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https://issues.apache.org/jira/browse/CASSANDRA-6732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905405#comment-13905405
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Jeremiah Jordan commented on CASSANDRA-6732:
--------------------------------------------
Simple fix of not trying to Cross DC forwarding to old nodes attached. If
someone wants they can do a more complicated fix that uses the old 1.1 headers
for 1.1 nodes.
> Cross DC writes not compatible 1.2->1.1 during rolling upgrade
> --------------------------------------------------------------
>
> Key: CASSANDRA-6732
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6732
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jeremiah Jordan
> Fix For: 1.2.16
>
> Attachments:
> 0001-Don-t-try-to-do-Cross-DC-forwarding-to-old-nodes.patch
>
>
> During a rolling upgrade from 1.1.12 to 1.2.15 one DC at a time only 1/3 of
> the writes to the first DC to be upgraded actually make it to the other DC,
> and LOTS of hints attempt to get made.
> Looks like the header for forwarded writes changed from 1.1->1.2 so the 1.1
> nodes can't read it.
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