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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Failed migration from 1.1.6 to 1.2.2
Date Thu, 14 Mar 2013 11:13:25 GMT
Hi

We just tried to migrate our production cluster from C* 1.1.6 to 1.2.2.

This has been a disaster. I just switch one node to 1.2.2, updated its
configuration (cassandra.yaml / cassandra-env.sh) and restart it.

It resulted on error on all the 5 remaining 1.1.6 nodes :

ERROR [RequestResponseStage:2] 2013-03-14 09:53:25,750
AbstractCassandraDaemon.java (line 135) Exception in thread
Thread[RequestResponseStage:2,5,main]
java.io.IOError: java.io.EOFException
        at
org.apache.cassandra.service.AbstractRowResolver.preprocess(AbstractRowResolver.java:71)
        at
org.apache.cassandra.service.ReadCallback.response(ReadCallback.java:155)
        at
org.apache.cassandra.net.ResponseVerbHandler.doVerb(ResponseVerbHandler.java:45)
        at
org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:59)
        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)
Caused by: java.io.EOFException
        at java.io.DataInputStream.readFully(DataInputStream.java:180)
        at
org.apache.cassandra.db.ReadResponseSerializer.deserialize(ReadResponse.java:100)
        at
org.apache.cassandra.db.ReadResponseSerializer.deserialize(ReadResponse.java:81)
        at
org.apache.cassandra.service.AbstractRowResolver.preprocess(AbstractRowResolver.java:64)
        ... 6 more

I had this a lot of times, and my entire cluster wasn't reachable by our 4
clients (phpCassa, Hector, Cassie, Helenus)

I decommissioned the 1.2.2 node to get our cluster answering queries. It
worked.

Then I tried to replace this node by a new C*1.1.6 one with the same token
as the previous node decommissioned. The node joined the ring and before
getting any data switch to normal status.

In all the other nodes I had :

ERROR [MutationStage:8] 2013-03-14 10:21:01,288
AbstractCassandraDaemon.java (line 135) Exception in thread
Thread[MutationStage:8,5,main]
java.lang.AssertionError
        at
org.apache.cassandra.locator.TokenMetadata.getToken(TokenMetadata.java:304)
        at
org.apache.cassandra.service.StorageProxy$5.runMayThrow(StorageProxy.java:371)
        at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
        at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
        at
java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)

So I decommissioned this new 1.1.6 node and we are now running with 5
servers, not balanced along the ring, without any possibility of adding
nodes, nor upgradinc C* version.

We are quite desperate over here.

If someone has any idea of what could happened and how to stabilize the
cluster, it will be very appreciated.

It's quite an emergency since we can't add nodes and are under heavy load.

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