sercanCyberVision opened a new pull request, #4293:
URL: https://github.com/apache/hive/pull/4293

   ### What changes were proposed in this pull request?
   When `ClearDanglingScratchDir` service identifies the dangling sessions to 
clean HDFS FS, we will be cleaning files/dirs in 
`HiveConf.ConfVars.LOCALSCRATCHDIR` (local FS) as well.
   
   ### Why are the changes needed?
   When Hive session is killed, no chance for shutdown hook to clean-up tmp 
files. This causes accumulation of tmp files/dirs in local FS as below;
   ```
   > ll /tmp/user/97c4ef50-5e80-480e-a6f0-4f779050852b*
   drwx------ 2 user user 4096 Oct 29 10:09 97c4ef50-5e80-480e-a6f0-4f779050852b
   -rw------- 1 user user    0 Oct 29 10:09 
97c4ef50-5e80-480e-a6f0-4f779050852b10571819313894728966.pipeout
   -rw------- 1 user user    0 Oct 29 10:09 
97c4ef50-5e80-480e-a6f0-4f779050852b16013956055489853961.pipeout
   -rw------- 1 user user    0 Oct 29 10:09 
97c4ef50-5e80-480e-a6f0-4f779050852b4383913570068173450.pipeout
   -rw------- 1 user user    0 Oct 29 10:09 
97c4ef50-5e80-480e-a6f0-4f779050852b889740171428672108.pipeout 
   ```
   
   ### Does this PR introduce _any_ user-facing change?
   No. The same service will have additional functionality. 
   
   ### How was this patch tested?
   Unit test.
   


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