[jira] [Resolved] (HIVE-25772) Use ClusteredWriter when writing to Iceberg tables

["Ádám Szita (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-25772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ádám Szita resolved HIVE-25772.
-------------------------------
    Fix Version/s: 4.0.0
       Resolution: Fixed

Pushed to master. Thanks for the review [~Marton Bod]!

> Use ClusteredWriter when writing to Iceberg tables
> --------------------------------------------------
>
>                 Key: HIVE-25772
>                 URL: https://issues.apache.org/jira/browse/HIVE-25772
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ádám Szita
>            Assignee: Ádám Szita
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> Currently Hive relies on PartitionedFanoutWriter to write records to Iceberg tables. This has a big disadvantage when it comes to writing many-many partitions, as it keeps a file handle open to each of the partitions.
> For some file systems like S3, there can be a big resource waste due to keeping bytebuffers for each of the handles, that may result in OOM scenarios.
> ClusteredWriter will only write one file at a time, and will not keep other file handles open, but it will expect that the input data is sorted by partition keys.



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