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

[Pedro Ruivo (JIRA)]

Pedro Ruivo created ISPN-2966:
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             Summary: 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
             Fix For: 5.3.0.Final


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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