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: Dan Berindei Labels: nbst, 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.