[jira] Updated: (CASSANDRA-1066) DatacenterShardStrategy needs enforceable and keyspace based RF

["Jeremy Hanna (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-1066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jeremy Hanna updated CASSANDRA-1066:
------------------------------------

    Attachment: 1066.txt

Still having some issues with a couple of unit tests, but posting the current changes.

> DatacenterShardStrategy needs enforceable and keyspace based RF
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-1066
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1066
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jeremy Hanna
>            Assignee: Jeremy Hanna
>            Priority: Minor
>             Fix For: 0.7.0
>
>         Attachments: 1066-changes-patch.txt, 1066.txt
>
>
> Currently, the DatacenterShardStrategy reads in a properties file - datacenters.properties - to get a per-datacenter replication factor.  So any keyspace that is using the DSS in the cluster is using that same properties file to configure its replication factor.  The implementation doesn't take into account the per-keyspace replication factor, but it is assumed that the sum of all the datacenter RF values equals the per-keyspace replication value that is part of the keyspace metadata.
> It seems that an improvement could be two-fold:
> 1. Enforce the replication factor for the keyspace as always equal the sum of all the datacenter RF values.  Otherwise, if they aren't equal, bad things (tm) can happen.
> 2. Make the datacenter RF values part of the keyspace metadata rather than a global value.  Again, currently if any keyspace in the cluster is configured to use DSS, it will be using the global DC RF values found in the properties file.  An improvement could be to instead of having the properties file, configure that on a per keyspace basis.  That would make the cluster more multi-tenant friendly so it could be flexible with multiple keyspaces.

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