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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-3297) FileManager semaphore acquisition may block Root and Metadata scans
Date Wed, 05 Nov 2014 12:39:33 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christopher Tubbs updated ACCUMULO-3297:
----------------------------------------
    Fix Version/s: 1.7.0

> 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, 1.7.0
>
>
> 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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