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https://issues.apache.org/jira/browse/CASSANDRA-1111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12873600#action_12873600
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Dominic Williams commented on CASSANDRA-1111:
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Hi, fwiw was planning to use describe_ring() in new Pelops Java client library
to discover the nodes in a cluster i.e. connection pool starts with a few known
nodes then discovers all.
Problem occurred on single node setup on my laptop but I'm guessing that
without this working there would be no way to "know" there is only one node.
In such cases TokenRange will always map to 1/the same node, but that's still
useful information, at least for Pelops
> describe_ring() throws on single node clusters and/or probably clusters
> without a replication factor
> ----------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-1111
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1111
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.6
> Environment: Mac OS X Snow Leopard
> Reporter: Dominic Williams
> Assignee: Gary Dusbabek
> Fix For: 0.6.3, 0.7
>
> Attachments: 1111-0.6.txt
>
> Original Estimate: 0.75h
> Remaining Estimate: 0.75h
>
> You use Thrift to call describe_ring() on a cluster with only a single node.
> The Thrift connection is broken, and the system.log shows the exception that
> has been thrown:
> ERROR [pool-1-thread-15] 2010-05-20 13:15:24,753 TThreadPoolServer.java (line
> 259) Error occurred during processing of message.
> java.lang.RuntimeException: No replica strategy configured for L1AbuseReports
> at
> org.apache.cassandra.service.StorageService.getReplicationStrategy(StorageService.java:246)
> at
> org.apache.cassandra.service.StorageService.constructRangeToEndPointMap(StorageService.java:457)
> at
> org.apache.cassandra.service.StorageService.getRangeToAddressMap(StorageService.java:443)
> at
> org.apache.cassandra.service.StorageService.getRangeToEndPointMap(StorageService.java:433)
> at
> org.apache.cassandra.thrift.CassandraServer.describe_ring(CassandraServer.java:628)
> at
> org.apache.cassandra.thrift.Cassandra$Processor$describe_ring.process(Cassandra.java:1781)
> at
> org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:1125)
> at
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:253)
> 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:637)
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