| Package | Description | 
|---|---|
| org.apache.giraph.bsp | Package of generic bulk synchronous processing objects. | 
| org.apache.giraph.master | Package of all the master related things. | 
| org.apache.giraph.worker | Package of all the worker related things | 
| Modifier and Type | Interface and Description | 
|---|---|
| interface  | CentralizedServiceMaster<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>At most, there will be one active master at a time, but many threads can
 be trying to be the active master. | 
| interface  | CentralizedServiceWorker<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>All workers should have access to this centralized service to
 execute the following methods. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | BspService<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>Zookeeper-based implementation of  CentralizedService. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | BspServiceMaster<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>ZooKeeper-based implementation of  CentralizedServiceMaster. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | BspServiceWorker<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>ZooKeeper-based implementation of  CentralizedServiceWorker. | 
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