Robert Birnie created CASSANDRA-6314:
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Summary: 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
Fix For: 1.2.4
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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