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https://issues.apache.org/jira/browse/CASSANDRA-3023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090140#comment-13090140
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Wojciech Meler commented on CASSANDRA-3023:
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Describe_ring is needed even if topology isn't changing. Smart clients need to
describe ring all the time - especially at startup to know which nodes they
should contact. I have such implementation in C based client app.
Also Hadoop is describing ring prior to job execution in
org.apache.cassandra.hadoop.ColumnFamilyInputFormat.
Will problem disappear after full upgrade to 0.8.4? Now I have work-around -
call describe_ring only on my old 0.8.1 nodes, but after full upgrade if it
won't work I will have a big problem...
> 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
> Fix For: 0.8.5
>
>
> 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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