[jira] [Updated] (CASSANDRA-6314) Cassandra sends multiple copies of data over WAN

["Robert Birnie (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-6314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Birnie updated CASSANDRA-6314:
-------------------------------------

    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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