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From Shashilpi Krishan <>
Subject Row Mutation Errors while upgrading to Cassandra2.0
Date Mon, 23 Sep 2013 02:02:21 GMT
Hi Everyone.

We had a Cassandra cluster (running with v1.0.7) spread across 3 data centers with each data
center having 16 nodes. We started upgrading that to 2.0 but realized that we can't go directly
to 2.0 due to read failures, hence to avoid down time we have to go from 1.0 --> 1.1 -->
1.2 --> 2.0.

Now problem is while upgrading from 1.2 --> 2.0 we saw below errors flooding the system.log
files in one data center only until we upgraded all the nodes in every DC to 2.0. We think
that moment last node was upgraded then this error was gone. Does anyone has idea what could
have been causing this? Is it because of some version incompatibility?

ERROR [MutationStage:208] 2013-09-21 17:51:08,163 (line 63) Error
in row mutation
        at org.apache.cassandra.db.RowMutationVerbHandler.forwardToLocalNodes(
        at org.apache.cassandra.db.RowMutationVerbHandler.doVerb(
        at java.util.concurrent.ThreadPoolExecutor.runWorker(
        at java.util.concurrent.ThreadPoolExecutor$
Thanks & Regards

Shashilpi Krishan

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