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https://issues.apache.org/jira/browse/CASSANDRA-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105814#comment-13105814
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Brandon Williams commented on CASSANDRA-3114:
---------------------------------------------
bq. Defaulting the AbstractEndpointSnitch's gossiperStarting by populating the
ApplicationState.DC,ApplicationState.RACK wll help then any snitch relying the
gossip info to getDC and getRack.
Yes, but setting DC to 'foo' and rack to 'bar' just creates a new DC and rack
and breaks the replication policy and consistency guarantees.
> After Choosing EC2Snitch you can't migrate off w/o a full cluster restart
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-3114
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3114
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.7.8, 0.8.4
> Reporter: Benjamin Coverston
>
> Once you choose the Ec2Snitch the gossip messages will trigger this exception
> if you try to move (for example) to the property file snitch:
> ERROR [pool-2-thread-11] 2011-08-30 16:38:06,935 Cassandra.java (line 3041)
> Internal error processing get_slice
> java.lang.NullPointerException
> at org.apache.cassandra.locator.Ec2Snitch.getDatacenter(Ec2Snitch.java:84)
> at
> org.apache.cassandra.locator.DynamicEndpointSnitch.getDatacenter(DynamicEndpointSnitch.java:122)
>
> at
> org.apache.cassandra.service.DatacenterReadCallback.assureSufficientLiveNodes(DatacenterReadCallback.java:77)
>
> at org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:516)
> at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:480)
> at
> org.apache.cassandra.thrift.CassandraServer.readColumnFamily(CassandraServer.java:109)
>
> at
> org.apache.cassandra.thrift.CassandraServer.getSlice(CassandraServer.java:263)
>
> at
> org.apache.cassandra.thrift.CassandraServer.multigetSliceInternal(CassandraServer.java:345)
>
> at
> org.apache.cassandra.thrift.CassandraServer.get_slice(CassandraServer.java:306)
>
> at
> org.apache.cassandra.thrift.Cassandra$Processor$get_slice.process(Cassandra.java:3033)
>
> at
> org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2889)
> at
> org.apache.cassandra.thrift.CustomTThreadPoolServer$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:662)
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