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https://issues.apache.org/jira/browse/CASSANDRA-6714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13903258#comment-13903258
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Piotr Kołaczkowski commented on CASSANDRA-6714:
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Discovered while testing CASSANDRA-6707.
> Upgrading from 1.2 to 2.0 without prior nodetool flush causes data loss
> -----------------------------------------------------------------------
>
> Key: CASSANDRA-6714
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6714
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Old node: Cassandra 1.2.15 (DSE)
> New node: Cassandra 2.0.5.1 (DSE)
> Reporter: Piotr Kołaczkowski
> Assignee: Aleksey Yeschenko
> Priority: Critical
>
> Accidentally forgetting to nodetool drain or flush before upgrading to 2.0
> causes silent loss of unflushed data. No errors or warnings are reported in
> the system.log.
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