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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-13988) zero length file is being created for empty bucket in tez mode
Date Thu, 09 Jun 2016 23:44:21 GMT
Pengcheng Xiong created HIVE-13988:
--------------------------------------

             Summary: zero length file is being created for empty bucket in tez mode
                 Key: HIVE-13988
                 URL: https://issues.apache.org/jira/browse/HIVE-13988
             Project: Hive
          Issue Type: Bug
            Reporter: Pengcheng Xiong
            Assignee: Pengcheng Xiong


Even though bucket is empty, zero length file is being created in tez mode. 

steps to reproduce the issue:
{noformat}
hive> set hive.execution.engine;
hive.execution.engine=tez
hive> drop table if exists emptybucket_orc;
OK
Time taken: 5.416 seconds
hive> create table emptybucket_orc(age int) clustered by (age) sorted by (age) into 99
buckets stored as orc;
OK
Time taken: 0.493 seconds
hive> insert into table emptybucket_orc select distinct(age) from studenttab10k limit 0;
Query ID = hrt_qa_20160523231955_8b981be7-68c4-4416-8a48-5f8c7ff551c3
Total jobs = 1
Launching Job 1 out of 1


Status: Running (Executing on YARN cluster with App id application_1464045121842_0002)

----------------------------------------------------------------------------------------------
        VERTICES      MODE        STATUS  TOTAL  COMPLETED  RUNNING  PENDING  FAILED  KILLED
 
----------------------------------------------------------------------------------------------
Map 1 ..........      llap     SUCCEEDED      1          1        0        0       0     
 0  
Reducer 2 ......      llap     SUCCEEDED      1          1        0        0       0     
 0  
Reducer 3 ......      llap     SUCCEEDED      1          1        0        0       0     
 0  
Reducer 4 ......      llap     SUCCEEDED     99         99        0        0       0     
 0  
----------------------------------------------------------------------------------------------
VERTICES: 04/04  [==========================>>] 100%  ELAPSED TIME: 11.00 s    
----------------------------------------------------------------------------------------------
Loading data to table default.emptybucket_orc
OK
Time taken: 16.907 seconds
hive> dfs -ls /apps/hive/warehouse/emptybucket_orc;
Found 99 items
-rwxrwxrwx   3 hrt_qa hdfs          0 2016-05-23 23:20 /apps/hive/warehouse/emptybucket_orc/000000_0
-rwxrwxrwx   3 hrt_qa hdfs          0 2016-05-23 23:20 /apps/hive/warehouse/emptybucket_orc/000001_0
......
{noformat}

Expected behavior:
In tez mode, zero length file shouldn't get created on hdfs if bucket is empty



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