[jira] [Commented] (HIVE-25535) Control cleaning obsolete directories/files of a table via property

["Denys Kuzmenko (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-25535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17698381#comment-17698381 ] 

Denys Kuzmenko commented on HIVE-25535:
---------------------------------------

[~ashish-kumar-sharma], why are you calling `txnHandler.markCleaned(ci)` if isNoCleanUpSet? in case of aborts, we are going to remove the metadata that would make the aborted data considered valid.

> Control cleaning obsolete directories/files of a table via property
> -------------------------------------------------------------------
>
>                 Key: HIVE-25535
>                 URL: https://issues.apache.org/jira/browse/HIVE-25535
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ashish Sharma
>            Assignee: Ashish Sharma
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0-alpha-1
>
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> *Use Case* - 
> When external tool like [SPARK_ACID |https://github.com/qubole/spark-acid]try to access hive metastore directly instead of accessing LLAP or hs2 which lacks the ability of take acquires locks on the metastore artefacts. Due to which if any spark acid jobs starts and at the same time compaction happens in hive with leads to exceptions like *FileNotFound* for delta directory because at time of spark acid compilation phase delta files are present but when execution start delta files are deleted by compactor. 
> Inorder to tackle problem like this I am proposing to add a config "NO_CLEANUP" is table properties and partition properties which provide higher control on table and partition compaction process. 
> We already have "[HIVE_COMPACTOR_DELAYED_CLEANUP_ENABLED|https://github.com/apache/hive/blob/71583e322fe14a0cfcde639629b509b252b0ed2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L3243]" which allow us to delay the deletion of "obsolete directories/files" but it is applicable to all the table in metastore where this config will provide table and partition level control.
> *Solution* - 
> Add "NO_CLEANUP" in the table properties enable/disable the table-level and partition cleanup and prevent the cleaner process from automatically cleaning obsolete directories/files.
> Example - 
> ALTER TABLE <tablename> SET TBLPROPERTIES('NO_CLEANUP'=FALSE/TRUE);



--
This message was sent by Atlassian Jira
(v8.20.10#820010)