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https://issues.apache.org/jira/browse/HIVE-15880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vihang Karajgaonkar updated HIVE-15880:
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Attachment: HIVE-15880.03.patch
The tests were working for me locally. Changed the implementation of the tests
to make it more robust. Also, added more logs in the test case to help
debugging in case it fails again. Added couple of more tests
> Allow insert overwrite query to use auto.purge table property
> -------------------------------------------------------------
>
> Key: HIVE-15880
> URL: https://issues.apache.org/jira/browse/HIVE-15880
> Project: Hive
> Issue Type: Improvement
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
> Attachments: HIVE-15880.01.patch, HIVE-15880.02.patch,
> HIVE-15880.03.patch
>
>
> It seems inconsistent that auto.purge property is not considered when we do a
> INSERT OVERWRITE while it is when we do a DROP TABLE
> Drop table doesn't move table data to Trash when auto.purge is set to true
> {noformat}
> > create table temp(col1 string, col2 string);
> No rows affected (0.064 seconds)
> > alter table temp set tblproperties('auto.purge'='true');
> No rows affected (0.083 seconds)
> > insert into temp values ('test', 'test'), ('test2', 'test2');
> No rows affected (25.473 seconds)
> # hdfs dfs -ls /user/hive/warehouse/temp
> Found 1 items
> -rwxrwxrwt 3 hive hive 22 2017-02-09 13:03
> /user/hive/warehouse/temp/000000_0
> #
> > drop table temp;
> No rows affected (0.242 seconds)
> # hdfs dfs -ls /user/hive/warehouse/temp
> ls: `/user/hive/warehouse/temp': No such file or directory
> #
> # sudo -u hive hdfs dfs -ls /user/hive/.Trash/Current/user/hive/warehouse
> #
> {noformat}
> INSERT OVERWRITE query moves the table data to Trash even when auto.purge is
> set to true
> {noformat}
> > create table temp(col1 string, col2 string);
> > alter table temp set tblproperties('auto.purge'='true');
> > insert into temp values ('test', 'test'), ('test2', 'test2');
> # hdfs dfs -ls /user/hive/warehouse/temp
> Found 1 items
> -rwxrwxrwt 3 hive hive 22 2017-02-09 13:07
> /user/hive/warehouse/temp/000000_0
> #
> > insert overwrite table temp select * from dummy;
> # hdfs dfs -ls /user/hive/warehouse/temp
> Found 1 items
> -rwxrwxrwt 3 hive hive 26 2017-02-09 13:08
> /user/hive/warehouse/temp/000000_0
> # sudo -u hive hdfs dfs -ls /user/hive/.Trash/Current/user/hive/warehouse
> Found 1 items
> drwx------ - hive hive 0 2017-02-09 13:08
> /user/hive/.Trash/Current/user/hive/warehouse/temp
> #
> {noformat}
> While move operations are not very costly on HDFS it could be significant
> overhead on slow FileSystems like S3. This could improve the performance of
> {{INSERT OVERWRITE TABLE}} queries especially when there are large number of
> partitions on tables located on S3 should the user wish to set auto.purge
> property to true
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