[CASSANDRA-12026] update NEWS.txt to explain system schema exceptions during partial cluster upgrade

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 3.8
• Severity: Normal
• Assignee: Joshua McKenzie Assign to me
• Reporter: Russ Hatch

Authors

Joshua McKenzie

Reviewers

Carl Yeksigian

• Created: 17/Jun/16 18:28
• Updated: 16/Apr/19 09:30
• Resolved: 22/Jun/16 17:26

Description

Upgrade tests found this exception occuring during upgrades:

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]

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.