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https://issues.apache.org/jira/browse/CASSANDRA-6554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864450#comment-13864450
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Michael Shuler commented on CASSANDRA-6554:
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I understand the above, due to schema not being able to propogate, is expected,
until all the nodes are upgraded.
> Cluster is read-only during upgrade of nodes from 1.2 -> 2.0
> ------------------------------------------------------------
>
> Key: CASSANDRA-6554
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6554
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: EC2 Ubuntu Precise 12.04
> Oracle JRE 1.7_25
> C* 1.2.13 upgrade to 2.0.4
> Reporter: Michael Shuler
>
> During an upgrade from 1.2.13 to 2.0.3/2.0.4, the cluster is read-only and
> writes fail, until the entire cluster is fully upgraded.
> (I'm gathering complete repro steps, test results, and logs to try to help
> and will post those asap, as well as try other versions to see what happens)
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