Major Description
Currently MiniMr is extremely slow, I ran udf_using.q on MiniMr and following are the execution time breakdown
Total time - 13m59s
Junit reported time for testcase - 50s
Most of the time is spent in creating/loading/analyzing initial tables - ~12m
Cleanup - ~1m
There is huge overhead for running MiniMr tests when compared to the actual test runtime.
Ran the same test without init script.
Total time - 2m17s
Junit reported time for testcase - 52s
Also I noticed some tests that doesn't have to run on MiniMr (like udf_using.q that does not require MiniMr. It just reads/write to hdfs which we can do in MiniTez/MiniLlap which are way faster). Most tests access only very few initial tables to read few rows from it. We can fix those tests to load just the table that is required for the table instead of all initial tables. Also we can remove q_init_script.sql initialization for MiniMr after rewriting and moving over the unwanted tests which should cut down the runtime a lot.