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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Resolved] (CASSANDRA-6314) Cassandra sends multiple copies of data over WAN
Date Fri, 08 Nov 2013 02:28:17 GMT


Jonathan Ellis resolved CASSANDRA-6314.

    Resolution: Duplicate

> Cassandra sends multiple copies of data over WAN
> ------------------------------------------------
>                 Key: CASSANDRA-6314
>                 URL:
>             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.
> 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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