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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4548) Mutation response(WriteResponse.java) could be smaller and not contain keyspace and key
Date Thu, 30 Aug 2012 23:27:07 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445428#comment-13445428
] 

Brandon Williams commented on CASSANDRA-4548:
---------------------------------------------

+1
                
> Mutation response(WriteResponse.java) could be smaller and not contain keyspace and key
> ---------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4548
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4548
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: sankalp kohli
>            Assignee: Jonathan Ellis
>            Priority: Minor
>              Labels: network
>             Fix For: 1.2.0 beta 1
>
>         Attachments: 4548.txt
>
>
> In the mutation response, WriteResponse.java object is send back to the co-ordinator.
This object has keyspace and key in it which is not required. It is not being used at the
co-ordiantor. 
> This wastes IO specially in case of WAN links between DC. Also since response from each
node in multi-DC deployments goes back to the co-ordinator in another DC makes it even worse.

> It also becomes worse if the the keyspace and key are of large size and the data is small.
In that case, a node which is not the co-ordinator and purely receiving mutations, the outbound
n/w bandwidth could be half of incoming bandwidth.  

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