[jboss-jira] [JBoss JIRA] (JGRP-1912) LockService can fail under heavy load

[Chris Gentile (JIRA)]

     [ https://issues.jboss.org/browse/JGRP-1912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Gentile updated JGRP-1912:
--------------------------------
    Attachment: logFile2


Here is another run.
This run has a lock timeout of 60 seconds.

About 4 seconds into the test (test duration is two minutes), one of the 10 threads tries to get a lock on one of the two items.
This attempt gets a timeout 60 seconds later, and the SEVERE message is recorded.

During the time that this thread is waiting, the other threads are continuing to acquire and release locks on both items.

I don't think it matters how long the timeout is, this blocked thread is never going to succeed on this tryLock() call.

After the timeout occurs, the thread continues normally to acquire and release locks on both items.

> LockService can fail under heavy load
> -------------------------------------
>
>                 Key: JGRP-1912
>                 URL: https://issues.jboss.org/browse/JGRP-1912
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 3.6.1
>         Environment: both windows 8.1 and RHEL
> java 1.7.0_75
>            Reporter: Chris Gentile
>            Assignee: Bela Ban
>             Fix For: 3.6.3
>
>         Attachments: LockServiceTestClient.java, LockServiceTestClient.java, logFile, logFile2, runLockServiceTestClient.sh, udp.xml
>
>
> Once in awhile, the LockService will get stuck acquiring a lock.
> These seems to occur most often when two threads are simultaneously trying to acquire the same lock. (i.e.:  exact same millisecond on a server with multiple processors).



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