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Posted to commits@cassandra.apache.org by "T Jake Luciani (JIRA)" <ji...@apache.org> on 2010/11/30 21:40:13 UTC
[jira] Commented: (CASSANDRA-1530) More-efficient cross-DC
replication
[ https://issues.apache.org/jira/browse/CASSANDRA-1530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965417#action_12965417 ]
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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