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  1. Abstract
  2. Supported Versions
  3. Performance Tuning and Sizing Guidelines for Informatica® Big Data Management 10.2.2

Performance Tuning and Sizing Guidelines for Informatica® Big Data Management 10.2.2

Performance Tuning and Sizing Guidelines for Informatica® Big Data Management 10.2.2

Aggregator Transformation

Aggregator Transformation

Disable map-side aggregation if a unique key is used as the group by key in an Aggregator transformation.
In the Blaze engine, map-side aggregation is analogous to the aggregation done in the map phase in a MapReduce job that runs on the Hive engine. Source data is aggregated based on the group-by port set in an Aggregator transformation. The aggregated data then moves to the data shuffle stage for the second level of aggregation.
If you specify a unique key as the group by port, disable the map-side aggregation in a mapping that runs on the Blaze engine.
In the Developer tool, set the following run-time property in the Run-time tab to disable map-side aggregation for the mapping:
Parameter
Value
GridExecutor.EnableMapSideAgg
False

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