Hive does not always do a good job cleaning up after itself and will, many time leave lots of stuff in /tmp on HDFS.  Today I saw that I had 63T of data in /tmp/hive-* #humblebrag.  This script cleans up data older than N seconds, similar to 'find /tmp  -mmin +360 -exec rm {} \;'  Dump it in cron and you're good to go.