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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12229) Move streaming to non-blocking IO and netty (streaming 2.1)
Date Thu, 06 Apr 2017 18:56:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15959536#comment-15959536
] 

Jason Brown commented on CASSANDRA-12229:
-----------------------------------------

Had an offline conversation with [~cnlwsu], and he explained to me that this code breaks external
tools, like BulkLoader. This is because if the BulkLoader is running on the same box as a
c* node, the BulkLoader won't be able to bind to an address to listen to callbacks from the
c* process (amongst other things). Thus, I'm gonna have to rethink that part - it shouldn't
affect things too much. Stay tuned.

> 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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