse/ACCUMULO-4021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14966207#comment-14966207
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Josh Elser commented on ACCUMULO-4021:
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No new tests?
> bulk imports slow file garbage collection
> -----------------------------------------
>
> Key: ACCUMULO-4021
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4021
> Project: Accumulo
> Issue Type: Bug
> Components: gc
> Affects Versions: 1.6.3
> Environment: large production system
> Reporter: Eric Newton
> Assignee: Eric Newton
> Fix For: 1.6.5, 1.7.1, 1.8.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> On a large system, bulk imports slow file garbage collection to a crawl. The
> total number of files to be deleted was about 14 million. Initially, it would
> run quickly, but then slow down, to the point where only a few files would be
> deleted every few minutes. The jvm was only using 50% of the CPU (and
> therefore, probably not GC thrashing). JStacks showed the collector scanning
> the metadata table to remove referenced files from the delete list.
> If the bulk ingest requests were stopped, the GC completed quickly.
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