[jira] [Updated] (IGNITE-22466) Sql. Support mapping to non-primary replicas

["Konstantin Orlov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-22466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Orlov updated IGNITE-22466:
--------------------------------------
    Summary: Sql. Support mapping to non-primary replicas  (was: Sql. Support mapping on backup replicas)

> Sql. Support mapping to non-primary replicas
> --------------------------------------------
>
>                 Key: IGNITE-22466
>                 URL: https://issues.apache.org/jira/browse/IGNITE-22466
>             Project: Ignite
>          Issue Type: Improvement
>          Components: sql
>            Reporter: Konstantin Orlov
>            Assignee: Konstantin Orlov
>            Priority: Major
>              Labels: ignite-3
>             Fix For: 3.0.0-beta2
>
>
> 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  * Replica may be too outdated (safeTime of the replica is far behind of safeTime of the primary)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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