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https://issues.apache.org/jira/browse/CASSANDRA-6619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Minh Do updated CASSANDRA-6619:
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Attachment: (was: diff)
> Race condition issue during upgrading 1.1 to 1.2
> ------------------------------------------------
>
> Key: CASSANDRA-6619
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6619
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Minh Do
> Assignee: Minh Do
> Priority: Minor
> Fix For: 1.2.14
>
>
> There is a race condition during upgrading a C* 1.1x cluster to C* 1.2.
> One issue is that OutboundTCPConnection can't establish from a 1.2 node to
> some 1.1x nodes. Because of this, a live cluster during the upgrading will
> suffer in high read latency and be unable to fulfill some write requests. It
> won't be a problem if there is a small cluster but it is a problem in a large
> cluster (100+ nodes) because the upgrading process takes 10+ hours to 1+
> day(s) to complete.
> Acknowledging about CASSANDRA-5692, however, it is not fully fixed. We
> already have a patch for this and will attach shortly for feedback.
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