Qiang.Kang created HIVE-23685:

             Summary: Removing user's extra resources when executing File Merge 
                 Key: HIVE-23685
                 URL: https://issues.apache.org/jira/browse/HIVE-23685
             Project: Hive
          Issue Type: Bug
          Components: Physical Optimizer, Query Planning
            Reporter: Qiang.Kang
            Assignee: Qiang.Kang

Hi, we find that MapReduce's file merge map containers will download user's 
extra resources(such as: added jars, files, archives) before launching task. 
When these resources are large or the network is busy, file merge jobs will be 
timeout, causing the query be failed. As we all know, file merge task will run 
correctly just with hive-exec.jar and MapReduce framework. Therefore, there is 
no need to download user's resources. The patch below prevents setting 
`tmpjars` for FileMerge Task.

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