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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5211) Migrating Clusters with gossip tables that have old dead nodes causes NPE, inability to join cluster
Date Tue, 12 Feb 2013 22:19:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13577101#comment-13577101
] 

Jonathan Ellis commented on CASSANDRA-5211:
-------------------------------------------

+1
                
> Migrating Clusters with gossip tables that have old dead nodes causes NPE, inability
to join cluster
> ----------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5211
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5211
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.2.1
>            Reporter: Rick Branson
>            Assignee: Brandon Williams
>             Fix For: 1.2.2
>
>         Attachments: 5211.txt
>
>
> I had done a removetoken on this cluster when it was 1.1.x, and it had a "ghost" entry
for the removed node still in the stored ring data. When the nodes loaded the table up after
conversion to 1.2 and attempting to migrate to VNodes, I got the following traceback:
> ERROR [WRITE-/10.0.0.0] 2013-01-31 18:35:44,788 CassandraDaemon.java (line 133) Exception
in thread Thread[WRITE-/10.0.0.0,5,main]
> java.lang.NullPointerException
> 	at org.apache.cassandra.utils.ByteBufferUtil.string(ByteBufferUtil.java:167)
> 	at org.apache.cassandra.utils.ByteBufferUtil.string(ByteBufferUtil.java:124)
> 	at org.apache.cassandra.cql.jdbc.JdbcUTF8.getString(JdbcUTF8.java:73)
> 	at org.apache.cassandra.cql.jdbc.JdbcUTF8.compose(JdbcUTF8.java:93)
> 	at org.apache.cassandra.db.marshal.UTF8Type.compose(UTF8Type.java:32)
> 	at org.apache.cassandra.cql3.UntypedResultSet$Row.getString(UntypedResultSet.java:96)
> 	at org.apache.cassandra.db.SystemTable.loadDcRackInfo(SystemTable.java:402)
> 	at org.apache.cassandra.locator.Ec2Snitch.getDatacenter(Ec2Snitch.java:117)
> 	at org.apache.cassandra.locator.DynamicEndpointSnitch.getDatacenter(DynamicEndpointSnitch.java:127)
> 	at org.apache.cassandra.net.OutboundTcpConnection.isLocalDC(OutboundTcpConnection.java:74)
> 	at org.apache.cassandra.net.OutboundTcpConnection.connect(OutboundTcpConnection.java:270)
> 	at org.apache.cassandra.net.OutboundTcpConnection.run(OutboundTcpConnection.java:142)
> This is because these ghost nodes had a NULL tokens list in the system/peers table. A
workaround was to delete the offending row in the system/peers table and restart the node.

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