org.apache.hadoop.hbase.coprocessor

Class BaseRowProcessorEndpoint<S extends Message,T extends Message>

java.lang.Object

org.apache.hadoop.hbase.protobuf.generated.RowProcessorProtos.RowProcessorService

org.apache.hadoop.hbase.coprocessor.BaseRowProcessorEndpoint<S,T>

All Implemented Interfaces:

Service, Coprocessor, CoprocessorService

@InterfaceAudience.LimitedPrivate(value="Coprocesssor")
@InterfaceStability.Evolving
public abstract class BaseRowProcessorEndpoint<S extends Message,T extends Message>
extends RowProcessorProtos.RowProcessorService
implements CoprocessorService, Coprocessor

This class demonstrates how to implement atomic read-modify-writes using HRegion.processRowsWithLocks(org.apache.hadoop.hbase.regionserver.RowProcessor<?, ?>, long, long) and Coprocessor endpoints.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hbase.protobuf.generated.RowProcessorProtos.RowProcessorService

RowProcessorProtos.RowProcessorService.BlockingInterface, RowProcessorProtos.RowProcessorService.Interface, RowProcessorProtos.RowProcessorService.Stub

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.Coprocessor

Coprocessor.State

Field Summary

Fields inherited from interface org.apache.hadoop.hbase.Coprocessor

PRIORITY_HIGHEST, PRIORITY_LOWEST, PRIORITY_SYSTEM, PRIORITY_USER, VERSION

Constructor Summary

Constructors

Constructor and Description
BaseRowProcessorEndpoint()

Method Summary

Methods

Modifier and Type	Method and Description
Service	getService()
void	process(RpcController controller, RowProcessorProtos.ProcessRequest request, RpcCallback<RowProcessorProtos.ProcessResponse> done) Pass a processor to HRegion to process multiple rows atomically.
void	start(CoprocessorEnvironment env) Stores a reference to the coprocessor environment provided by the RegionCoprocessorHost from the region where this coprocessor is loaded.
void	stop(CoprocessorEnvironment env)

Methods inherited from class org.apache.hadoop.hbase.protobuf.generated.RowProcessorProtos.RowProcessorService

callMethod, getDescriptor, getDescriptorForType, getRequestPrototype, getResponsePrototype, newBlockingStub, newReflectiveBlockingService, newReflectiveService, newStub

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BaseRowProcessorEndpoint

public BaseRowProcessorEndpoint()

Method Detail

process

public void process(RpcController controller,
           RowProcessorProtos.ProcessRequest request,
           RpcCallback<RowProcessorProtos.ProcessResponse> done)

Pass a processor to HRegion to process multiple rows atomically. The RowProcessor implementations should be the inner classes of your RowProcessorEndpoint. This way the RowProcessor can be class-loaded with the Coprocessor endpoint together. See TestRowProcessorEndpoint for example. The request contains information for constructing processor (see constructRowProcessorFromRequest(org.apache.hadoop.hbase.protobuf.generated.RowProcessorProtos.ProcessRequest). The processor object defines the read-modify-write procedure.

Specified by:

process in class RowProcessorProtos.RowProcessorService

getService

public Service getService()

Specified by:

getService in interface CoprocessorService

start

public void start(CoprocessorEnvironment env)
           throws IOException

Stores a reference to the coprocessor environment provided by the RegionCoprocessorHost from the region where this coprocessor is loaded. Since this is a coprocessor endpoint, it always expects to be loaded on a table region, so always expects this to be an instance of RegionCoprocessorEnvironment.

Specified by:

start in interface Coprocessor

Parameters:

env - the environment provided by the coprocessor host

Throws:

IOException - if the provided environment is not an instance of RegionCoprocessorEnvironment

stop

public void stop(CoprocessorEnvironment env)
          throws IOException

Specified by:

stop in interface Coprocessor

Throws:

IOException