[jira] [Assigned] (HIVE-17231) ColumnizedDeleteEventRegistry.DeleteReaderValue optimization

["Eugene Koifman (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-17231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eugene Koifman reassigned HIVE-17231:
-------------------------------------

    Assignee: Eugene Koifman

> ColumnizedDeleteEventRegistry.DeleteReaderValue optimization
> ------------------------------------------------------------
>
>                 Key: HIVE-17231
>                 URL: https://issues.apache.org/jira/browse/HIVE-17231
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Transactions
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Major
>         Attachments: HIVE-17231.01.patch
>
>
>      For unbucketed tables DeleteReaderValue will currently return all delete events.  Once we trust that
>      the N in bucketN for "base" spit is reliable, all delete events not matching N can be skipped.
> This is useful to protect against extreme cases where someone runs an update/delete on a partition that matches 10 billion rows thus generates very many delete events.
> Since HIVE-19890 all acid data files must have bucketid/writerid in the file name match bucketid/writerid in ROW__ID in the data.
> {{OrcRawRecrodMerger.getDeltaFiles()}} should only return files representing the right {{bucket}}



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