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https://issues.apache.org/jira/browse/CASSANDRA-6505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865863#comment-13865863
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Benedict commented on CASSANDRA-6505:
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bq. I'd rather be on the safe side and save the allocations
I wouldn't worry about this particular duplicate() call. It will absolutely be
stack allocated, so won't affect the heap at all. ByteBufferUtil.arrayCopy
devolves to a for loop of put/get if either is a DirectByteBuffer (though this
could be optimised) so it might also result in suboptimal future behaviour, in
a place we won't necessarily look to change.
> counters++ global shards 2.0 back port
> --------------------------------------
>
> Key: CASSANDRA-6505
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6505
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Aleksey Yeschenko
> Assignee: Aleksey Yeschenko
> Fix For: 2.0.5
>
>
> CASSANDRA-6504 introduces a new type of shard - 'global' - to 2.1. To enable
> live upgrade from 2.0 to 2.1, it's necessary that 2.0 nodes are able to
> understand the new 'global' shards in the counter contexts.
> 2.0 nodes will not produce 'global' shards, but must contain the merge logic.
> It isn't a trivial code change ("non-trivial code in a non-trivial part of
> the code"), hence this separate JIRA issue.
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