Doug Rohrer created CASSANDRASC-79:
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Summary: Sidecar should be able to load metadata even if the local
instance is unavailable
Key: CASSANDRASC-79
URL: https://issues.apache.org/jira/browse/CASSANDRASC-79
Project: Sidecar for Apache Cassandra
Issue Type: Improvement
Components: Rest API
Reporter: Doug Rohrer
Assignee: Doug Rohrer
Today, the sidecar’s CassandraAdapter/CqlSessionProvider uses a load balancing
policy that only allows connections to a single instance configured for one of
the managed instances of Cassandra. However, this is both unnecessary and
potentially harmful, as requests to that instance’s hostname will fail to
retrieve information like keyspace/cluster metadata when that instance is
unavailable, and will not receive any updates to metadata either, which can
cause stale metadata to be used.
Instead, the CqlSessionProvider should take a list of contact points and use
them to connect to the whole cluster (or a subset of nodes) without the
single-instance load balancing policy. Where it is necessary to query an
individual instance (system tables, attempts to check the health of a
particular instance) we can, instead, use the driver’s ability to direct
queries to a specific host on a per-statement basis.
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