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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-97) !METADATA scans could be delayed by regular scans
Date Thu, 06 Nov 2014 21:04:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14200920#comment-14200920
] 

Eric Newton commented on ACCUMULO-97:
-------------------------------------

[~ctubbsii] the root table didn't make it any worse.

> !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
>
> 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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