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