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From "Jignesh Dhruv (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-1304) DatacenterShardStrategy nodetool ring command shows incorrect/duplicate nodes
Date Tue, 20 Jul 2010 16:55:53 GMT
DatacenterShardStrategy nodetool ring command shows incorrect/duplicate nodes
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                 Key: CASSANDRA-1304
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1304
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Jignesh Dhruv


Hello,

We are planning to use DatacenterShardStrategy for our application. In cassandra-rack.properties
file we define the IP address and the RACK information for each machine and in datacenters.properties
we define how many copies needs to be created in each datacenter.

When we load the data, correct copies gets created in each datacenter however when we run
the ring command using nodeTool, we do not see all the nodes in the cluster.
Say we have 2 DC's and each DC has 5 machines, and one data copy in each datacenter. Now when
we run the ring command we see 7 machines from DC1 and 3 from DC2. i.e. same node from DC1
gets displayed twice or thrice with a different key address.

I believe this is eventually creating problem as the data is not balanced properly within
a datacenter.

Also at times when we run nodeTool-loadBalance data gets moved from one datacenter to another
instead of being balanced within the same datacenter.

Can you please look into this issue?

Thanks,
Jignesh

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