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https://issues.apache.org/jira/browse/IGNITE-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16344489#comment-16344489
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Tim Onyschak commented on IGNITE-7090:
--------------------------------------
I may be doing something wrong, but when i attempted both solution. Removing
the closure and manually adjusting the SemaphoreState, neither seemed to work.
The execution without the closure in same thread seems to hang/deadlock on
initializeSemaphore() ( specifically cacheView.get(key); )
Then, manually setting SemaphoreState within the
DataStructuresProcessor#semaphore() witha few iterations of the below code did
not seem to work as well. I must be missing something within the onNodeRemoved.
Guessing something around the GridCacheSemaphoreImpl.Sync
{code:java}
if(val!=null){
GridCacheSemaphoreState semState=(GridCacheSemaphoreState)val;
boolean updated=false;
Map<UUID,Integer> waiters = semState.getWaiters();
for(UUID nodeId:waiters.keySet()){
ClusterNode node = ctx.cluster().get().node(nodeId);
if(node==null){
waiters.remove(nodeId);
updated=true;
}
}
if(updated) {
semState.setWaiters(waiters);
sem0.onUpdate(semState);
retVal=semState;
}
}{code}
Any thoughts?
> Semaphore Stuck when no acquirers to assign permit
> --------------------------------------------------
>
> Key: IGNITE-7090
> URL: https://issues.apache.org/jira/browse/IGNITE-7090
> Project: Ignite
> Issue Type: Bug
> Components: cache, data structures
> Affects Versions: 2.1, 2.4
> Reporter: Tim Onyschak
> Priority: Major
> Fix For: 2.5
>
> Attachments: SemaphoreFailoverNoWaitingAcquirerTest.java
>
>
> If no acquirers are available to take permit of semaphore, the permit never
> gets release and any further acquirerers will wait forever.
> On node shut down DataStructuresProcessor.dsMap gets cleared out prior to
> event listener being able to execute onNodeRemoved, hence owner is never
> cleared out if it was unable to pass to a different acquirer.
>
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