I am experiencing an issue where replication is not being distributed
between racks when using PropertyFileSnitch in conjunction with
NetworkTopologyStrategy.
I am running 0.7.3 from a tar.gz on cassandra.apache.org
I have 4 nodes, 2 data centers, and 2 racks in each data center. Each
rack has 1 node.
I have even token distribution so that each node gets 25%:
0
425352958651173079329218259289
71026432
85070591730234615865843651857942052864
127605887595351923798765477786913079296
My cassandra-topology.properties is as follows:
# Cassandra Node IP=Data Center:Rack
ffff\:0\:ffff\:eeee\:\:fffe=NY1:RAC1
ffff\:0\:ffff\:eeee\:\:ffff=NY1:RAC2
ffff\:0\:ffff\:ffff\:\:fffe=LA1:RAC1
ffff\:0\:ffff\:ffff\:\:ffff=LA1:RAC2
# default for unknown nodes
default=NY1:RAC1
My Keyspace replication strategy is as follows:
Keyspace: SipTrace:
Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy
Options: [LA1:1,NY1:1]
So each data center should get 1 copy of the data, and this does
happen. The problem is that the replicated copies get pinned to the
first host configured in the properties file, from what I can discern,
and DO NOT distribute between racks. So I have 2 nodes that have a 4
to 1 ratio of data compared to the other 2 nodes. This is a problem!
Can any one please tell me if I have misconfigured this? Or how I can
get replica data to distribute evenly between racks within a
datacenter? I was led to believe that cassandra will try to
distribute between racks for replica data automatically under this
setup.
Thank you for your help in advance!
-Eric
