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https://issues.apache.org/jira/browse/CASSANDRA-5815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802224#comment-13802224
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Tyler Hobbs commented on CASSANDRA-5815:
----------------------------------------
+1
> NPE from migration manager
> --------------------------
>
> Key: CASSANDRA-5815
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5815
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.1.12
> Reporter: Vishy Kasar
> Assignee: Brandon Williams
> Priority: Minor
> Fix For: 1.2.12
>
> Attachments: 5185.txt
>
>
> In one of our production clusters we see this error often. Looking through
> the source, Gossiper.instance.getEndpointStateForEndpoint(endpoint) is
> returning null for some end point. De we need any config change on our end to
> resolve this? In any case, cassandra should be updated to protect against
> this NPE.
> {noformat}
> ERROR [OptionalTasks:1] 2013-07-24 13:40:38,972 AbstractCassandraDaemon.java
> (line 132) Exception in thread Thread[OptionalTasks:1,5,main]
> java.lang.NullPointerException
> at
> org.apache.cassandra.service.MigrationManager$1.run(MigrationManager.java:134)
>
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)
>
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:206)
>
> 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)
> {noformat}
> It turned out that the reason for NPE was we bootstrapped a node with the
> same token as another node. Cassandra should not throw an NPE here but log a
> meaningful error message.
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