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https://issues.apache.org/jira/browse/CASSANDRA-16286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17276530#comment-17276530
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Andres de la Peña commented on CASSANDRA-16286:
-----------------------------------------------
Committed to cassandra-2.2 as
[d3e48e4e00b1e8bd45e0694c5a8d9a0e941fa985|https://github.com/apache/cassandra/commit/d3e48e4e00b1e8bd45e0694c5a8d9a0e941fa985]
and merged up to trunk.
> Make TokenMetadata's ring version increments atomic
> ---------------------------------------------------
>
> Key: CASSANDRA-16286
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16286
> Project: Cassandra
> Issue Type: Bug
> Components: Cluster/Gossip
> Reporter: Caleb Rackliffe
> Assignee: Caleb Rackliffe
> Priority: Normal
> Fix For: 2.2.20, 3.0.25, 3.11.11, 4.0-rc
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> The update semantics of the ring version in {{TokenMetadata}} are not clear.
> The instance variable itself is {{volatile}}, but it is still incremented by
> a non-atomic check-and-set, and not all codepaths do that while holding the
> {{TokenMetadata}} write lock. We could make this more intelligible by forcing
> the external callers to use both the write when invalidating the ring and
> read lock when reading the current ring version. Most of the readers of the
> ring version (ex. compaction) don't need it to be fast, but it shouldn't be a
> problem even if they do. If we do this, we should be able to avoid a
> situation where concurrent invalidations don't produce two distinct version
> increments.
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