[jira] [Work started] (HIVE-23354) Remove file size sanity checking from compareTempOrDuplicateFiles

["John Sherman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-23354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-23354 started by John Sherman.
-------------------------------------------
> Remove file size sanity checking from compareTempOrDuplicateFiles
> -----------------------------------------------------------------
>
>                 Key: HIVE-23354
>                 URL: https://issues.apache.org/jira/browse/HIVE-23354
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>            Reporter: John Sherman
>            Assignee: John Sherman
>            Priority: Major
>         Attachments: HIVE-23354.1.patch
>
>
> [https://github.com/apache/hive/blob/cdd55aa319a3440963a886ebfff11cd2a240781d/ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java#L1952-L2010]
>  compareTempOrDuplicateFiles uses a combination of attemptId and fileSize to determine which file(s) to keep.
>  I've seen instances where this function throws an exception due to the fact that the newer attemptId file size is less than the older attemptId (thus failing the query).
>  I think this assumption is faulty, due to various factors such as file compression and the order in which values are written. It may be prudent to trust that the newest attemptId is in fact the best choice.



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