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https://issues.apache.org/jira/browse/CASSANDRA-6314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Birnie updated CASSANDRA-6314:
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Fix Version/s: (was: 1.2.4)
> Cassandra sends multiple copies of data over WAN
> ------------------------------------------------
>
> Key: CASSANDRA-6314
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6314
> Project: Cassandra
> Issue Type: Bug
> Environment: RHEL 6.3, Cassandra 1:1.2.4-1, multi-dc environment
> Reporter: Robert Birnie
>
> Currently Cassandra seems to be sending data directly to all replicas in a
> multi-dc environment rather than to a datacenter specific coordinator node. I
> This should have been fixed in CASSANDRA-1530 (versions .7+). But with
> replication factor 1 for a keyspace in far DC we were sending 25Mbps over the
> WAN, then increasing the RF to 3 increased WAN traffic to 75Mbps. Also,
> after a 10 hour test run with RF=3 an estimate of the data sent over the WAN
> very closely correlated with the data residing on the local disks.
> I'm unsure what other versions this effects. If this is fixed somewhere
> already I would be highly interested but I can't find a Jira ticket regarding
> this.
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