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https://issues.apache.org/jira/browse/CASSANDRA-16422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17282779#comment-17282779
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Brandon Williams commented on CASSANDRA-16422:
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+1 from me if CI is still happy.
> Unable to ALTER KEYSPACE while decommissioned/assassinated nodes are in gossip
> ------------------------------------------------------------------------------
>
> Key: CASSANDRA-16422
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16422
> Project: Cassandra
> Issue Type: Improvement
> Components: Consistency/Bootstrap and Decommission
> Reporter: Jon Meredith
> Assignee: Jon Meredith
> Priority: Normal
> Fix For: 4.0-beta
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> As part of Transient Replication added in CASSANDRA-14404, {{ALTER KEYSPACE}}
> had a validation check added to verify no range movement was taking place.
> The check requires all nodes to be in {{NORMAL}} state. When a node is
> decommissioned or assassinated then it will remain in gossip for 3 days in
> {{LEFT}} state (by default), preventing any keyspace alteration until it has
> expired from gossip, even though it is safe to make the change.
> The validation condition should be changed to all nodes being in {{NORMAL}}
> or {{LEFT}} state instead.
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