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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-9673) Improve batchlog write path
Date Mon, 13 Jul 2015 10:39:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14624500#comment-14624500
] 

Aleksey Yeschenko edited comment on CASSANDRA-9673 at 7/13/15 10:38 AM:
------------------------------------------------------------------------

Yes, I thought I mentioned it offline (and it should really all be in the ticket, either way,
so my bad). The mutations will now be stored in a map {{<something, blob>}}.

The missing, and, again, unexplained part is that we don't decode the message from {{ByteBuffer}}
s into {{Mutation}} s on the receiving side. There is no point in doing so, given that only
replay needs the {{Mutation}} objects.


was (Author: iamaleksey):
Yes, I thought I mentioned it offline (and it should really all be in the ticket, either way,
so my bad). The mutations will now be stored in a map {{<something, blob>>}}.

The missing, and, again, unexplained part is that we don't decode the message from {{ByteBuffer}}s
into {{Mutation}}s on the receiving side.

> 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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