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https://issues.apache.org/jira/browse/CASSANDRA-16418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17762442#comment-17762442
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Brandon Williams commented on CASSANDRA-16418:
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Let's use a new ticket so the lineage can be tracked more clearly.
> Unsafe to run nodetool cleanup during bootstrap or decommission
> ---------------------------------------------------------------
>
> Key: CASSANDRA-16418
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16418
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Bootstrap and Decommission
> Reporter: James Baker
> Assignee: Lindsey Zurovchak
> Priority: Normal
> Fix For: 4.0.8, 4.1.1, 5.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> What we expected: Running a cleanup is a safe operation; the result of
> running a query after a cleanup should be the same as the result of running a
> query before a cleanup.
> What actually happened: We ran a cleanup during a decommission. All the
> streamed data was silently deleted, the bootstrap did not fail, the cluster's
> data after the decommission was very different to the state before.
> Why: Cleanups do not take into account pending ranges and so the cleanup
> thought that all the data that had just been streamed was redundant and so
> deleted it. We think that this is symmetric with bootstraps, though have not
> verified.
> Not sure if this is technically a bug but it was very surprising (and
> seemingly undocumented) behaviour.
>
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