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https://issues.apache.org/jira/browse/HIVE-26699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajesh Balamohan updated HIVE-26699:
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Summary: Iceberg: S3 fadvise can hurt JSON parsing significantly (was:
Iceberg: S3 fadvise can hurt JSON parsing significantly in DWX)
> Iceberg: S3 fadvise can hurt JSON parsing significantly
> -------------------------------------------------------
>
> Key: HIVE-26699
> URL: https://issues.apache.org/jira/browse/HIVE-26699
> Project: Hive
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> Hive reads JSON metadata information (TableMetadataParser::read()) multiple
> times; E.g during query compilation, AM split computation, stats computation,
> during commits etc.
>
> With large JSON files (due to multiple inserts), it takes a lot longer time
> with S3 FS with "fs.s3a.experimental.input.fadvise" set to "random". (e.g in
> the order of 10x).To be on safer side, it will be good to set this to
> "normal" mode in configs, when reading iceberg tables.
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