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Posted to issues@hive.apache.org by "Ádám Szita (Jira)" <ji...@apache.org> on 2022/02/10 11:50:00 UTC

[jira] [Assigned] (HIVE-25948) Optimize Iceberg writes by directing records either Clustered- or Fanoutwriter

     [ https://issues.apache.org/jira/browse/HIVE-25948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ádám Szita reassigned HIVE-25948:
---------------------------------


> Optimize Iceberg writes by directing records either Clustered- or Fanoutwriter
> ------------------------------------------------------------------------------
>
>                 Key: HIVE-25948
>                 URL: https://issues.apache.org/jira/browse/HIVE-25948
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ádám Szita
>            Assignee: Ádám Szita
>            Priority: Major
>
> Currently Hive writes Iceberg tables with ClusteredWriter. This has less memory footprint as it only keeps one writer open at a time, but requires the records to be sorted.
> However if data cardinality is low Fanoutwriter is a better choice for performance.
> We should add support so that either can be used, and the decision could be based similarly how currently SortedDynPartitonOptimizer has it.



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