[infinispan-issues] [JBoss JIRA] (ISPN-2966) NBST: Concurrent leavers can lead to deadlock

[Mircea Markus (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763428#comment-12763428 ] 

Mircea Markus commented on ISPN-2966:
-------------------------------------

as per [~pruivo] this doesn't cause any inconsistencies, just delays the rebalance. 
                
> NBST: Concurrent leavers can lead to deadlock
> ---------------------------------------------
>
>                 Key: ISPN-2966
>                 URL: https://issues.jboss.org/browse/ISPN-2966
>             Project: Infinispan
>          Issue Type: Bug
>            Reporter: Pedro Ruivo
>            Assignee: Pedro Ruivo
>              Labels: state_transfer
>             Fix For: 5.3.0.Final
>
>         Attachments: thread-dump.txt, trace.log
>
>
> This sequence of events, leads to a thread deadlock in the coordinator
> {code}
> 1) NodeF sends LEAVE message. new topologyId=8
> 2) NodeE delivers REBALANCE_START(8)
> 3) NodeF and NodeG delivers REBALANCE_START(8)
> 4) NodeH delivers GET_TRANSACTION(8) from NodeE ==> Transactions were requested by node ConcurrentNonOverlappingLeaveTest-NodeE-28744 with topology 8, greater than the local topology (7). Waiting for topology 8 to be installed locally.
> 5) NodeH sends LEAVE message. new topologyId=9
> 6) NodeH delivers REBALANCE_START(8) ==> Ignoring rebalance 8 for cache dist that doesn't exist locally
> 7) NodeH delivers GET_TRANSACTION(8) from NodeG ==> Transactions were requested by node ConcurrentNonOverlappingLeaveTest-NodeG-31669 with topology 8, greater than the local topology (7). Waiting for topology 8 to be installed locally.
> {code}
> Possible solutions are:
>  - send the REBALANCE_START/CH_UPDATE async
>  - throw an exception when a GET_TRANSACTION is received and the node is shutting down.

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