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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-492) Data Center Quorum
Date Thu, 15 Oct 2009 05:20:33 GMT
Data Center Quorum
------------------

                 Key: CASSANDRA-492
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-492
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
    Affects Versions: 0.5
         Environment: Cassandra Core Code
            Reporter: Vijay
            Priority: Minor
             Fix For: 0.5


Need a Cassandra Datacenter Quorum Read and Datacenter Quorum Write.

Add 1 new enum DC_Quorum. basically reads with this will not span across the datacenter it
will use the existing nodes in the Datacenter which has this data and read from it.
For writes - All the data centers need to get this data, (datac enters will be configured
in the storage-config.xml and number of replicas in it). Once configured write will basically
write to all the nodes in all the datacenter but will wait only for the write in the current
datacenter. 
Example: We have 3 Datacenter A,B,C A has a replication factor of 3, B has 2 and C has 2.
DC_Quorum write will make sure to write on 2 of 3 nodes in A.... B and C (total 4 +1) nodes
will be eventually consistent.

Changes will be in RackAware, storage, read and write classes.

Thanks
Vijay

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