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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20699) Query based compactor for full CRUD Acid tables
Date Tue, 29 Jan 2019 02:09:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16754507#comment-16754507
] 

Eugene Koifman commented on HIVE-20699:
---------------------------------------

I left a few of minor comments on RB for patch 9.  Overall LGTM, except for {{HIVE_TRANSACTIONAL_TABLE_SCAN}} not
being visible in {{HiveSplitGenerator}}.  While not caused by this patch I don't think it
can properly work in production w/o it being fixed.

> Query based compactor for full CRUD Acid tables
> -----------------------------------------------
>
>                 Key: HIVE-20699
>                 URL: https://issues.apache.org/jira/browse/HIVE-20699
>             Project: Hive
>          Issue Type: New Feature
>          Components: Transactions
>    Affects Versions: 3.1.0
>            Reporter: Eugene Koifman
>            Assignee: Vaibhav Gumashta
>            Priority: Major
>         Attachments: HIVE-20699.1.patch, HIVE-20699.1.patch, HIVE-20699.2.patch, HIVE-20699.3.patch,
HIVE-20699.4.patch, HIVE-20699.5.patch, HIVE-20699.6.patch, HIVE-20699.7.patch, HIVE-20699.8.patch,
HIVE-20699.9.patch
>
>
> Currently the Acid compactor is implemented as generated MR job ({{CompactorMR.java}}).
> It could also be expressed as a Hive query that reads from a given partition and writes
data back to the same partition.  This will merge the deltas and 'apply' the delete events.
 The simplest would be to just use Insert Overwrite but that will change all ROW__IDs which
we don't want.
> Need to implement this in a way that preserves ROW__IDs and creates a new {{base_x}}
directory to handle Major compaction.
> Minor compaction will be investigated separately.



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