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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7602) TestFromClientSide.testPoolBehavior is incorrect
Date Thu, 17 Jan 2013 06:46:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-7602:
---------------------------------

    Attachment: 7602-0.94.txt

0.94 patch
                
> TestFromClientSide.testPoolBehavior is incorrect
> ------------------------------------------------
>
>                 Key: HBASE-7602
>                 URL: https://issues.apache.org/jira/browse/HBASE-7602
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.0, 0.94.5
>
>         Attachments: 7602-0.94.txt
>
>
> The writer of this test misunderstood ThreadPoolExecutor.
> The test adds Threads as tasks to a ThreadPoolExecutor and then calls join on the Thread
objects. But these are not the running threads, it work by pure accident, because Thread happens
to implement Runnable.
> {code}
> pool.submit(threads.get(0));
> ...
> threads.get(0).join();
> {code}
> The join will always return immediately, because the thread never ran.
> This should instead synchronize on the Future returned from submit instead, otherwise
there is no guarantee that the threads in the pool actually finished.

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