[jira] [Updated] (IGNITE-17179) Thin 3.0: SQL metadata caching

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

     [ https://issues.apache.org/jira/browse/IGNITE-17179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Orlov updated IGNITE-17179:
--------------------------------------
    Epic Link:   (was: IGNITE-16952)

> Thin 3.0: SQL metadata caching
> ------------------------------
>
>                 Key: IGNITE-17179
>                 URL: https://issues.apache.org/jira/browse/IGNITE-17179
>             Project: Ignite
>          Issue Type: Improvement
>          Components: thin client
>    Affects Versions: 3.0.0-alpha5
>            Reporter: Pavel Tupitsyn
>            Assignee: Pavel Tupitsyn
>            Priority: Minor
>              Labels: ignite-3
>             Fix For: 3.0.0-alpha6
>
>
> We send query metadata to the client with every request (IGNITE-17052). It is a waste of resources when the same query is executed frequently.
> * Cache metadata on server, generate unique ID
> * Return the ID to the client
> * Client retrieves cached metadata from server when not known, caches it locally
> However, some queries can be one-off and unique. The cache can grow too big over the lifetime of the application.
> * Use the cache only for queries that have executed N times (detect this on the server)
> * Limit cache size, use LRU eviction (client and server)
> Do not use query text as cache key - column types can change. Use the entire metadata content to check cache entry equality.



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