[jboss-jira] [JBoss JIRA] Updated: (JGRP-1239) Spurious warning "unblocking after xxx ms" from FLUSH.blockMessageDuringFlush()

[Bela Ban (JIRA)]

     [ https://jira.jboss.org/browse/JGRP-1239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban updated JGRP-1239:
---------------------------

         Assignee: Vladimir Blagojevic  (was: Bela Ban)
    Fix Version/s: 2.10.1
                   2.11


> Spurious warning "unblocking after xxx ms" from FLUSH.blockMessageDuringFlush()
> -------------------------------------------------------------------------------
>
>                 Key: JGRP-1239
>                 URL: https://jira.jboss.org/browse/JGRP-1239
>             Project: JGroups
>          Issue Type: Bug
>    Affects Versions: 2.10
>         Environment: All
>            Reporter: Eric Sirianni
>            Assignee: Vladimir Blagojevic
>            Priority: Minor
>             Fix For: 2.10.1, 2.11
>
>
> JavaDoc from java.util.concurrent.locks.Condition.await(...) indicates that FALSE is returned if a timeout occurred.  
> {code}
>     /**
>      * ...
>      * @return {@code false} if the waiting time detectably elapsed
>      *         before return from the method, else {@code true}
>      */
>     boolean await(long time, TimeUnit unit) throws InterruptedException;
> {code}
> However, the JGroups code below is acting as if TRUE is returned if a timeout occurred.
> {code}
>     private void blockMessageDuringFlush() {
>         boolean shouldSuspendByItself = false;
>         blockMutex.lock();
>         try {
>             while (isBlockingFlushDown) {
>                 if (log.isDebugEnabled())
>                     log.debug(localAddress + ": blocking for " + (timeout <= 0 ? "ever" : timeout + "ms"));
>                     shouldSuspendByItself = notBlockedDown.await(timeout, TimeUnit.MILLISECONDS);
>             }
>             if (shouldSuspendByItself) {
>                 isBlockingFlushDown = false;      
>                 log.warn(localAddress + ": unblocking after " + timeout + "ms");
>                 flush_promise.setResult(Boolean.TRUE);
>                 notBlockedDown.signalAll();
>             }            
>         } catch (InterruptedException e) {
>            Thread.currentThread().interrupt();
>         } finally {
>             blockMutex.unlock();
>         }        
>     }
> {code}
> This causes spurious WARNING level messages to be logged by JGroups when in fact no timeout occurred.
> The fix is simple:
> {noformat}
> < shouldSuspendByItself = notBlockedDown.await(timeout, TimeUnit.MILLISECONDS);
> --
> > shouldSuspendByItself = !notBlockedDown.await(timeout, TimeUnit.MILLISECONDS);
> {noformat}

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