[jboss-jira] [JBoss JIRA] Created: (JGRP-1103) NakReceiverWindow: concurrent insertion may insert the same seqno multiple times

[Bela Ban (JIRA)]

NakReceiverWindow: concurrent insertion may insert the same seqno multiple times
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                 Key: JGRP-1103
                 URL: https://jira.jboss.org/jira/browse/JGRP-1103
             Project: JGroups
          Issue Type: Bug
            Reporter: Bela Ban
            Assignee: Bela Ban
            Priority: Blocker
             Fix For: 2.8


When concurrently inserting the same range of seqnos (e.g. 1-100) into the NakReceiverWindow by N threads (e.g. 10), we sometimes end up with duplicate messages for the *same* seqno ! This happens very rarely and only when many threads insert the same message !

This can be observed in DuplicateTest (testOOBMulticastsToAll3Senders()): sometimes the final list contains more than 10 elements.

I reproduced this by testing NakReceiverWindow in isolation, the test is NakReceiverWindowTest2.

I assume this is a regression introduced in 2.8 by moving insertions to and removal from xmit_table out of the write_lock scope in method NakReceiverWindow.add().

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