org.jgroups.TimeoutException after invoking MapCombineCommand in Map/Reduce task with 2 nodes --------------------------------------------------------------------------------------------- Key: ISPN-2836 URL: https://issues.jboss.org/browse/ISPN-2836 Project: Infinispan Issue Type: Bug Components: Distributed Execution and Map/Reduce Affects Versions: 5.2.1.Final Reporter: Alan Field Assignee: Pedro Ruivo Priority: Blocker Labels: onboard Fix For: 5.3.0.Final Attachments: afield-tcp-521-final.txt, benchmark-mapreduce-multifilesize.xml, dist-udp-no-tx.xml, jgroups-udp.xml, udp-edg-perf01.txt, udp-edg-perf02.txt Using RadarGun and two nodes to execute the example WordCount Map/Reduce job against a cache with ~550 keys with a value size of 1MB is producing a thread deadlock. The cache is distributed with transactions disabled. TCP transport deadlocks without throwing an exception. Disabling the send queue and setting UNICAST2.conn_expiry_timeout=0 prevents the deadlock, but the job does not complete. The nodes send "are-you-alive" messages back and forth, and I have seen the following exception: {noformat} 11:44:29,970 ERROR [org.jgroups.protocols.TCP] (OOB-98,default,edg-perf01-1907) failed sending message to edg-perf02-32536 (76 bytes): java.net.SocketException: Socket closed, cause: null at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:352) at org.radargun.cachewrappers.InfinispanMapReduceWrapper.executeMapReduceTask(InfinispanMapReduceWrapper.java:98) at org.radargun.stages.MapReduceStage.executeOnSlave(MapReduceStage.java:74) at org.radargun.Slave$2.run(Slave.java:103) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Caused by: java.util.concurrent.ExecutionException: org.infinispan.CacheException: org.jgroups.TimeoutException: timeout sending message to edg-perf02-32536 at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222) at java.util.concurrent.FutureTask.get(FutureTask.java:83) at org.infinispan.distexec.mapreduce.MapReduceTask$TaskPart.get(MapReduceTask.java:832) at org.infinispan.distexec.mapreduce.MapReduceTask.executeMapPhaseWithLocalReduction(MapReduceTask.java:477) at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:350) ... 9 more Caused by: org.infinispan.CacheException: org.jgroups.TimeoutException: timeout sending message to edg-perf02-32536 at org.infinispan.util.Util.rewrapAsCacheException(Util.java:541) at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.invokeRemoteCommand(CommandAwareRpcDispatcher.java:186) at org.infinispan.remoting.transport.jgroups.JGroupsTransport.invokeRemotely(JGroupsTransport.java:515) 11:44:29,978 ERROR [org.jgroups.protocols.TCP] (Timer-3,default,edg-perf01-1907) failed sending message to edg-perf02-32536 (60 bytes): java.net.SocketException: Socket closed, cause: null at org.infinispan.remoting.rpc.RpcManagerImpl.invokeRemotely(RpcManagerImpl.java:175) at org.infinispan.remoting.rpc.RpcManagerImpl.invokeRemotely(RpcManagerImpl.java:197) at org.infinispan.remoting.rpc.RpcManagerImpl.invokeRemotely(RpcManagerImpl.java:254) at org.infinispan.remoting.rpc.RpcManagerImpl.access$000(RpcManagerImpl.java:80) at org.infinispan.remoting.rpc.RpcManagerImpl$1.call(RpcManagerImpl.java:288) ... 5 more Caused by: org.jgroups.TimeoutException: timeout sending message to edg-perf02-32536 at org.jgroups.blocks.MessageDispatcher.sendMessage(MessageDispatcher.java:390) at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.processSingleCall(CommandAwareRpcDispatcher.java:301) 11:44:29,979 ERROR [org.jgroups.protocols.TCP] (Timer-4,default,edg-perf01-1907) failed sending message to edg-perf02-32536 (63 bytes): java.net.SocketException: Socket closed, cause: null at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.invokeRemoteCommand(CommandAwareRpcDispatcher.java:179) ... 11 more {noformat} With UDP transport, both threads are deadlocked. I will attach thread dumps from runs using TCP and UDP transport.