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List:       james-dev
Subject:    [jira] [Updated] (JAMES-3573) Add a Cassandra configuration option for datacenter
From:       "Benoit Tellier (Jira)" <server-dev () james ! apache ! org>
Date:       2021-04-27 11:03:00
Message-ID: JIRA.13375196.1619493514000.348047.1619521380327 () Atlassian ! JIRA
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     [ https://issues.apache.org/jira/browse/JAMES-3573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel \
]

Benoit Tellier updated JAMES-3573:
----------------------------------
    Fix Version/s: 3.7.0

> 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
> 
> 
> 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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