[jira] [Commented] (HIVE-17001) Insert overwrite table doesn't clean partition directory on HDFS if partition is missing from HMS

["Sergio Peña (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-17001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075406#comment-16075406 ] 

Sergio Peña commented on HIVE-17001:
------------------------------------

[~zsombor.klara] I didn't understand the test case.

{noformat}
# One partition dt='p1' with row ("a",1) is added
insert into test_part partition(dt = 'p1') values ("a", 1);

# Partition metadata is removed only (no data because it is an external table)
alter table test_part drop partition (dt='p1');

# Data is moved
dfs -mv ${system:test.tmp.dir}/test/dt=p1/000000_0 ${system:test.tmp.dir}/test/dt=p1/000000_1;

# Partition is re-created with dt='p1" with row ("b",2)
insert overwrite table test_part partition(dt = 'p1') values ("b", 2);

# This is correct, only one row is seen because the row ("a",1) was moved to another location manually.
# Where is the issue here?
select * from test_part;
{noformat}



> Insert overwrite table doesn't clean partition directory on HDFS if partition is missing from HMS
> -------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-17001
>                 URL: https://issues.apache.org/jira/browse/HIVE-17001
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2, Metastore
>            Reporter: Barna Zsombor Klara
>            Assignee: Barna Zsombor Klara
>         Attachments: HIVE-17001.01.patch
>
>
> Insert overwrite table should clear existing data before creating the new data files.
> For a partitioned table we will clean any folder of existing partitions on HDFS, however if the partition folder exists only on HDFS and the partition definition is missing in HMS, the folder is not cleared.
> Reproduction steps:
> 1. CREATE TABLE test( col1 string) PARTITIONED BY (ds string);
> 2. INSERT INTO test PARTITION(ds='p1') values ('a');
> 3. Copy the data to a different folder with different name.
> 4. ALTER TABLE test DROP PARTITION (ds='p1');
> 5. Recreate the partition directory, copy and rename the data file back
> 6. INSERT INTO test PARTITION(ds='p1') values ('b');
> 7. SELECT * from test;
> will result in 2 records being returned instead of 1.



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