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https://issues.apache.org/jira/browse/CASSANDRA-1530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-1530:
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Attachment: 1530-cleaned.txt
cleaned up version attached.
one thing that should definitely be fixed is using raw address bytes in the
forwarding header -- an address is always the same length as
FBUtilitites.getLocalAddress length. Hint addresses are UTF8-encoded so they
play nice with the old OPP encoding when we save them; that is not a concern
here.
Would also be good to make hinting DC-aware (and prefer storing hints on
replicas in the same DC as the dead node) but we can make that a separate
ticket if necessary.
> 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
> 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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