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https://issues.apache.org/jira/browse/CASSANDRA-12229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16033074#comment-16033074
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Jason Brown commented on CASSANDRA-12229:
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[~JoshuaMcKenzie] now that you're reviewed my jira comments, why don't you
review some the code, as well :D
> Move streaming to non-blocking IO and netty (streaming 2.1)
> -----------------------------------------------------------
>
> Key: CASSANDRA-12229
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12229
> Project: Cassandra
> Issue Type: Improvement
> Components: Streaming and Messaging
> Reporter: Jason Brown
> Assignee: Jason Brown
> Fix For: 4.0
>
>
> As followup work to CASSANDRA-8457, we need to move streaming to use netty.
> Streaming 2.0 (CASSANDRA-5286) brought many good improvements to how files
> are transferred between nodes in a cluster. However, the low-level details of
> the current streaming implementation does not line up nicely with a
> non-blocking model, so I think this is a good time to review some of those
> details and add in additional goodness. The current implementation assumes a
> sequential or "single threaded" approach to the sending of stream messages as
> well as the transfer of files. In short, after several iterative prototypes,
> I propose the following:
> 1) use a single bi-diredtional connection (instead of requiring to two
> sockets & two threads)
> 2) send the "non-file" {{StreamMessage}} s (basically anything not
> {{OutboundFileMessage}}) via the normal internode messaging. This will
> require a slight bit more management of the session (the ability to look up a
> {{StreamSession}} from a static function on {{StreamManager}}, but we have
> have most of the pieces we need for this already.
> 3) switch to a non-blocking IO model (facilitated via netty)
> 4) Allow files to be streamed in parallel (CASSANDRA-4663) - this should just
> be a thing already
> 5) If the entire sstable is to streamed, in addition to the DATA component,
> transfer all the components of the sstable (primary index, bloom filter,
> stats, and so on). This way we can avoid the CPU and GC pressure from
> deserializing the stream into objects. File streaming then amounts to a
> block-level transfer.
> Note: The progress/results of CASSANDRA-11303 will need to be reflected here,
> as well.
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