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Posted to dev@hive.apache.org by "Ádám Szita (Jira)" <ji...@apache.org> on 2021/12/03 14:14:00 UTC

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

Ádám Szita created HIVE-25772:
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             Summary: 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


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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