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https://issues.apache.org/jira/browse/CASSANDRA-9949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649931#comment-14649931
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Jonathan Ellis commented on CASSANDRA-9949:
-------------------------------------------

Nit: should probably reverse the order of the predicates in {{timestamp < 
getMaxPurgeableTimestamp() && localDeletionTime < gcBefore}} since the former 
is expensive while the latter is not.

> maxPurgeableTimestamp needs to check memtables too
> --------------------------------------------------
>
>                 Key: CASSANDRA-9949
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9949
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>             Fix For: 2.1.x, 2.2.x
>
>
> overlapIterator/maxPurgeableTimestamp don't include the memtables, so a 
> very-out-of-order write could be ignored



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