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https://issues.apache.org/jira/browse/SOLR-16425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17619044#comment-17619044
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Mike Drob commented on SOLR-16425:
----------------------------------
[~ichattopadhyaya] , [~noble.paul] - looks like these failures are back
despite the fixes made in SOLR-16344
> NullPointerException in SimplePlacementFactory:
> PlacementRequest.getCollection() is null
> ----------------------------------------------------------------------------------------
>
> Key: SOLR-16425
> URL: https://issues.apache.org/jira/browse/SOLR-16425
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Chris M. Hostetter
> Priority: Major
>
> I noticed that both {{CloudSolrClientTest.testPerReplicaStateCollection}} and
> {{PerReplicaStatesIntegrationTest.testPerReplicaStateCollection}} have
> similar jenkins failure rates – and are written in a similar way – so i went
> looking at the logs to see if i could spot an obviously copy/pasted test bug.
> What i found is that when these tests fail, they (usually) fail with an NPE
> in SimplePlacementFactory – these NPEs occur during some stream processing,
> and thanks to improvements in recent JDKs, some of the jobs from Uwe's
> machines give us the details on what is null..
> {code:java}
> 2> Caused by: java.lang.NullPointerException: Cannot invoke
> "org.apache.solr.cluster.SolrCollection.getName()" because the return value
> of "org.apache.solr.cluster.placement.PlacementRequest.getCollection()" is
> null
> 2> at
> org.apache.solr.cluster.placement.plugins.SimplePlacementFactory$SimplePlacementPlugin.lambda$computePlacements$1(SimplePlacementFactory.java:88)
> ~[solr-core-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT
> 619a30863170f7a80c435082f2193d7297c5393c [snapshot build, details omitted]]
> 2> at
> java.util.Comparator.lambda$comparingInt$7b0bb60$1(Comparator.java:494) ~[?:?]
> 2> at
> java.util.Comparator.lambda$thenComparing$36697e65$1(Comparator.java:220)
> ~[?:?]
> 2> at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355) ~[?:?]
> 2> at java.util.TimSort.sort(TimSort.java:220) ~[?:?]
> 2> at java.util.Arrays.sort(Arrays.java:1307) ~[?:?]
> 2> at
> java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:353) ~[?:?]
> 2> at
> java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:510) ~[?:?]
> 2> at
> java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
> ~[?:?]
> 2> at
> java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
> ~[?:?]
> 2> at
> java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
> 2> at
> java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682) ~[?:?]
> 2> at
> org.apache.solr.cluster.placement.plugins.SimplePlacementFactory$SimplePlacementPlugin.computePlacements(SimplePlacementFactory.java:91)
> ~[solr-core-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT
> 619a30863170f7a80c435082f2193d7297c5393c [snapshot build, details omitted]]
> 2> at
> org.apache.solr.cluster.placement.impl.PlacementPluginAssignStrategy.assign(PlacementPluginAssignStrategy.java:64)
> ~[solr-core-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT
> 619a30863170f7a80c435082f2193d7297c5393c [snapshot build, details omitted]]
> 2> at
> org.apache.solr.cloud.api.collections.Assign$AssignStrategy.assign(Assign.java:431)
> ~[solr-core-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT
> 619a30863170f7a80c435082f2193d7297c5393c [snapshot build, details omitted]]
> 2> at
> org.apache.solr.cloud.api.collections.CreateCollectionCmd.buildReplicaPositions(CreateCollectionCmd.java:552)
> ~[solr-core-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT
> 619a30863170f7a80c435082f2193d7297c5393c [snapshot build, details omitted]]
> 2> at
> org.apache.solr.cloud.api.collections.CreateCollectionCmd.call(CreateCollectionCmd.java:240)
> ~[solr-core-10.0.0-SNAPSHOT.jar:10.0.0-SNAPSHOT
> 619a30863170f7a80c435082f2193d7297c5393c [snapshot b
> {code}
> ...slightly diff example i found...
> {code:java}
> 2> Caused by: java.lang.NullPointerException: Cannot invoke
> "org.apache.solr.cluster.SolrCollection.getName()" because the return value
> of "org.apache.solr.cluster.placement.PlacementRequest.getCollection()" is
> null
> 2> at
> org.apache.solr.cluster.placement.plugins.SimplePlacementFactory$SimplePlacementPlugin.computePlacements(SimplePlacementFactory.java:107)
> ~[main/:?]
> 2> at
> org.apache.solr.cluster.placement.impl.PlacementPluginAssignStrategy.assign(PlacementPluginAssignStrategy.java:74)
> ~[main/:?]
> 2> at
> org.apache.solr.cloud.api.collections.Assign$AssignStrategy.assign(Assign.java:432)
> ~[main/:?]
> 2> at
> org.apache.solr.cloud.api.collections.CreateCollectionCmd.buildReplicaPositions(CreateCollectionCmd.java:552)
> ~[main/:?]
> 2> at
> org.apache.solr.cloud.api.collections.CreateCollectionCmd.call(CreateCollectionCmd.java:240)
> ~[main/:?]
> {code}
> I haven't done an exhaustive search, but these specific errors (NPE rooted in
> {{the return value of
> "org.apache.solr.cluster.placement.PlacementRequest.getCollection()" is
> null}} ) pop up in multiple {{PerReplicaStatesIntegrationTest.test*}}
> methods, as well as at least one occurrence in
> {{CreateCollectionCleanupTest.testAsyncCreateCollectionCleanup}}
> (FYI: I have no idea _why_ {{PlacementRequest.getCollection()}} is sometimes
> null – but I wanted to put this out there in the hopes that people more
> familiar with the code then I am can take a stab at this)
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