[infinispan-issues] [JBoss JIRA] (ISPN-2602) Busy wait in BaseStateTransferManagerImpl#waitForStateTransferToStart

[Dan Berindei (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-2602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Berindei resolved ISPN-2602.
--------------------------------

    Fix Version/s: 5.2.0.Final
                       (was: 6.0.0.Final)
       Resolution: Out of Date


The new state transfer in 5.2 doesn't use this busy wait loop any more - instead it uses a CountDownLatch.
                
> Busy wait in BaseStateTransferManagerImpl#waitForStateTransferToStart
> ---------------------------------------------------------------------
>
>                 Key: ISPN-2602
>                 URL: https://issues.jboss.org/browse/ISPN-2602
>             Project: Infinispan
>          Issue Type: Bug
>          Components: State transfer
>    Affects Versions: 5.1.4.FINAL
>            Reporter: Dennis Reed
>            Assignee: Mircea Markus
>            Priority: Minor
>             Fix For: 5.2.0.Final
>
>
> BaseStateTransferManagerImpl#waitForStateTransferToStart does a busy wait, sleeping for 10ms in between checking the condition, instead of synchronizing using condition variables (or the equivalent).
> This can cause excessive CPU load if a lot of threads are waiting
> (we have seen 300 threads waiting in this loop at once).

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