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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5511) Clean up backwards compatibility complexity for 2.0
Date Wed, 24 Apr 2013 06:09:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640141#comment-13640141
] 

Marcus Eriksson commented on CASSANDRA-5511:
--------------------------------------------

iirc i created a throwaway unit test that does a few RMs with a breakpoint to stop SchemaLoader
from removing the sstable, then copied it into the legacy dir

want me to do it again for ic?
                
> Clean up backwards compatibility complexity for 2.0
> ---------------------------------------------------
>
>                 Key: CASSANDRA-5511
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5511
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 2.0
>
>
> We've supported rolling upgrades (network-compatible for read/write operations) for several
releases, but both 1.0 -> 1.1 and 1.1 -> 1.2 required being on a recent release of the
immediately prior major series for this to work as desired.
> Meanwhile, we still support reading sstables at least back to 0.6 and possibly even earlier.
 This makes dealing with changes to the sstable quite challenging; the recently written-and-reverted
CASSANDRA-5487 comes to mind.
> 2.0 is a good place to drop support for sstables older than 1.2.5.  Our experience with
network compatibility demonstrates that this is not an unreasonable burden to impose, and
the major version number change suggests that this is a logical time to make such a change.

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