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Sylvain Lebresne commented on CASSANDRA-6953:
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lgtm, +1.
> Optimise CounterCell#reconcile
> ------------------------------
>
> Key: CASSANDRA-6953
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6953
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Aleksey Yeschenko
> Assignee: Aleksey Yeschenko
> Priority: Minor
> Fix For: 2.1 beta2
>
>
> Can't have CASSANDRA-6506 in 2.1, but we can get *some* of the benefit by
> optimising CounterCell#reconcile() as it is.
> Specifically, if one context is a superset of the other one, there is no need
> to allocate a BB for the resulting context and merge them - we can just
> return the superset context. With 2.1 producing global shards exclusively,
> this would minimize allocations by a lot for reads from multiple sstables.
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