[jira] [Commented] (CASSANDRA-6732) Cross DC writes not compatible 1.2->1.1 during rolling upgrade

["Jeremiah Jordan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13905405#comment-13905405 ] 

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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