Vineet Singh created HADOOP-15260:

             Summary: Hive queries on tez are overwriting records on azure wasb 
                 Key: HADOOP-15260
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs/azure
    Affects Versions: 2.7.3
         Environment: This scenario occurs on hdp 2.5(hadoop 2.7.3) hdfs on 
WASB microsoft Azure platform.
The same query yields proper result on regular hdfs on hdp 2.5(hadoop 2.7.3) on 
premise cluster.
            Reporter: Vineet Singh
         Attachments: On Premise Cluster.JPG, azure cloud.JPG, sample_query.txt

When running multiple hive queries on Tez (see example ) the same mapper task 
number gets overwritten by the next union query. As seen in the azure snapshot 
the directories /1 ,2 ...,100 get overwritten again and again since the mapper 
numbers launch write again and again in the same directories.

But in the on premise hadoop cluster version 2.7.3 . The directories are 
created as 1_copy_0,1_copy_2 and so on. Creating copies does not overwrite the 

The queries would be usually 600-1000 queries union together.

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