Gopal V created HIVE-4318:
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Summary: OperatorHooks hit performance even when not used
Key: HIVE-4318
URL: https://issues.apache.org/jira/browse/HIVE-4318
Project: Hive
Issue Type: Bug
Components: Query Processor
Environment: Ubuntu LXC (64 bit)
Reporter: Gopal V
Operator Hooks inserted into Operator.java cause a performance hit even when it
is not being used.
For a count(1) query tested with & without the operator hook calls.
{code:title=with}
2013-04-09 07:33:58,920 Stage-1 map = 100%, reduce = 100%, Cumulative CPU
84.07 sec
Total MapReduce CPU Time Spent: 1 minutes 24 seconds 70 msec
OK
28800991
Time taken: 40.407 seconds, Fetched: 1 row(s)
{code}
{code:title=without}
2013-04-09 07:33:02,355 Stage-1 map = 100%, reduce = 100%, Cumulative CPU
68.48 sec
...
Total MapReduce CPU Time Spent: 1 minutes 8 seconds 480 msec
OK
28800991
Time taken: 35.907 seconds, Fetched: 1 row(s)
{code}
The effect is multiplied by the number of operators in the pipeline that has to
forward the row - the more operators there are the, the slower the query.
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