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List:       cassandra-commits
Subject:    [jira] Commented: (CASSANDRA-1530) More-efficient cross-DC
From:       "T Jake Luciani (JIRA)" <jira () apache ! org>
Date:       2010-11-30 20:40:13
Message-ID: 6736574.34471291149613039.JavaMail.jira () thor
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T Jake Luciani commented on CASSANDRA-1530:
-------------------------------------------

One minor concern here is the response timeout for the coordinating node.  

Would it make sense to do timeout*2 for this node since we are adding extra latency? 

> More-efficient cross-DC replication
> -----------------------------------
> 
> Key: CASSANDRA-1530
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1530
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: T Jake Luciani
> Fix For: 0.7.1
> 
> Attachments: 1530-cleaned.txt, 1530-joaquin.txt
> 
> 
> Currently the coordinator node sends writes to each replica.  In multi-dc \
> situations, it would be more efficient to have the coordinator talk to a single \
> node in each DC, which would forward the writes to the other replicas local to it.  \
> (All replicas would continue to ack to the coordinator.) Shouldn't be difficult to \
> add a header to RMVH saying "consult the Strategy to see who else is local to you \
> and queue it off to them as well." For example, consider two data centers with the \
>                 following nodes:
> DC1: A, B, C
> DC2: D, E, F
> A client connected to node A performs an insert that should be replicated to \
> {B,C,E,F}.  Currently, A will send a MUTATION verb to each of those nodes directly. \
> But communication to E and F is relatively expensive since they are in the other \
> data center from A.  So we'd like to send the mutation to just one, say E, with a \
> tag saying "forward this to F as well."

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