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https://issues.apache.org/jira/browse/RATIS-1657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Doroszlai updated RATIS-1657:
------------------------------------
    Attachment: org.apache.ratis.grpc.TestLogAppenderWithGrpc-output.txt
                org.apache.ratis.grpc.TestLogAppenderWithGrpc.txt

> Intermittent failure in TestLogAppenderWithGrpc#testPendingLimits due to 
> ConcurrentModificationException at SlidingWindow$Client.trySendDelayed
> -----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: RATIS-1657
>                 URL: https://issues.apache.org/jira/browse/RATIS-1657
>             Project: Ratis
>          Issue Type: Bug
>            Reporter: Attila Doroszlai
>            Priority: Major
>         Attachments: 
> org.apache.ratis.grpc.TestLogAppenderWithGrpc-output.txt, 
> org.apache.ratis.grpc.TestLogAppenderWithGrpc.txt
>
>
> {code:title=https://github.com/apache/ratis/runs/7640279593?check_suite_focus=true#step:5:552}
> Tests run: 10, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 30.222 s <<< 
> FAILURE! - in org.apache.ratis.grpc.TestLogAppenderWithGrpc
> testPendingLimits[0](org.apache.ratis.grpc.TestLogAppenderWithGrpc)  Time 
> elapsed: 6.874 s  <<< ERROR!
> java.util.concurrent.CompletionException: 
> org.apache.ratis.protocol.exceptions.AlreadyClosedException: 
> SlidingWindow$Client:client-920847F5D7C6->RAFT is closed.
> ...
> Caused by: java.util.ConcurrentModificationException
>       at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1211)
>       at java.util.TreeMap$KeyIterator.next(TreeMap.java:1265)
>       at 
> org.apache.ratis.util.SlidingWindow$Client.trySendDelayed(SlidingWindow.java:330)
>       at 
> org.apache.ratis.util.SlidingWindow$Client.receiveReply(SlidingWindow.java:323)
>       at 
> org.apache.ratis.client.impl.OrderedAsync.lambda$sendRequest$9(OrderedAsync.java:248)
> {code}



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