[jira] [Closed] (JAMES-3573) Add a Cassandra configuration option for datacenter

["Benoit Tellier (Jira)" <se...@james.apache.org>]

     [ https://issues.apache.org/jira/browse/JAMES-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benoit Tellier closed JAMES-3573.
---------------------------------
    Resolution: Fixed

> Add a Cassandra configuration option for datacenter
> ---------------------------------------------------
>
>                 Key: JAMES-3573
>                 URL: https://issues.apache.org/jira/browse/JAMES-3573
>             Project: James Server
>          Issue Type: Improvement
>          Components: cassandra
>            Reporter: Benoit Tellier
>            Priority: Major
>             Fix For: 3.7.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> h3. Why
> The data-center is not specified in the James Cassandra driver. As such, James do not have an understanding of its locality and might involve Cassandra nodes of the other DCs in its operations despite using LOCAL_SERIAL, LOCAL_QUORUM...
> h3. How
> add the `local.dc` configuration option in `cassandra.properties` file
> {code:java}
> local.dc=DC1
> {code}
> Should result in the cluster builder doing:
> {code:java}
> Cluster.Builder clusterBuilder = Cluster.builder()
>     .withoutJMXReporting()
>     .withLoadBalancingPolicy(new TokenAwarePolicy(DCAwareRoundRobinPolicy.builder()
>         .withLocalDc("DC1")
>         .build()));
> {code}
> Note that this is the default load-balancing policy:
> {code:java}
> new TokenAwarePolicy(DCAwareRoundRobinPolicy.builder().build())
> {code}
> h3. References
> See https://stackoverflow.com/questions/48519462/usage-of-the-local-quorum-consistency-level-in-datastax-driver for instance



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