| Package | Description | 
|---|---|
| org.apache.giraph.benchmark | Package of benchmarks for performance testing and optimization | 
| org.apache.giraph.comm.aggregators | Package for classes which are used to handle aggregators. | 
| org.apache.giraph.master | Package of all the master related things. | 
| org.apache.giraph.reducers | Package of Giraph reducers. | 
| org.apache.giraph.reducers.impl | Package of Giraph reducers. | 
| Class and Description | 
|---|
| ReduceOperation Reduce operations defining how to reduce single values
 passed on workers, into partial values on workers, and then
 into a single global reduced value. | 
| ReduceSameTypeOperation ReduceOperation object when single object being reduced is of
 same type as reduced value. | 
| Class and Description | 
|---|
| ReduceOperation Reduce operations defining how to reduce single values
 passed on workers, into partial values on workers, and then
 into a single global reduced value. | 
| Reducer Object responsible for performing reducing operation. | 
| Class and Description | 
|---|
| ReduceOperation Reduce operations defining how to reduce single values
 passed on workers, into partial values on workers, and then
 into a single global reduced value. | 
| ReduceSameTypeOperation ReduceOperation object when single object being reduced is of
 same type as reduced value. | 
| Class and Description | 
|---|
| ReduceOperation Reduce operations defining how to reduce single values
 passed on workers, into partial values on workers, and then
 into a single global reduced value. | 
| Class and Description | 
|---|
| ReduceOperation Reduce operations defining how to reduce single values
 passed on workers, into partial values on workers, and then
 into a single global reduced value. | 
| ReduceSameTypeOperation ReduceOperation object when single object being reduced is of
 same type as reduced value. | 
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