Russ Hatch created CASSANDRA-12026:
--------------------------------------

             Summary: update NEWS.txt to explain system schema exceptions 
during partial cluster upgrade
                 Key: CASSANDRA-12026
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12026
             Project: Cassandra
          Issue Type: Bug
            Reporter: Russ Hatch


Upgrade tests found this exception occuring during upgrades:
{noformat}
node2: ERROR [MessagingService-Incoming-/127.0.0.1] 2016-06-16 20:14:59,268 
CassandraDaemon.java:217 - Exception in thread 
Thread[MessagingService-Incoming-/127.0.0.1,5,main]
java.lang.RuntimeException: Unknown column cdc during deserialization
        at 
org.apache.cassandra.db.Columns$Serializer.deserialize(Columns.java:433) 
~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.SerializationHeader$Serializer.deserializeForMessaging(SerializationHeader.java:407)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.rows.UnfilteredRowIteratorSerializer.deserializeHeader(UnfilteredRowIteratorSerializer.java:192)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.partitions.PartitionUpdate$PartitionUpdateSerializer.deserialize30(PartitionUpdate.java:668)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.partitions.PartitionUpdate$PartitionUpdateSerializer.deserialize(PartitionUpdate.java:656)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.Mutation$MutationSerializer.deserialize(Mutation.java:341)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.db.Mutation$MutationSerializer.deserialize(Mutation.java:350)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.service.MigrationManager$MigrationsSerializer.deserialize(MigrationManager.java:610)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.service.MigrationManager$MigrationsSerializer.deserialize(MigrationManager.java:593)
 ~[apache-cassandra-3.7.jar:3.7]
        at org.apache.cassandra.net.MessageIn.read(MessageIn.java:114) 
~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.net.IncomingTcpConnection.receiveMessage(IncomingTcpConnection.java:190)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.net.IncomingTcpConnection.receiveMessages(IncomingTcpConnection.java:178)
 ~[apache-cassandra-3.7.jar:3.7]
        at 
org.apache.cassandra.net.IncomingTcpConnection.run(IncomingTcpConnection.java:92)
 ~[apache-cassandra-3.7.jar:3.7]
{noformat}

Which is apparently normal and should subside after full cluster upgrade to 
post-3.0 versions.

NEWS.txt needs an update to let users know this is not a problem during their 
upgrade.



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