[infinispan-issues] [JBoss JIRA] (ISPN-8933) NullPointerException in StreamResponseCommand

[William Burns (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-8933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544812#comment-13544812 ] 

William Burns commented on ISPN-8933:
-------------------------------------

Also we can't return the actual value as this would mess up operations that retry the operation until a stable topology occurs such as collect, toArray, count etc. This is due to the fact that data container clears the cache and it could read part of the data causing an inconsistent value. Thus we always throw away results when the cache is shutting down. We could technically preserve results for operations that don't wait for a stable topology, but that seems like it would just complicate code more.

> NullPointerException in StreamResponseCommand
> ---------------------------------------------
>
>                 Key: ISPN-8933
>                 URL: https://issues.jboss.org/browse/ISPN-8933
>             Project: Infinispan
>          Issue Type: Bug
>            Reporter: Pedro Ruivo
>            Assignee: William Burns
>             Fix For: 9.2.1.Final, 9.3.0.Alpha1
>
>
> {{Cache.isEmpty()}} can fail with timeout with concurrent rebalance.
> {code:java}
> 2018-03-12 11:48:45,699 ERROR (testng-RemoveCounterTest) [org.infinispan.commons.test.TestSuiteProgress] Test failed: org.infinispan.counter.RemoveCounterTest.testCounterManagerNonExistingRemoveWithBounded
> org.infinispan.util.concurrent.TimeoutException: null
>         at org.infinispan.stream.impl.AbstractCacheStream.performOperationRehashAware(AbstractCacheStream.java:298) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.stream.impl.AbstractCacheStream.performOperation(AbstractCacheStream.java:218) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.stream.impl.DistributedCacheStream.anyMatch(DistributedCacheStream.java:414) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.cache.impl.CacheImpl.isEmpty(CacheImpl.java:438) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.cache.impl.CacheImpl.isEmpty(CacheImpl.java:434) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
> {code}
> There is a {{NullPointerException}} in {{StreamResponseCommand}} that may be related.
> {code:java}
> 2018-03-12 11:48:30,698 WARN  (remote-thread-RemoveCounterTest-NodeA-p10-t4) [org.infinispan.remoting.inboundhandler.TrianglePerCacheInboundInvocationHandler] ISPN000071: Caught exception when handling command StreamResponseCommand{id=RemoveCounterTest-NodeA-6448335, complete=true, response=null}
> java.lang.NullPointerException: null
>         at org.infinispan.stream.impl.DistributedCacheStream.lambda$anyMatch$4(DistributedCacheStream.java:414) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.stream.impl.ClusterStreamManagerImpl$RequestTracker.lastResult(ClusterStreamManagerImpl.java:707) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.stream.impl.ClusterStreamManagerImpl.receiveResponse(ClusterStreamManagerImpl.java:410) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.stream.impl.StreamSegmentResponseCommand.invokeAsync(StreamSegmentResponseCommand.java:39) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.remoting.inboundhandler.BasePerCacheInboundInvocationHandler.invokeCommand(BasePerCacheInboundInvocationHandler.java:94) ~[infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.invoke(BaseBlockingRunnable.java:99) [infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.runAsync(BaseBlockingRunnable.java:71) [infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at org.infinispan.remoting.inboundhandler.BaseBlockingRunnable.run(BaseBlockingRunnable.java:40) [infinispan-core-9.2.1-SNAPSHOT.jar:9.2.1-SNAPSHOT]
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_152]
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_152]
>         at java.lang.Thread.run(Thread.java:748) [?:1.8.0_152]
> {code}
> Causes failures in 
> {noformat}
> RemoveCounterTest.testCounterManagerNonExistingRemoveWithBounded()
> {noformat}



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