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https://issues.apache.org/jira/browse/CASSANDRA-4932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625880#comment-13625880
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Yuki Morishita commented on CASSANDRA-4932:
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+1
> Agree on a gcbefore/expirebefore value for all replica during validation
> compaction
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-4932
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4932
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Sylvain Lebresne
> Assignee: Marcus Eriksson
> Priority: Minor
> Fix For: 2.0
>
> Attachments: 0001-CASSANDRA-4932.patch, 0001-CASSANDRA-4932-v2.patch
>
>
> CASSANDRA-4905 made it so that we don't include gcable tombstones in merkle
> tree digests because otherwise the fact that a gcable tombstone exists in a
> given node depends on the local scheduling of compactions, which make the
> merkle-tree digets depends on that which is bad.
> However, we still depends on a value of gcbefore/expirebefore that is
> computed locally on the node. This is not a huge deal because each node
> should compute those value roughly at the same time so the discrepancies
> shouldn't exceed a few hundreds of milliseconds in general and a few seconds
> if we're unlucky. Still, it's fairly easy to fix this problem by having the
> repair coordinator pick the gcbefore/expirebefore and share that with all the
> replica. It does require sending that info on the wire though, so will
> require a new messaging version and thus can only be done in a major cycle.
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