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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3114) After Choosing EC2Snitch you can't migrate off w/o a full cluster restart
Date Fri, 16 Sep 2011 02:04:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105814#comment-13105814
] 

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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