Low Description
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.
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)
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.