In the Tez mode of
execution of Informatica Mappings on HDP 2.6 cluster, I observed that the
property “mapreduce.job.maps” and “mapreduce.job.reduces” present
in the Configuration of a job run on Hive in Tez mode fetches the wrong values
as compared to the one in Mapreduce mode.
For a large set of data,
In
MR mode the values are,
mapreduce.job.maps: 3
mapreduce.job.reduces: 0
While
for Tez it is,
mapreduce.job.maps: 2
mapreduce.job.reduces: 6
But the DAG Graphical view shows that there are 3 mappers.


There is a discrepancy in the value of “mapreduce.job.reduces”
property in the Tez UI as well.

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We are unable to find an equivalent property in the Tez
configurations that is correctly populated with the number of mappers and
reducers.