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https://issues.apache.org/jira/browse/HIVE-17852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Laszlo Bodor updated HIVE-17852:
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Attachment: HIVE-17852.21.patch
> remove support for list bucketing "stored as directories" in 3.0
> ----------------------------------------------------------------
>
> Key: HIVE-17852
> URL: https://issues.apache.org/jira/browse/HIVE-17852
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Laszlo Bodor
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-17852.01.patch, HIVE-17852.02.patch,
> HIVE-17852.03.patch, HIVE-17852.04.patch, HIVE-17852.05.patch,
> HIVE-17852.06.patch, HIVE-17852.07.patch, HIVE-17852.08.patch,
> HIVE-17852.09.patch, HIVE-17852.10.patch, HIVE-17852.11.patch,
> HIVE-17852.12.patch, HIVE-17852.13.patch, HIVE-17852.14.patch,
> HIVE-17852.15.patch, HIVE-17852.16.patch, HIVE-17852.17.patch,
> HIVE-17852.18.patch, HIVE-17852.19.patch, HIVE-17852.20.patch,
> HIVE-17852.21.patch
>
>
> From the email thread:
> 1) LB, when stored as directories, adds a lot of low-level complexity to Hive
> tables that has to be accounted for in many places in the code where the
> files are written or modified - from FSOP to ACID/replication/export.
> 2) While working on some FSOP code I noticed that some of that logic is
> broken - e.g. the duplicate file removal from tasks, a pretty fundamental
> correctness feature in Hive, may be broken. LB also doesn’t appear to be
> compatible with e.g. regular bucketing.
> 3) The feature hasn’t seen development activity in a while; it also doesn’t
> appear to be used a lot.
> Keeping with the theme of cleaning up “legacy” code for 3.0, I was proposing
> we remove it.
> (2) also suggested that, if needed, it might be easier to implement similar
> functionality by adding some flexibility to partitions (which LB directories
> look like anyway); that would also keep the logic on a higher level of
> abstraction (split generation, partition pruning) as opposed to many
> low-level places like FSOP, etc.
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