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https://issues.apache.org/jira/browse/CASSANDRA-3023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085353#comment-13085353
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Brandon Williams commented on CASSANDRA-3023:
---------------------------------------------
Was the cluster still mixed between 0.8.3 and 0.8.4 at that point? That would
do it. The easiest thing to do is not describe the ring until all machines are
on the same version.
> NPE in describe_ring
> --------------------
>
> Key: CASSANDRA-3023
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3023
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.8.4
> Reporter: Eric Falcao
> Assignee: Brandon Williams
>
> Not sure how much of the following is relevant besides the stack trace, but
> here I go:
> I have a 2 DC, 2 node per DC cluster. DC1 had it's seed replaced but I hadn't
> restarted. I upgraded to 0.8.4 in the following fashion:
> -edited seeds
> -stopped both DC1 nodes
> -upgraded jars
> -started both nodes at the same time
> The non-seed node came up first and showed the following error. Then when the
> seed node came up, the error went away on the non-seed node but started
> occurring on the seed node:
> ERROR [pool-2-thread-15] 2011-08-12 22:32:27,438 Cassandra.java (line 3668)
> Internal error processing describe_ring
> java.lang.NullPointerException
> at
> org.apache.cassandra.service.StorageService.getRangeToRpcaddressMap(StorageService.java:623)
> at
> org.apache.cassandra.thrift.CassandraServer.describe_ring(CassandraServer.java:731)
> at
> org.apache.cassandra.thrift.Cassandra$Processor$describe_ring.process(Cassandra.java:3664)
> at org.apache.cassandra.thrift.Brisk$Processor.process(Brisk.java:464)
> at
> org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:187)
> 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:619)
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