[jira] [Commented] (HBASE-5672) TestLruBlockCache#testBackgroundEvictionThread fails occasionally

["stack (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-5672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244343#comment-13244343 ] 

stack commented on HBASE-5672:
------------------------------

bq. I think Thread.isAlive returns true if we have called Thread.start(),however, Thread.run() haven't been executed at that time.

That may be so (I've not looked at source).  Do you want to have a flag in the Thread that gets set when you enter the run method and check that too?

The above would still be better than a timed wait.
                
> TestLruBlockCache#testBackgroundEvictionThread fails occasionally
> -----------------------------------------------------------------
>
>                 Key: HBASE-5672
>                 URL: https://issues.apache.org/jira/browse/HBASE-5672
>             Project: HBase
>          Issue Type: Bug
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>         Attachments: HBASE-5672.patch
>
>
> We find TestLruBlockCache#testBackgroundEvictionThread fails occasionally.
> I think it's a problem of the test case.
> Because runEviction() only do evictionThread.evict():
> {code}
> public void evict() {
>       synchronized(this) {
>         this.notify(); // FindBugs NN_NAKED_NOTIFY
>       }
>     }
> {code}
> However when we call evictionThread.evict(), the evictionThread may haven't been in run() in the TestLruBlockCache#testBackgroundEvictionThread.
> If we run the test many times, we could find failture easily.

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