[jira] [Created] (CASSSIDECAR-495) Report each instance's own Sidecar instance id in the ring / token-range-replicas response

["Bianca Stanciu (Jira)" <ji...@apache.org>]

Bianca Stanciu created CASSSIDECAR-495:
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             Summary: Report each instance's own Sidecar instance id in the ring / token-range-replicas response
                 Key: CASSSIDECAR-495
                 URL: https://issues.apache.org/jira/browse/CASSSIDECAR-495
             Project: Sidecar for Apache Cassandra
          Issue Type: Improvement
          Components: Rest API
            Reporter: Bianca Stanciu
            Assignee: Bianca Stanciu


*+Problem:+*
Analytics clients that talk to Sidecar behind a load balancer cannot tell which
physical Cassandra instance a request will land on. When several instances are
reachable only through one shared address (a load-balancer endpoint), the client
has no way to attach the correct per-instance routing id per request.

Two cassandra-analytics PRs work around this today, and both converge on the same
missing server capability:
- [CASSANALYTICS-177 / apache/cassandra-analytics#222 |https://github.com/apache/cassandra-analytics/pull/222]— adds an instanceId query
  param to fix HTTP 421 routing. It can only resolve per-instance ids from static
  address-keyed config, so it fails fast (“Duplicate key” / ambiguous-config error)
  when instances share an address.
- [CASSANALYTICS-181 / apache/cassandra-analytics#223 |https://github.com/apache/cassandra-analytics/pull/223]— time-skew validation behind
  a load balancer; sidesteps per-replica addressing by querying the LB directly.

Include each replica’s own Sidecar instance id in the ring / token-range-replicas
response, so clients can resolve routing coverage from the live ring itself rather
than from static, address-keyed configuration.



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