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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/12/03 14:20:00 UTC
[jira] [Work logged] (HIVE-25772) Use ClusteredWriter when writing to Iceberg tables
[ https://issues.apache.org/jira/browse/HIVE-25772?focusedWorklogId=690037&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-690037 ]
ASF GitHub Bot logged work on HIVE-25772:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 03/Dec/21 14:19
Start Date: 03/Dec/21 14:19
Worklog Time Spent: 10m
Work Description: szlta opened a new pull request #2842:
URL: https://github.com/apache/hive/pull/2842
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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Issue Time Tracking
-------------------
Worklog Id: (was: 690037)
Remaining Estimate: 0h
Time Spent: 10m
> 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
> Time Spent: 10m
> 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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