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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-19838) simplify & fix ColumnizedDeleteEventRegistry load loop
Date Mon, 11 Jun 2018 23:08:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-19838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508926#comment-16508926
] 

Sergey Shelukhin commented on HIVE-19838:
-----------------------------------------

Hmm... if you look at the below code in the current master, it does count each bp change as
being distinct OWID.
So this patch keeps that behavior, that doesn't change.

> simplify & fix ColumnizedDeleteEventRegistry load loop
> ------------------------------------------------------
>
>                 Key: HIVE-19838
>                 URL: https://issues.apache.org/jira/browse/HIVE-19838
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Major
>         Attachments: HIVE-19838.01.patch, HIVE-19838.patch
>
>
> Apparently sometimes the delete count in ACID stats doesn't match what merger actually
returns.
> It could be due to some deltas having duplicate deletes from parallel queries (I guess?)
that are being squashed by the merger or some other reasons beyond my mortal comprehension.
> The loop assumes the merger will return the exact number of records, so it fails with
array index exception. Also, it could actually be done in a single loop.



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