Rajesh Balamohan created HIVE-26699: ---------------------------------------
Summary: Iceberg: S3 fadvise can hurt JSON parsing significantly in DWX Key: HIVE-26699 URL: https://issues.apache.org/jira/browse/HIVE-26699 Project: Hive Issue Type: Improvement Reporter: Rajesh Balamohan 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. -- This message was sent by Atlassian Jira (v8.20.10#820010)