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https://issues.apache.org/jira/browse/ACCUMULO-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196745#comment-14196745
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Josh Elser commented on ACCUMULO-3297:
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Great find, [~phrocker]! Gave it a quick look and I agree with your assessment.
We have (at least) one other place where resources for metadata are just used.
Long term, we should make separate resource mgmt for metadata/root instead of
just blindly using them, but this should help in the meantime.
> FileManager semaphore acquisition may block Root and Metadata scans
> -------------------------------------------------------------------
>
> Key: ACCUMULO-3297
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3297
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Affects Versions: 1.6.1
> Environment: Tserver
> Reporter: marco polo
> Fix For: 1.6.2
>
>
> FileManager.java contains a semaphore to limit the max open files when
> calling acquireUninterruptibly( # permits ) when opening the readers. If
> scans against all tables causes the number of max open permits to exceed the
> configured system property, scans against the metadata and root extents will
> block until other readers are released.
> This should be changed so that scans against the root and metadata extents
> proceed, despite exceeding the number of max open files. This likely means
> bypassing the semaphore acquisition for these tablets.
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