[jira] [Created] (HIVE-16666) Set hive.exec.stagingdir=./* will cause Hive to delete the intermediate query results

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

yangfang created HIVE-16666:
-------------------------------

             Summary: Set hive.exec.stagingdir=./* will cause Hive to delete the intermediate query results
                 Key: HIVE-16666
                 URL: https://issues.apache.org/jira/browse/HIVE-16666
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 2.1.1
            Reporter: yangfang
            Assignee: yangfang
            Priority: Critical


Set hive.exec.stagingdir=./*,  for example set hive.exec.stagingdir=./opq8.
Then excute a query like this:
insert overwrite table test2 select * from test3; 
You will get the error like this:
hive> set hive.exec.stagingdir=./opq8;
hive> insert overwrite table test2 select * from test3;
Query ID = mr_20170515134831_28ee392d-0d5a-4e47-b80c-dfcd31691b02
Total jobs = 3
Launching Job 1 out of 3
Number of reduce tasks is set to 0 since there's no reduce operator
Starting Job = job_1494818119523_0008, Tracking URL = http://zdh77:8088/proxy/application_1494818119523_0008/
Kill Command = /opt/ZDH/parcels/lib/hadoop/bin/hadoop job  -kill job_1494818119523_0008
Hadoop job information for Stage-1: number of mappers: 0; number of reducers: 0
2017-05-15 13:48:51,487 Stage-1 map = 0%,  reduce = 0%
Ended Job = job_1494818119523_0008
Stage-3 is selected by condition resolver.
Stage-2 is filtered out by condition resolver.
Stage-4 is filtered out by condition resolver.
Moving data to directory hdfs://nameservice/hive/test2/opqt8_hive_2017-05-15_13-48-31_558_6151032330134038151-1/-ext-10000
Loading data to table default.test2
Moved: 'hdfs://nameservice/hive/test2/opqt8_hive_2017-05-15_13-48-31_558_6151032330134038151-1' to trash at: hdfs://nameservice/user/mr/.Trash/Current
Failed with exception Unable to move source hdfs://nameservice/hive/test2/opqt8_hive_2017-05-15_13-48-31_558_6151032330134038151-1/-ext-10000 to destination hdfs://nameservice/hive/test2
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MoveTask. Unable to move source hdfs://nameservice/hive/test2/opqt8_hive_2017-05-15_13-48-31_558_6151032330134038151-1/-ext-10000 to destination hdfs://nameservice/hive/test2
MapReduce Jobs Launched: 
Stage-Stage-1:  HDFS Read: 0 HDFS Write: 0 SUCCESS
Total MapReduce CPU Time Spent: 0 msec
hive>

I set hive.exec.stagingdir=./opq8 is a relative path for destination write directory  /hive/test2.  Hive will create a temporary directory /hive/test2/opq8_hive* for intermediate query results.  Later in the move staging, Hive will delete or trash the sub directory under the /hive/test2 if the directory name does not begin with "_" or "."  in order to move data to this directory. You can see its processing logic in org.apache.hadoop.hive.ql.metadata.trashFilesUnderDir.
My modification method is: if  stagingdir is a sub directory of the destination write directory. I add a "."   in front of stagingdir. now temporary directory will be /hive/test2/.opq8_hive* , because the sub directory .opq8_hive* starts with "." Hive will not delete it.
hive> set hive.exec.stagingdir=./opq8;
hive>  insert overwrite table test2 select * from test3;
Query ID = mr_20170515143940_ae48a65e-42be-4f50-b974-b713ca902867
Total jobs = 3
Launching Job 1 out of 3
Number of reduce tasks is set to 0 since there's no reduce operator
Starting Job = job_1494818119523_0012, Tracking URL = http://zdh77:8088/proxy/application_1494818119523_0012/
Kill Command = /opt/ZDH/parcels/lib/hadoop/bin/hadoop job  -kill job_1494818119523_0012
Hadoop job information for Stage-1: number of mappers: 0; number of reducers: 0
2017-05-15 14:40:04,547 Stage-1 map = 0%,  reduce = 0%
Ended Job = job_1494818119523_0012
Stage-3 is selected by condition resolver.
Stage-2 is filtered out by condition resolver.
Stage-4 is filtered out by condition resolver.
Moving data to directory hdfs://nameservice/hive/test2/.opqt8_hive_2017-05-15_14-39-40_751_1221840798987515724-1/-ext-10000
Loading data to table default.test2
MapReduce Jobs Launched: 
Stage-Stage-1:  HDFS Read: 0 HDFS Write: 0 SUCCESS
Total MapReduce CPU Time Spent: 0 msec
OK
Time taken: 26.751 seconds
hive> 



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