[jira] [Commented] (ACCUMULO-3509) Scanner lock cause Tablet lock, hence preventing idle scans from being swept, hence blocking SimpleTimer thread

["Christopher Tubbs (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ACCUMULO-3509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15060694#comment-15060694 ] 

Christopher Tubbs commented on ACCUMULO-3509:
---------------------------------------------

Ping for update. Do you have the PR available?

> Scanner lock cause Tablet lock, hence preventing idle scans from being swept, hence blocking SimpleTimer thread 
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-3509
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3509
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.6.0
>            Reporter: marco polo
>            Assignee: marco polo
>             Fix For: 1.8.0
>
>
> Synchronization with Tablet$Scanner via a read() will block close() being called via the sweep method in TabletServer. As a result, the SimpleTimer thread does not continue, and idle threads grow until the scan completes. 
> My patch, which is forthcoming, converts synchronized methods to use a fair lock. If the lock is held by a read call, the close call will attempt to obtain it, time out, and return indicating a close was not successful. The sweep will continue, and the SimpleTimer thread will respawn later, attempting closure on those Tablets at a later time. 



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