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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 Wed, 31 Aug 2011 21:16:10 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094904#comment-13094904
] 

Brandon Williams commented on CASSANDRA-3114:
---------------------------------------------

I'm not sure there's a good solution here.  We could make PFEPS inject the local nodes dc/rack
info into gossip similar to what I suggested in CASSANDRA-1974, but you'd still have to name
things with the ec2snitch conventions for things to not break, and it would be very PFEPS-specific;
other snitches are out of the question.

Ultimately I'm inclined to say you need to choose your snitch like you choose your partitioner:
very carefully.

> 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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