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I seem to have thousands of empty pipeout files left behind under /tmp. They are all under /tmp/hive. What are they, do I need to worry about them?'

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hiveserver2 create operational logs which are added part of https://issues.apache.org/jira/browse/HIVE-4629 to report the progress of query like below.

"Parsing command", "Parse Completed", "Starting Semantic Analysis", "Semantic Analysis Completed", "Starting command"

these pipe file are created to write intermediate result into it to report the query progress,you need not to worry about them, if you want to disable them there is an option in hive to disable them by using

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