Konstantin Orlov created IGNITE-22466:
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Summary: Sql. Support mapping on backup replicas
Key: IGNITE-22466
URL: https://issues.apache.org/jira/browse/IGNITE-22466
Project: Ignite
Issue Type: Improvement
Components: sql
Reporter: Konstantin Orlov
At the moment, mapping service support mapping only on primary replicas. To
improve data colocation, we may use backup replicas as well for RO queries.
Let's improve mapping service in order to take advantage of backups locality
and minimize amount data sent over the network.
Some failures that should be considered during implementation:
* Replica is not ready yet
* Replica has already gone
* Replica may be too outdated (safeTime of the replica is far behind of
safeTime of the primary)
* Anything else?
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