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Date: Mon, 11 Jan 2016 19:25:40 +0000 (UTC)
From: "Josh Elser (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (ACCUMULO-3509) Scanner lock cause Tablet lock,
 hence preventing idle scans from being swept, hence blocking SimpleTimer
 thread
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    [ https://issues.apache.org/jira/browse/ACCUMULO-3509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092526#comment-15092526 ] 

Josh Elser commented on ACCUMULO-3509:
--------------------------------------

I will run this through some ITs and then merge today. Thanks in advance, [~phrocker]!

> 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: 1.6.5, 1.7.1, 1.8.0
>
>         Attachments: ACCUMULO-3509-1.6.patch
>
>
> 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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