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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