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From "Wiktor N (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (JCS-171) Multiple CacheEventQueue.QProcessor spawned for the same cache region
Date Tue, 10 Jan 2017 22:51:58 GMT

     [ https://issues.apache.org/jira/browse/JCS-171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wiktor N updated JCS-171:
-------------------------
    Attachment: jcs-perf-test.zip

> Multiple CacheEventQueue.QProcessor spawned for the same cache region
> ---------------------------------------------------------------------
>
>                 Key: JCS-171
>                 URL: https://issues.apache.org/jira/browse/JCS-171
>             Project: Commons JCS
>          Issue Type: Bug
>          Components: Composite Cache
>    Affects Versions: jcs-2.0
>            Reporter: Wiktor N
>            Assignee: Thomas Vandahl
>             Fix For: jcs-2.1
>
>         Attachments: CacheEventQueue.patch, jcs-perf-test.zip
>
>
> I noticed that running on new version of JCS I get multiple CacheEventQueue.QProcessor
thread. They spawn from time to time.
> I've checked recent changes and changes few things in r1774925 look suspicious:
> 1. In previous code we spawned a new thread in synchronized section. This got us a guarantee,
that there will be no two threads trying to spawn a new thread in the same time. Maybe some
locking is needed around thread creation?
> 2. QProcessor uses isAlive() method. But this is defined by Thread.isAlive() while it
should probably check for CacheEventQueue.this.isAlive()



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