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https://issues.apache.org/jira/browse/CASSANDRA-16588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Sam Tunnicliffe updated CASSANDRA-16588:
----------------------------------------
    Reviewers: Ekaterina Dimitrova, Sam Tunnicliffe, Sam Tunnicliffe  (was: 
Ekaterina Dimitrova, Sam Tunnicliffe)
               Ekaterina Dimitrova, Sam Tunnicliffe, Sam Tunnicliffe  (was: 
Ekaterina Dimitrova)
       Status: Review In Progress  (was: Patch Available)

> NPE getting host_id in Gossiper.isSafeForStartup
> ------------------------------------------------
>
>                 Key: CASSANDRA-16588
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16588
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Cluster/Gossip
>            Reporter: Brandon Williams
>            Assignee: Brandon Williams
>            Priority: Normal
>             Fix For: 3.11.x, 4.0-rc
>
>
> As seen here: 
> https://ci-cassandra.apache.org/job/Cassandra-devbranch/604/testReport/junit/org.apache.cassandra.distributed.upgrade/MixedModeGossipTest/testStatusFieldShouldExistInOldVersionNodesEdgeCase/
> {noformat}
> java.lang.NullPointerException
>       at org.apache.cassandra.gms.Gossiper.isSafeForStartup(Gossiper.java:952)
>       at 
> org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:657)
>       at 
> org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:933)
>       at 
> org.apache.cassandra.service.StorageService.initServer(StorageService.java:784)
>       at 
> org.apache.cassandra.service.StorageService.initServer(StorageService.java:729)
>       at 
> org.apache.cassandra.distributed.impl.Instance.lambda$startup$10(Instance.java:541)
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>       at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>       at 
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
>       at java.lang.Thread.run(Thread.java:748)
> {noformat}
> I believe what is happening is a GossipDigestAck has been queued to ack the 
> shutdown state from the node on the seed, but isn't actually sent until the 
> node has restarted and gone into shadow.  Since the ack contains the node's 
> IP, it assumes a host_id will be there but since this is not an actual shadow 
> response, it is not.



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