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I had a strange experience while running a hive query (simple count of entries in an external table) along side a normal map reduce (word count program). My wordcount map reduce was started first, hive query started second. Hive query was some how fast and my first map reduce got stuck. Is there any case where Hive map reduce blocks all other map reduce running along side?
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I am assuming this is not consistently the case. Hive does not block any other jobs on the cluster. Cluster load and network latency can impact which job finishes first. If you are trying to compare two jobs to see which is the faster one, submit them at the same time and run the test at least 5-10 times and take the average times into consideration.