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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-12229) Move streaming to non-blocking IO and netty (streaming 2.1)
Date Mon, 13 Mar 2017 13:24:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15907450#comment-15907450
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Jason Brown edited comment on CASSANDRA-12229 at 3/13/17 1:24 PM:
------------------------------------------------------------------

Current work here: https://github.com/jasobrown/cassandra/compare/8457...jasobrown:12229?expand=1

Note: as this patch is based on the current 8457, I've created a PR based on the diff between
the current 8457 and this ticket, as comparing against trunk would show too much difference
(and pulling along 8457 changes, as well).


was (Author: jasobrown):
Patch here: https://github.com/jasobrown/cassandra/compare/8457...jasobrown:12229?expand=1

Note: as this patch is based on the current 8457, I've created a PR based on the diff between
the current 8457 and this ticket, as comparing against trunk would show too much difference
(and pulling along 8457 changes, as well).

> 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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