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https://issues.apache.org/jira/browse/IGNITE-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16411418#comment-16411418
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Dmitriy Pavlov commented on IGNITE-7090:
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Hi [~Timay], thank you.

This run loolks better than previous , but there are several failures in D
{noformat}
Ignite Data Structures [ tests 4 ]  
     IgniteCacheDataStructuresSelfTestSuite: 
GridCachePartitionedDataStructuresFailoverSelfTest.testSemaphoreConstantTopologyChangeNonFailoverSafe
 (fail rate 3,0%) 
     IgniteCacheDataStructuresSelfTestSuite: 
GridCacheReplicatedDataStructuresFailoverSelfTest.testSemaphoreConstantTopologyChangeNonFailoverSafe
 (fail rate 1,8%) 
     IgniteCacheDataStructuresSelfTestSuite: 
GridCacheReplicatedDataStructuresFailoverSelfTest.testSemaphoreMultipleTopologyChangeNonFailoverSafe
 (fail rate 1,2%) 
    IgniteCacheDataStructuresSelfTestSuite: 
GridCachePartitionedDataStructuresFailoverSelfTest.testSemaphoreMultipleTopologyChangeNonFailoverSafe
 (fail rate 0,6%) 
{noformat}

Is it a separate issue, which is not to be fixed by your patch?


> 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
>            Assignee: 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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