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Posted to issues-all@impala.apache.org by "Quanlong Huang (Jira)" <ji...@apache.org> on 2024/04/09 07:52:00 UTC

[jira] [Assigned] (IMPALA-9703) Skip loading partition meta and file meta for PB scale tables

     [ https://issues.apache.org/jira/browse/IMPALA-9703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang reassigned IMPALA-9703:
--------------------------------------

    Assignee: Zhi Tang

> Skip loading partition meta and file meta for PB scale tables
> -------------------------------------------------------------
>
>                 Key: IMPALA-9703
>                 URL: https://issues.apache.org/jira/browse/IMPALA-9703
>             Project: IMPALA
>          Issue Type: New Feature
>          Components: Catalog
>            Reporter: Quanlong Huang
>            Assignee: Zhi Tang
>            Priority: Critical
>              Labels: catalog-2024
>
> PB scale tables that have >100K partitions may hit catalog limitations. Caching all the partitions is also a waste since usually only few of them are required. Queries scanning all partitions probably fail with resource limitation errors so it's not in our consideration.
> This JIRA tracks the work to skip caching partition meta of a table. Catalogd will only cache the HmsTable object and partition list (partition names, e.g. "p1=a/p2=b" and internal partition ids generated by Impala). Coordinators fetch the partition meta on-demand when compiling queries.



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