Benoit Tellier created JAMES-3573:
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Summary: 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
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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