Description of problem: During the execution of a MapReduce word count job with 6 nodes, the following NPE is thrown: 11:19:37,870 ERROR [org.infinispan.remoting.InboundInvocationHandlerImpl] (remote-thread-2) Exception executing command java.lang.NullPointerException at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.reduce(MapReduceManagerImpl.java:153) at org.infinispan.commands.read.ReduceCommand.perform(ReduceCommand.java:88) at org.infinispan.remoting.InboundInvocationHandlerImpl.handleInternal(InboundInvocationHandlerImpl.java:122) at org.infinispan.remoting.InboundInvocationHandlerImpl.access$000(InboundInvocationHandlerImpl.java:68) at org.infinispan.remoting.InboundInvocationHandlerImpl$2.run(InboundInvocationHandlerImpl.java:194) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:724) The full log is here - https://jenkins.mw.lab.eng.bos.redhat.com/hudson/user/afield@REDHAT.COM/my-views/view/afield's%20jobs/job/jdg-radargun-mapreduce-test/181/console-edg-perf06/ Looking at the code to see if I can figure out what happened.
Dan Berindei <dberinde> made a comment on jira ISPN-3321 [~afield] The stack traces are a outdated, could we get another run with the latest master?
Alan Field <afield> made a comment on jira ISPN-3321 [~dan.berindei] I'll try, but this one isn't 100% reproducible
Alan Field <afield> made a comment on jira ISPN-3321 [~dan.berindei] These tests were run with Infinispan 5.3.0 Final, if that helps any. Still trying to see if I can reproduce it.
Dan Berindei <dberinde> made a comment on jira ISPN-3321 [~afield] I think the problem here is that the default intermediary cache configuration has a {{lifespan}} and {{maxIdle}} of 120 seconds. The error appeared almost 3 minutes after the map/reduce task started, so it's very likely that the entry inserted by the mapper in the intermediary cache expired just as the reducer was trying to read it. I don't think there is any reason to have expiry in the intermediary cache, so I'll change the default configuration in CreateCacheCommand. If a cache {{\_\_tmpMapReduce}} is defined, its configuration will be used instead of the default configuration in CreateCacheCommand. So defining a cache {{\_\_tmpMapReduce}} without any special settings is a good workaround in the meantime.
Adrian Nistor <anistor> made a comment on jira ISPN-3321 Integrated in master. Thanks!
I'll try to verify this
I have not been able to reproduce this NPE anymore. If I see this again, I will reopen this bug.
This product has been discontinued or is no longer tracked in Red Hat Bugzilla.