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https://issues.apache.org/jira/browse/CASSANDRA-9673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14626150#comment-14626150
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Aleksey Yeschenko commented on CASSANDRA-9673:
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bq. do we also need a BATCH_RESPONSE verb or should we just keep on using
REQUEST_RESPONSE? I've added BATCH_RESPONSE but it is functionally identical to
REQUEST_RESPONSE.
No, we reuse {{REQUEST_RESPONSE}} for almost everything. You do create a new
response message class, but reuse the same verb. Look at the branch for
CASSANDRA-6230 to see how {{HintResponse}} is being handled.
bq. Another question is whether we need to introduce a new stage or is it OK to
keep on using Stage.MUTATION?
We don't *need* to, but it might already have been done by CASSANDRA-6477.
bq. do we already have a ticket or plan for fixing compatibility with older
nodes?
CASSANDRA-9704
> Improve batchlog write path
> ---------------------------
>
> Key: CASSANDRA-9673
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9673
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Aleksey Yeschenko
> Assignee: Stefania
> Fix For: 3.0.0 rc1
>
>
> Currently we allocate an on-heap {{ByteBuffer}} to serialize the batched
> mutations into, before sending it to a distant node, generating unnecessary
> garbage (potentially a lot of it).
> With materialized views using the batchlog, it would be nice to optimise the
> write path:
> - introduce a new verb ({{Batch}})
> - introduce a new message ({{BatchMessage}}) that would encapsulate the
> mutations, expiration, and creation time (similar to {{HintMessage}} in
> CASSANDRA-6230)
> - have MS serialize it directly instead of relying on an intermediate buffer
> To avoid merely shifting the temp buffer to the receiving side(s) we should
> change the structure of the batchlog table to use a list or a map of
> individual mutations.
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