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Posted to dev@accumulo.apache.org by "Keith Turner (Updated) (JIRA)" <ji...@apache.org> on 2012/01/11 19:41:38 UTC

[jira] [Updated] (ACCUMULO-97) !METADATA scans could be delayed by regular scans

     [ https://issues.apache.org/jira/browse/ACCUMULO-97?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Keith Turner updated ACCUMULO-97:
---------------------------------

    Fix Version/s: 1.5.0
    
> !METADATA scans could be delayed by regular scans
> -------------------------------------------------
>
>                 Key: ACCUMULO-97
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-97
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>             Fix For: 1.5.0
>
>
> The tablet server only allows scans to open a max number of files.  Once the max is reached, scans wait.  Its possible that a !METADATA scan could get stuck waiting for a long running non !METADATA scan to release files.  This could slow down the whole system.  !METADATA scans wold not starve because a fair semaphore is used.  However with client timeouts, starvation may be possible.

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