hbase协处理器编码实例

Observer协处理器通常在一个特定的事件（诸如Get或Put）之前或之后发生，相当于RDBMS中的触发器。Endpoint协处理器则类似于RDBMS中的存储过程，因为它可以让你在RegionServer上对数据执行自定义计算，而不是在客户端上执行计算。

本文是以上两者的简单实例，使用的环境：环境 jdk1.8 hadoop2.6.5 hbase1.2.4。

1、Endpoint实例 
1> 编写适用于protobuf的proto文件，如下，尽量不要带注释，因为编译时可能出现乱码

option java_package = "com.endpoint.test";
option java_outer_classname = "Sum";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
option optimize_for = SPEED;

message SumRequest {
    required string family = 1;    
    required string column = 2;    
}
message SumResponse {
    required int64 sum = 1 [default = 0];
}
service SumService {
    rpc getSum(SumRequest)
        returns (SumResponse);
}

 2> 编译上面的proto文件
使用protoc程序进行编译，linux下或者windows均可，protoc程序可以直接从github下载:https://github.com/google/protobuf/releases，也可以自己编译生成，参见protobuf的编译安装

注意，编译的版本要与hadoop以及hbase使用的版本相同，或者略高，但最好不要过高，hadoop2.6.5 hbase1.2.4使用的都是protobuf2.5.0的版本，写此篇文章时的最新版为3.1.0

（高版本必须指定syntax，例如proto3的syntax在第一行非空白非注释行，必须写：syntax = "proto3"，字段规则移除了 “required”，并把 “optional” 改名为 “singular”,移除了 default 选项。可搜索Protobuf 的 proto3 与 proto2 的区别进行了解。）下载的话选择带win或linux的版本，这是编译好的版本。有很多带具体语言的版本，是一些具体某种语言的发行版源码包。为了与hbase以及hadoop统一起来，此处用的是protoc-2.5.0-win32.zip。

解压文件：

 

 使用windows命令行进入上面的目录，执行以下命令即可：

protoc.exe sum1.proto --java_out=./

高版本有编译好的适用于linux下的protoc程序文件，低版本没有。在linux下执行以下命令：

protoc sum.proto --java_out=./

 结果都一样，生成的代码参见折叠部分，有很多，因为上面文件中指定java_outer_classname = "Sum"，所以会生成Sum类，将这个类引入到项目中，注意项目的包名称与上面文件中指定（option java_package = "com.endpoint.test"）的名称要一致。

// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: sumcode.proto

package com.endpoint.test;

public final class Sum {
  private Sum() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistry registry) {
  }
  public interface SumRequestOrBuilder
      extends com.google.protobuf.MessageOrBuilder {

    // required string family = 1;
    /**
     * <code>required string family = 1;</code>
     */
    boolean hasFamily();
    /**
     * <code>required string family = 1;</code>
     */
    java.lang.String getFamily();
    /**
     * <code>required string family = 1;</code>
     */
    com.google.protobuf.ByteString
        getFamilyBytes();

    // required string column = 2;
    /**
     * <code>required string column = 2;</code>
     */
    boolean hasColumn();
    /**
     * <code>required string column = 2;</code>
     */
    java.lang.String getColumn();
    /**
     * <code>required string column = 2;</code>
     */
    com.google.protobuf.ByteString
        getColumnBytes();
  }
  /**
   * Protobuf type {@code SumRequest}
   */
  public static final class SumRequest extends
      com.google.protobuf.GeneratedMessage
      implements SumRequestOrBuilder {
    // Use SumRequest.newBuilder() to construct.
    private SumRequest(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
      super(builder);
      this.unknownFields = builder.getUnknownFields();
    }
    private SumRequest(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }

    private static final SumRequest defaultInstance;
    public static SumRequest getDefaultInstance() {
      return defaultInstance;
    }

    public SumRequest getDefaultInstanceForType() {
      return defaultInstance;
    }

    private final com.google.protobuf.UnknownFieldSet unknownFields;
    @java.lang.Override
    public final com.google.protobuf.UnknownFieldSet
        getUnknownFields() {
      return this.unknownFields;
    }
    private SumRequest(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      initFields();
      int mutable_bitField0_ = 0;
      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
          com.google.protobuf.UnknownFieldSet.newBuilder();
      try {
        boolean done = false;
        while (!done) {
          int tag = input.readTag();
          switch (tag) {
            case 0:
              done = true;
              break;
            default: {
              if (!parseUnknownField(input, unknownFields,
                                     extensionRegistry, tag)) {
                done = true;
              }
              break;
            }
            case 10: {
              bitField0_ |= 0x00000001;
              family_ = input.readBytes();
              break;
            }
            case 18: {
              bitField0_ |= 0x00000002;
              column_ = input.readBytes();
              break;
            }
          }
        }
      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(this);
      } catch (java.io.IOException e) {
        throw new com.google.protobuf.InvalidProtocolBufferException(
            e.getMessage()).setUnfinishedMessage(this);
      } finally {
        this.unknownFields = unknownFields.build();
        makeExtensionsImmutable();
      }
    }
    public static final com.google.protobuf.Descriptors.Descriptor
        getDescriptor() {
      return com.endpoint.test.Sum.internal_static_SumRequest_descriptor;
    }

    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
        internalGetFieldAccessorTable() {
      return com.endpoint.test.Sum.internal_static_SumRequest_fieldAccessorTable
          .ensureFieldAccessorsInitialized(
              com.endpoint.test.Sum.SumRequest.class, com.endpoint.test.Sum.SumRequest.Builder.class);
    }

    public static com.google.protobuf.Parser<SumRequest> PARSER =
        new com.google.protobuf.AbstractParser<SumRequest>() {
      public SumRequest parsePartialFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return new SumRequest(input, extensionRegistry);
      }
    };

    @java.lang.Override
    public com.google.protobuf.Parser<SumRequest> getParserForType() {
      return PARSER;
    }

    private int bitField0_;
    // required string family = 1;
    public static final int FAMILY_FIELD_NUMBER = 1;
    private java.lang.Object family_;
    /**
     * <code>required string family = 1;</code>
     */
    public boolean hasFamily() {
      return ((bitField0_ & 0x00000001) == 0x00000001);
    }
    /**
     * <code>required string family = 1;</code>
     */
    public java.lang.String getFamily() {
      java.lang.Object ref = family_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        if (bs.isValidUtf8()) {
          family_ = s;
        }
        return s;
      }
    }
    /**
     * <code>required string family = 1;</code>
     */
    public com.google.protobuf.ByteString
        getFamilyBytes() {
      java.lang.Object ref = family_;
      if (ref instanceof java.lang.String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        family_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }

    // required string column = 2;
    public static final int COLUMN_FIELD_NUMBER = 2;
    private java.lang.Object column_;
    /**
     * <code>required string column = 2;</code>
     */
    public boolean hasColumn() {
      return ((bitField0_ & 0x00000002) == 0x00000002);
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    /**
     * <code>required string column = 2;</code>
     */
    public java.lang.String getColumn() {
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      if (ref instanceof java.lang.String) {
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        com.google.protobuf.ByteString bs = 
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        java.lang.String s = bs.toStringUtf8();
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          column_ = s;
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    /**
     * <code>required string column = 2;</code>
     */
    public com.google.protobuf.ByteString
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      java.lang.Object ref = column_;
      if (ref instanceof java.lang.String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        column_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
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    private void initFields() {
      family_ = "";
      column_ = "";
    }
    private byte memoizedIsInitialized = -1;
    public final boolean isInitialized() {
      byte isInitialized = memoizedIsInitialized;
      if (isInitialized != -1) return isInitialized == 1;

      if (!hasFamily()) {
        memoizedIsInitialized = 0;
        return false;
      }
      if (!hasColumn()) {
        memoizedIsInitialized = 0;
        return false;
      }
      memoizedIsInitialized = 1;
      return true;
    }

    public void writeTo(com.google.protobuf.CodedOutputStream output)
                        throws java.io.IOException {
      getSerializedSize();
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        output.writeBytes(1, getFamilyBytes());
      }
      if (((bitField0_ & 0x00000002) == 0x00000002)) {
        output.writeBytes(2, getColumnBytes());
      }
      getUnknownFields().writeTo(output);
    }

    private int memoizedSerializedSize = -1;
    public int getSerializedSize() {
      int size = memoizedSerializedSize;
      if (size != -1) return size;

      size = 0;
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        size += com.google.protobuf.CodedOutputStream
          .computeBytesSize(1, getFamilyBytes());
      }
      if (((bitField0_ & 0x00000002) == 0x00000002)) {
        size += com.google.protobuf.CodedOutputStream
          .computeBytesSize(2, getColumnBytes());
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSerializedSize = size;
      return size;
    }

    private static final long serialVersionUID = 0L;
    @java.lang.Override
    protected java.lang.Object writeReplace()
        throws java.io.ObjectStreamException {
      return super.writeReplace();
    }

    @java.lang.Override
    public boolean equals(final java.lang.Object obj) {
      if (obj == this) {
       return true;
      }
      if (!(obj instanceof com.endpoint.test.Sum.SumRequest)) {
        return super.equals(obj);
      }
      com.endpoint.test.Sum.SumRequest other = (com.endpoint.test.Sum.SumRequest) obj;

      boolean result = true;
      result = result && (hasFamily() == other.hasFamily());
      if (hasFamily()) {
        result = result && getFamily()
            .equals(other.getFamily());
      }
      result = result && (hasColumn() == other.hasColumn());
      if (hasColumn()) {
        result = result && getColumn()
            .equals(other.getColumn());
      }
      result = result &&
          getUnknownFields().equals(other.getUnknownFields());
      return result;
    }

    private int memoizedHashCode = 0;
    @java.lang.Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptorForType().hashCode();
      if (hasFamily()) {
        hash = (37 * hash) + FAMILY_FIELD_NUMBER;
        hash = (53 * hash) + getFamily().hashCode();
      }
      if (hasColumn()) {
        hash = (37 * hash) + COLUMN_FIELD_NUMBER;
        hash = (53 * hash) + getColumn().hashCode();
      }
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }

    public static com.endpoint.test.Sum.SumRequest parseFrom(
        com.google.protobuf.ByteString data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static com.endpoint.test.Sum.SumRequest parseFrom(
        com.google.protobuf.ByteString data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumRequest parseFrom(byte[] data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static com.endpoint.test.Sum.SumRequest parseFrom(
        byte[] data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumRequest parseFrom(java.io.InputStream input)
        throws java.io.IOException {
      return PARSER.parseFrom(input);
    }
    public static com.endpoint.test.Sum.SumRequest parseFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return PARSER.parseFrom(input, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumRequest parseDelimitedFrom(java.io.InputStream input)
        throws java.io.IOException {
      return PARSER.parseDelimitedFrom(input);
    }
    public static com.endpoint.test.Sum.SumRequest parseDelimitedFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return PARSER.parseDelimitedFrom(input, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumRequest parseFrom(
        com.google.protobuf.CodedInputStream input)
        throws java.io.IOException {
      return PARSER.parseFrom(input);
    }
    public static com.endpoint.test.Sum.SumRequest parseFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return PARSER.parseFrom(input, extensionRegistry);
    }

    public static Builder newBuilder() { return Builder.create(); }
    public Builder newBuilderForType() { return newBuilder(); }
    public static Builder newBuilder(com.endpoint.test.Sum.SumRequest prototype) {
      return newBuilder().mergeFrom(prototype);
    }
    public Builder toBuilder() { return newBuilder(this); }

    @java.lang.Override
    protected Builder newBuilderForType(
        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
      Builder builder = new Builder(parent);
      return builder;
    }
    /**
     * Protobuf type {@code SumRequest}
     */
    public static final class Builder extends
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      public static final com.google.protobuf.Descriptors.Descriptor
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        return com.endpoint.test.Sum.internal_static_SumRequest_descriptor;
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      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
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      // Construct using com.endpoint.test.Sum.SumRequest.newBuilder()
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        maybeForceBuilderInitialization();
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      private Builder(
          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
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      private void maybeForceBuilderInitialization() {
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      private static Builder create() {
        return new Builder();
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      public Builder clear() {
        super.clear();
        family_ = "";
        bitField0_ = (bitField0_ & ~0x00000001);
        column_ = "";
        bitField0_ = (bitField0_ & ~0x00000002);
        return this;
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      public Builder clone() {
        return create().mergeFrom(buildPartial());
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      public com.google.protobuf.Descriptors.Descriptor
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        return com.endpoint.test.Sum.internal_static_SumRequest_descriptor;
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      public com.endpoint.test.Sum.SumRequest getDefaultInstanceForType() {
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          throw newUninitializedMessageException(result);
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      public com.endpoint.test.Sum.SumRequest buildPartial() {
        com.endpoint.test.Sum.SumRequest result = new com.endpoint.test.Sum.SumRequest(this);
        int from_bitField0_ = bitField0_;
        int to_bitField0_ = 0;
        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
          to_bitField0_ |= 0x00000001;
        }
        result.family_ = family_;
        if (((from_bitField0_ & 0x00000002) == 0x00000002)) {
          to_bitField0_ |= 0x00000002;
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        result.column_ = column_;
        result.bitField0_ = to_bitField0_;
        onBuilt();
        return result;
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      public Builder mergeFrom(com.google.protobuf.Message other) {
        if (other instanceof com.endpoint.test.Sum.SumRequest) {
          return mergeFrom((com.endpoint.test.Sum.SumRequest)other);
        } else {
          super.mergeFrom(other);
          return this;
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      }

      public Builder mergeFrom(com.endpoint.test.Sum.SumRequest other) {
        if (other == com.endpoint.test.Sum.SumRequest.getDefaultInstance()) return this;
        if (other.hasFamily()) {
          bitField0_ |= 0x00000001;
          family_ = other.family_;
          onChanged();
        }
        if (other.hasColumn()) {
          bitField0_ |= 0x00000002;
          column_ = other.column_;
          onChanged();
        }
        this.mergeUnknownFields(other.getUnknownFields());
        return this;
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      public final boolean isInitialized() {
        if (!hasFamily()) {
          
          return false;
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        if (!hasColumn()) {
          
          return false;
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      public Builder mergeFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
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      private int bitField0_;

      // required string family = 1;
      private java.lang.Object family_ = "";
      /**
       * <code>required string family = 1;</code>
       */
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        return ((bitField0_ & 0x00000001) == 0x00000001);
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      /**
       * <code>required string family = 1;</code>
       */
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        if (!(ref instanceof java.lang.String)) {
          java.lang.String s = ((com.google.protobuf.ByteString) ref)
              .toStringUtf8();
          family_ = s;
          return s;
        } else {
          return (java.lang.String) ref;
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      /**
       * <code>required string family = 1;</code>
       */
      public com.google.protobuf.ByteString
          getFamilyBytes() {
        java.lang.Object ref = family_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b = 
              com.google.protobuf.ByteString.copyFromUtf8(
                  (java.lang.String) ref);
          family_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
      /**
       * <code>required string family = 1;</code>
       */
      public Builder setFamily(
          java.lang.String value) {
        if (value == null) {
    throw new NullPointerException();
  }
  bitField0_ |= 0x00000001;
        family_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required string family = 1;</code>
       */
      public Builder clearFamily() {
        bitField0_ = (bitField0_ & ~0x00000001);
        family_ = getDefaultInstance().getFamily();
        onChanged();
        return this;
      }
      /**
       * <code>required string family = 1;</code>
       */
      public Builder setFamilyBytes(
          com.google.protobuf.ByteString value) {
        if (value == null) {
    throw new NullPointerException();
  }
  bitField0_ |= 0x00000001;
        family_ = value;
        onChanged();
        return this;
      }

      // required string column = 2;
      private java.lang.Object column_ = "";
      /**
       * <code>required string column = 2;</code>
       */
      public boolean hasColumn() {
        return ((bitField0_ & 0x00000002) == 0x00000002);
      }
      /**
       * <code>required string column = 2;</code>
       */
      public java.lang.String getColumn() {
        java.lang.Object ref = column_;
        if (!(ref instanceof java.lang.String)) {
          java.lang.String s = ((com.google.protobuf.ByteString) ref)
              .toStringUtf8();
          column_ = s;
          return s;
        } else {
          return (java.lang.String) ref;
        }
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      /**
       * <code>required string column = 2;</code>
       */
      public com.google.protobuf.ByteString
          getColumnBytes() {
        java.lang.Object ref = column_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b = 
              com.google.protobuf.ByteString.copyFromUtf8(
                  (java.lang.String) ref);
          column_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
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      /**
       * <code>required string column = 2;</code>
       */
      public Builder setColumn(
          java.lang.String value) {
        if (value == null) {
    throw new NullPointerException();
  }
  bitField0_ |= 0x00000002;
        column_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required string column = 2;</code>
       */
      public Builder clearColumn() {
        bitField0_ = (bitField0_ & ~0x00000002);
        column_ = getDefaultInstance().getColumn();
        onChanged();
        return this;
      }
      /**
       * <code>required string column = 2;</code>
       */
      public Builder setColumnBytes(
          com.google.protobuf.ByteString value) {
        if (value == null) {
    throw new NullPointerException();
  }
  bitField0_ |= 0x00000002;
        column_ = value;
        onChanged();
        return this;
      }

      // @@protoc_insertion_point(builder_scope:SumRequest)
    }

    static {
      defaultInstance = new SumRequest(true);
      defaultInstance.initFields();
    }

    // @@protoc_insertion_point(class_scope:SumRequest)
  }

  public interface SumResponseOrBuilder
      extends com.google.protobuf.MessageOrBuilder {

    // required int64 sum = 1 [default = 0];
    /**
     * <code>required int64 sum = 1 [default = 0];</code>
     */
    boolean hasSum();
    /**
     * <code>required int64 sum = 1 [default = 0];</code>
     */
    long getSum();
  }
  /**
   * Protobuf type {@code SumResponse}
   */
  public static final class SumResponse extends
      com.google.protobuf.GeneratedMessage
      implements SumResponseOrBuilder {
    // Use SumResponse.newBuilder() to construct.
    private SumResponse(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
      super(builder);
      this.unknownFields = builder.getUnknownFields();
    }
    private SumResponse(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }

    private static final SumResponse defaultInstance;
    public static SumResponse getDefaultInstance() {
      return defaultInstance;
    }

    public SumResponse getDefaultInstanceForType() {
      return defaultInstance;
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    private final com.google.protobuf.UnknownFieldSet unknownFields;
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    private SumResponse(
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        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
          com.google.protobuf.UnknownFieldSet.newBuilder();
      try {
        boolean done = false;
        while (!done) {
          int tag = input.readTag();
          switch (tag) {
            case 0:
              done = true;
              break;
            default: {
              if (!parseUnknownField(input, unknownFields,
                                     extensionRegistry, tag)) {
                done = true;
              }
              break;
            }
            case 8: {
              bitField0_ |= 0x00000001;
              sum_ = input.readInt64();
              break;
            }
          }
        }
      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(this);
      } catch (java.io.IOException e) {
        throw new com.google.protobuf.InvalidProtocolBufferException(
            e.getMessage()).setUnfinishedMessage(this);
      } finally {
        this.unknownFields = unknownFields.build();
        makeExtensionsImmutable();
      }
    }
    public static final com.google.protobuf.Descriptors.Descriptor
        getDescriptor() {
      return com.endpoint.test.Sum.internal_static_SumResponse_descriptor;
    }

    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
        internalGetFieldAccessorTable() {
      return com.endpoint.test.Sum.internal_static_SumResponse_fieldAccessorTable
          .ensureFieldAccessorsInitialized(
              com.endpoint.test.Sum.SumResponse.class, com.endpoint.test.Sum.SumResponse.Builder.class);
    }

    public static com.google.protobuf.Parser<SumResponse> PARSER =
        new com.google.protobuf.AbstractParser<SumResponse>() {
      public SumResponse parsePartialFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return new SumResponse(input, extensionRegistry);
      }
    };

    @java.lang.Override
    public com.google.protobuf.Parser<SumResponse> getParserForType() {
      return PARSER;
    }

    private int bitField0_;
    // required int64 sum = 1 [default = 0];
    public static final int SUM_FIELD_NUMBER = 1;
    private long sum_;
    /**
     * <code>required int64 sum = 1 [default = 0];</code>
     */
    public boolean hasSum() {
      return ((bitField0_ & 0x00000001) == 0x00000001);
    }
    /**
     * <code>required int64 sum = 1 [default = 0];</code>
     */
    public long getSum() {
      return sum_;
    }

    private void initFields() {
      sum_ = 0L;
    }
    private byte memoizedIsInitialized = -1;
    public final boolean isInitialized() {
      byte isInitialized = memoizedIsInitialized;
      if (isInitialized != -1) return isInitialized == 1;

      if (!hasSum()) {
        memoizedIsInitialized = 0;
        return false;
      }
      memoizedIsInitialized = 1;
      return true;
    }

    public void writeTo(com.google.protobuf.CodedOutputStream output)
                        throws java.io.IOException {
      getSerializedSize();
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        output.writeInt64(1, sum_);
      }
      getUnknownFields().writeTo(output);
    }

    private int memoizedSerializedSize = -1;
    public int getSerializedSize() {
      int size = memoizedSerializedSize;
      if (size != -1) return size;

      size = 0;
      if (((bitField0_ & 0x00000001) == 0x00000001)) {
        size += com.google.protobuf.CodedOutputStream
          .computeInt64Size(1, sum_);
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSerializedSize = size;
      return size;
    }

    private static final long serialVersionUID = 0L;
    @java.lang.Override
    protected java.lang.Object writeReplace()
        throws java.io.ObjectStreamException {
      return super.writeReplace();
    }

    @java.lang.Override
    public boolean equals(final java.lang.Object obj) {
      if (obj == this) {
       return true;
      }
      if (!(obj instanceof com.endpoint.test.Sum.SumResponse)) {
        return super.equals(obj);
      }
      com.endpoint.test.Sum.SumResponse other = (com.endpoint.test.Sum.SumResponse) obj;

      boolean result = true;
      result = result && (hasSum() == other.hasSum());
      if (hasSum()) {
        result = result && (getSum()
            == other.getSum());
      }
      result = result &&
          getUnknownFields().equals(other.getUnknownFields());
      return result;
    }

    private int memoizedHashCode = 0;
    @java.lang.Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptorForType().hashCode();
      if (hasSum()) {
        hash = (37 * hash) + SUM_FIELD_NUMBER;
        hash = (53 * hash) + hashLong(getSum());
      }
      hash = (29 * hash) + getUnknownFields().hashCode();
      memoizedHashCode = hash;
      return hash;
    }

    public static com.endpoint.test.Sum.SumResponse parseFrom(
        com.google.protobuf.ByteString data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static com.endpoint.test.Sum.SumResponse parseFrom(
        com.google.protobuf.ByteString data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumResponse parseFrom(byte[] data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static com.endpoint.test.Sum.SumResponse parseFrom(
        byte[] data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumResponse parseFrom(java.io.InputStream input)
        throws java.io.IOException {
      return PARSER.parseFrom(input);
    }
    public static com.endpoint.test.Sum.SumResponse parseFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return PARSER.parseFrom(input, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumResponse parseDelimitedFrom(java.io.InputStream input)
        throws java.io.IOException {
      return PARSER.parseDelimitedFrom(input);
    }
    public static com.endpoint.test.Sum.SumResponse parseDelimitedFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return PARSER.parseDelimitedFrom(input, extensionRegistry);
    }
    public static com.endpoint.test.Sum.SumResponse parseFrom(
        com.google.protobuf.CodedInputStream input)
        throws java.io.IOException {
      return PARSER.parseFrom(input);
    }
    public static com.endpoint.test.Sum.SumResponse parseFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return PARSER.parseFrom(input, extensionRegistry);
    }

    public static Builder newBuilder() { return Builder.create(); }
    public Builder newBuilderForType() { return newBuilder(); }
    public static Builder newBuilder(com.endpoint.test.Sum.SumResponse prototype) {
      return newBuilder().mergeFrom(prototype);
    }
    public Builder toBuilder() { return newBuilder(this); }

    @java.lang.Override
    protected Builder newBuilderForType(
        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
      Builder builder = new Builder(parent);
      return builder;
    }
    /**
     * Protobuf type {@code SumResponse}
     */
    public static final class Builder extends
        com.google.protobuf.GeneratedMessage.Builder<Builder>
       implements com.endpoint.test.Sum.SumResponseOrBuilder {
      public static final com.google.protobuf.Descriptors.Descriptor
          getDescriptor() {
        return com.endpoint.test.Sum.internal_static_SumResponse_descriptor;
      }

      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
          internalGetFieldAccessorTable() {
        return com.endpoint.test.Sum.internal_static_SumResponse_fieldAccessorTable
            .ensureFieldAccessorsInitialized(
                com.endpoint.test.Sum.SumResponse.class, com.endpoint.test.Sum.SumResponse.Builder.class);
      }

      // Construct using com.endpoint.test.Sum.SumResponse.newBuilder()
      private Builder() {
        maybeForceBuilderInitialization();
      }

      private Builder(
          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
        super(parent);
        maybeForceBuilderInitialization();
      }
      private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
        }
      }
      private static Builder create() {
        return new Builder();
      }

      public Builder clear() {
        super.clear();
        sum_ = 0L;
        bitField0_ = (bitField0_ & ~0x00000001);
        return this;
      }

      public Builder clone() {
        return create().mergeFrom(buildPartial());
      }

      public com.google.protobuf.Descriptors.Descriptor
          getDescriptorForType() {
        return com.endpoint.test.Sum.internal_static_SumResponse_descriptor;
      }

      public com.endpoint.test.Sum.SumResponse getDefaultInstanceForType() {
        return com.endpoint.test.Sum.SumResponse.getDefaultInstance();
      }

      public com.endpoint.test.Sum.SumResponse build() {
        com.endpoint.test.Sum.SumResponse result = buildPartial();
        if (!result.isInitialized()) {
          throw newUninitializedMessageException(result);
        }
        return result;
      }

      public com.endpoint.test.Sum.SumResponse buildPartial() {
        com.endpoint.test.Sum.SumResponse result = new com.endpoint.test.Sum.SumResponse(this);
        int from_bitField0_ = bitField0_;
        int to_bitField0_ = 0;
        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
          to_bitField0_ |= 0x00000001;
        }
        result.sum_ = sum_;
        result.bitField0_ = to_bitField0_;
        onBuilt();
        return result;
      }

      public Builder mergeFrom(com.google.protobuf.Message other) {
        if (other instanceof com.endpoint.test.Sum.SumResponse) {
          return mergeFrom((com.endpoint.test.Sum.SumResponse)other);
        } else {
          super.mergeFrom(other);
          return this;
        }
      }

      public Builder mergeFrom(com.endpoint.test.Sum.SumResponse other) {
        if (other == com.endpoint.test.Sum.SumResponse.getDefaultInstance()) return this;
        if (other.hasSum()) {
          setSum(other.getSum());
        }
        this.mergeUnknownFields(other.getUnknownFields());
        return this;
      }

      public final boolean isInitialized() {
        if (!hasSum()) {
          
          return false;
        }
        return true;
      }

      public Builder mergeFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        com.endpoint.test.Sum.SumResponse parsedMessage = null;
        try {
          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
          parsedMessage = (com.endpoint.test.Sum.SumResponse) e.getUnfinishedMessage();
          throw e;
        } finally {
          if (parsedMessage != null) {
            mergeFrom(parsedMessage);
          }
        }
        return this;
      }
      private int bitField0_;

      // required int64 sum = 1 [default = 0];
      private long sum_ ;
      /**
       * <code>required int64 sum = 1 [default = 0];</code>
       */
      public boolean hasSum() {
        return ((bitField0_ & 0x00000001) == 0x00000001);
      }
      /**
       * <code>required int64 sum = 1 [default = 0];</code>
       */
      public long getSum() {
        return sum_;
      }
      /**
       * <code>required int64 sum = 1 [default = 0];</code>
       */
      public Builder setSum(long value) {
        bitField0_ |= 0x00000001;
        sum_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required int64 sum = 1 [default = 0];</code>
       */
      public Builder clearSum() {
        bitField0_ = (bitField0_ & ~0x00000001);
        sum_ = 0L;
        onChanged();
        return this;
      }

      // @@protoc_insertion_point(builder_scope:SumResponse)
    }

    static {
      defaultInstance = new SumResponse(true);
      defaultInstance.initFields();
    }

    // @@protoc_insertion_point(class_scope:SumResponse)
  }

  /**
   * Protobuf service {@code SumService}
   */
  public static abstract class SumService
      implements com.google.protobuf.Service {
    protected SumService() {}

    public interface Interface {
      /**
       * <code>rpc getSum(.SumRequest) returns (.SumResponse);</code>
       */
      public abstract void getSum(
          com.google.protobuf.RpcController controller,
          com.endpoint.test.Sum.SumRequest request,
          com.google.protobuf.RpcCallback<com.endpoint.test.Sum.SumResponse> done);

    }

    public static com.google.protobuf.Service newReflectiveService(
        final Interface impl) {
      return new SumService() {
        @java.lang.Override
        public  void getSum(
            com.google.protobuf.RpcController controller,
            com.endpoint.test.Sum.SumRequest request,
            com.google.protobuf.RpcCallback<com.endpoint.test.Sum.SumResponse> done) {
          impl.getSum(controller, request, done);
        }

      };
    }

    public static com.google.protobuf.BlockingService
        newReflectiveBlockingService(final BlockingInterface impl) {
      return new com.google.protobuf.BlockingService() {
        public final com.google.protobuf.Descriptors.ServiceDescriptor
            getDescriptorForType() {
          return getDescriptor();
        }

        public final com.google.protobuf.Message callBlockingMethod(
            com.google.protobuf.Descriptors.MethodDescriptor method,
            com.google.protobuf.RpcController controller,
            com.google.protobuf.Message request)
            throws com.google.protobuf.ServiceException {
          if (method.getService() != getDescriptor()) {
            throw new java.lang.IllegalArgumentException(
              "Service.callBlockingMethod() given method descriptor for " +
              "wrong service type.");
          }
          switch(method.getIndex()) {
            case 0:
              return impl.getSum(controller, (com.endpoint.test.Sum.SumRequest)request);
            default:
              throw new java.lang.AssertionError("Can't get here.");
          }
        }

        public final com.google.protobuf.Message
            getRequestPrototype(
            com.google.protobuf.Descriptors.MethodDescriptor method) {
          if (method.getService() != getDescriptor()) {
            throw new java.lang.IllegalArgumentException(
              "Service.getRequestPrototype() given method " +
              "descriptor for wrong service type.");
          }
          switch(method.getIndex()) {
            case 0:
              return com.endpoint.test.Sum.SumRequest.getDefaultInstance();
            default:
              throw new java.lang.AssertionError("Can't get here.");
          }
        }

        public final com.google.protobuf.Message
            getResponsePrototype(
            com.google.protobuf.Descriptors.MethodDescriptor method) {
          if (method.getService() != getDescriptor()) {
            throw new java.lang.IllegalArgumentException(
              "Service.getResponsePrototype() given method " +
              "descriptor for wrong service type.");
          }
          switch(method.getIndex()) {
            case 0:
              return com.endpoint.test.Sum.SumResponse.getDefaultInstance();
            default:
              throw new java.lang.AssertionError("Can't get here.");
          }
        }

      };
    }

    /**
     * <code>rpc getSum(.SumRequest) returns (.SumResponse);</code>
     */
    public abstract void getSum(
        com.google.protobuf.RpcController controller,
        com.endpoint.test.Sum.SumRequest request,
        com.google.protobuf.RpcCallback<com.endpoint.test.Sum.SumResponse> done);

    public static final
        com.google.protobuf.Descriptors.ServiceDescriptor
        getDescriptor() {
      return com.endpoint.test.Sum.getDescriptor().getServices().get(0);
    }
    public final com.google.protobuf.Descriptors.ServiceDescriptor
        getDescriptorForType() {
      return getDescriptor();
    }

    public final void callMethod(
        com.google.protobuf.Descriptors.MethodDescriptor method,
        com.google.protobuf.RpcController controller,
        com.google.protobuf.Message request,
        com.google.protobuf.RpcCallback<
          com.google.protobuf.Message> done) {
      if (method.getService() != getDescriptor()) {
        throw new java.lang.IllegalArgumentException(
          "Service.callMethod() given method descriptor for wrong " +
          "service type.");
      }
      switch(method.getIndex()) {
        case 0:
          this.getSum(controller, (com.endpoint.test.Sum.SumRequest)request,
            com.google.protobuf.RpcUtil.<com.endpoint.test.Sum.SumResponse>specializeCallback(
              done));
          return;
        default:
          throw new java.lang.AssertionError("Can't get here.");
      }
    }

    public final com.google.protobuf.Message
        getRequestPrototype(
        com.google.protobuf.Descriptors.MethodDescriptor method) {
      if (method.getService() != getDescriptor()) {
        throw new java.lang.IllegalArgumentException(
          "Service.getRequestPrototype() given method " +
          "descriptor for wrong service type.");
      }
      switch(method.getIndex()) {
        case 0:
          return com.endpoint.test.Sum.SumRequest.getDefaultInstance();
        default:
          throw new java.lang.AssertionError("Can't get here.");
      }
    }

    public final com.google.protobuf.Message
        getResponsePrototype(
        com.google.protobuf.Descriptors.MethodDescriptor method) {
      if (method.getService() != getDescriptor()) {
        throw new java.lang.IllegalArgumentException(
          "Service.getResponsePrototype() given method " +
          "descriptor for wrong service type.");
      }
      switch(method.getIndex()) {
        case 0:
          return com.endpoint.test.Sum.SumResponse.getDefaultInstance();
        default:
          throw new java.lang.AssertionError("Can't get here.");
      }
    }

    public static Stub newStub(
        com.google.protobuf.RpcChannel channel) {
      return new Stub(channel);
    }

    public static final class Stub extends com.endpoint.test.Sum.SumService implements Interface {
      private Stub(com.google.protobuf.RpcChannel channel) {
        this.channel = channel;
      }

      private final com.google.protobuf.RpcChannel channel;

      public com.google.protobuf.RpcChannel getChannel() {
        return channel;
      }

      public  void getSum(
          com.google.protobuf.RpcController controller,
          com.endpoint.test.Sum.SumRequest request,
          com.google.protobuf.RpcCallback<com.endpoint.test.Sum.SumResponse> done) {
        channel.callMethod(
          getDescriptor().getMethods().get(0),
          controller,
          request,
          com.endpoint.test.Sum.SumResponse.getDefaultInstance(),
          com.google.protobuf.RpcUtil.generalizeCallback(
            done,
            com.endpoint.test.Sum.SumResponse.class,
            com.endpoint.test.Sum.SumResponse.getDefaultInstance()));
      }
    }

    public static BlockingInterface newBlockingStub(
        com.google.protobuf.BlockingRpcChannel channel) {
      return new BlockingStub(channel);
    }

    public interface BlockingInterface {
      public com.endpoint.test.Sum.SumResponse getSum(
          com.google.protobuf.RpcController controller,
          com.endpoint.test.Sum.SumRequest request)
          throws com.google.protobuf.ServiceException;
    }

    private static final class BlockingStub implements BlockingInterface {
      private BlockingStub(com.google.protobuf.BlockingRpcChannel channel) {
        this.channel = channel;
      }

      private final com.google.protobuf.BlockingRpcChannel channel;

      public com.endpoint.test.Sum.SumResponse getSum(
          com.google.protobuf.RpcController controller,
          com.endpoint.test.Sum.SumRequest request)
          throws com.google.protobuf.ServiceException {
        return (com.endpoint.test.Sum.SumResponse) channel.callBlockingMethod(
          getDescriptor().getMethods().get(0),
          controller,
          request,
          com.endpoint.test.Sum.SumResponse.getDefaultInstance());
      }

    }

    // @@protoc_insertion_point(class_scope:SumService)
  }

  private static com.google.protobuf.Descriptors.Descriptor
    internal_static_SumRequest_descriptor;
  private static
    com.google.protobuf.GeneratedMessage.FieldAccessorTable
      internal_static_SumRequest_fieldAccessorTable;
  private static com.google.protobuf.Descriptors.Descriptor
    internal_static_SumResponse_descriptor;
  private static
    com.google.protobuf.GeneratedMessage.FieldAccessorTable
      internal_static_SumResponse_fieldAccessorTable;

  public static com.google.protobuf.Descriptors.FileDescriptor
      getDescriptor() {
    return descriptor;
  }
  private static com.google.protobuf.Descriptors.FileDescriptor
      descriptor;
  static {
    java.lang.String[] descriptorData = {
      "

sumcode.proto",

SumRequest2216
06family30" +
      "01 02(	2216
06column3002 02(	"35
13SumResponse2216
03" +
      "sum3001 02(03:01021

SumService22#
06getSum2213.S" +
      "umRequest3214.SumResponseB 
21com.endpoint." +
      "testB03SumH0121001012400101"
    };
    com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
      new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
        public com.google.protobuf.ExtensionRegistry assignDescriptors(
            com.google.protobuf.Descriptors.FileDescriptor root) {
          descriptor = root;
          internal_static_SumRequest_descriptor =
            getDescriptor().getMessageTypes().get(0);
          internal_static_SumRequest_fieldAccessorTable = new
            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
              internal_static_SumRequest_descriptor,
              new java.lang.String[] { "Family", "Column", });
          internal_static_SumResponse_descriptor =
            getDescriptor().getMessageTypes().get(1);
          internal_static_SumResponse_fieldAccessorTable = new
            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
              internal_static_SumResponse_descriptor,
              new java.lang.String[] { "Sum", });
          return null;
        }
      };
    com.google.protobuf.Descriptors.FileDescriptor
      .internalBuildGeneratedFileFrom(descriptorData,
        new com.google.protobuf.Descriptors.FileDescriptor[] {
        }, assigner);
  }

  // @@protoc_insertion_point(outer_class_scope)
}

 2> 编写服务器端的代码

package com.endpoint.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.Coprocessor;
import org.apache.hadoop.hbase.CoprocessorEnvironment;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.coprocessor.CoprocessorException;
import org.apache.hadoop.hbase.coprocessor.CoprocessorService;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.protobuf.ResponseConverter;
import org.apache.hadoop.hbase.regionserver.InternalScanner;
import org.apache.hadoop.hbase.util.Bytes;
import com.endpoint.test.Sum.SumRequest;
import com.endpoint.test.Sum.SumResponse;
import com.endpoint.test.Sum.SumService;
import com.google.protobuf.RpcCallback;
import com.google.protobuf.RpcController;
import com.google.protobuf.Service;

public class SumEndPoint extends SumService implements Coprocessor,CoprocessorService{

    private RegionCoprocessorEnvironment env;   // 定义环境  
    @Override
    public Service getService() {
        
        return this;
    }

    @Override
    public void start(CoprocessorEnvironment env) throws IOException {
         if (env instanceof RegionCoprocessorEnvironment) {  
                this.env = (RegionCoprocessorEnvironment)env;  
            } else {  
                throw new CoprocessorException("no load region");  
            }  
        
    }

    @Override
    public void stop(CoprocessorEnvironment env) throws IOException {
                
    }

    @Override
    public void getSum(RpcController controller, SumRequest request, RpcCallback<SumResponse> done) {
        
        // 设置扫描对象  
        Scan scan = new Scan();  
        scan.addFamily(Bytes.toBytes(request.getFamily()));  
        scan.addColumn(Bytes.toBytes(request.getFamily()), Bytes.toBytes(request.getColumn()));  
        
        // 定义变量  
        SumResponse response = null;  
        InternalScanner scanner = null;  
        
        // 扫描每个region，取值后求和  
        try {  
            scanner = env.getRegion().getScanner(scan);  
            List<Cell> results = new ArrayList<Cell>();  
            boolean hasMore = false;  
            Long sum = 0L;  
            do {  
                hasMore = scanner.next(results);  
                for (Cell cell : results) {  
                    sum += Long.parseLong(new String(CellUtil.cloneValue(cell)));  
                }  
                results.clear();  
            } while (hasMore);  
            // 设置返回结果  
            response = SumResponse.newBuilder().setSum(sum).build();  
        } catch (IOException e) {  
            ResponseConverter.setControllerException(controller, e);  
        } finally {  
            if (scanner != null) {  
                try {  
                    scanner.close();  
                } catch (IOException e) {  
                    //e.printStackTrace();  
                }  
            }  
        }  
        // 将rpc结果返回给客户端  
        done.run(response);  
        
    }

}

 3> 客户端测试代码

package com.endpoint.test;

import java.io.IOException;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.coprocessor.Batch;
import org.apache.hadoop.hbase.ipc.BlockingRpcCallback;
import com.endpoint.test.Sum.SumRequest;
import com.endpoint.test.Sum.SumResponse;
import com.endpoint.test.Sum.SumService;
import com.google.protobuf.ServiceException;

public class TestClient {

    public static void main(String[] args) throws Exception {
          
            // 配置HBse  
            Configuration conf = HBaseConfiguration.create();  
            conf.set("hbase.zookeeper.quorum", "master,data1,data2");  
            conf.set("hbase.zookeeper.property.clientPort", "2181");  
            conf.setLong("hbase.rpc.timeout", 600000);
            System.setProperty("hadoop.home.dir", "C:/hadoopfiles/hadoop-common-2.2.0-bin-master");

            // 建立一个数据库的连接  
            Connection conn = ConnectionFactory.createConnection(conf);  
            // 获取表  
            HTable table = (HTable) conn.getTable(TableName.valueOf("etable"));  
            
            long sum = 0L;                
            
            // 设置请求对象  
            final SumRequest request = SumRequest.newBuilder().setFamily("cf").setColumn("value").build();  
            
            try {
                // 获得返回值  
                Map<byte[], Long> result = table.coprocessorService(SumService.class, null, null,   
                        new Batch.Call<SumService, Long>() {  
          
                            @Override  
                            public Long call(SumService service) throws IOException {  
                                BlockingRpcCallback<SumResponse> rpcCallback = new BlockingRpcCallback<SumResponse>();  
                                service.getSum(null, request, rpcCallback);  
                                SumResponse response = (SumResponse) rpcCallback.get();  
                                return response.hasSum() ? response.getSum() : 0L;
                            }  
                });  
                // 将返回值进行迭代相加  
                for (Long v : result.values()) {  
                    sum += v;  
                }  
                // 结果输出  
                System.out.println("sum: " + sum);                        
                
            } catch (ServiceException e) {
                e.printStackTrace(); 
            }catch (Throwable e) {
                e.printStackTrace(); 
            }
            table.close();  
            conn.close();  

    }

}

System.setProperty("hadoop.home.dir", "C:/hadoopfiles/hadoop-common-2.2.0-bin-master"); 这句代码是防错误用的，不具有实际意义，在hadoop-common-2.2.0-bin-master下建立bin目录放一个winutils.exe文件即可，否则会出现提示“Could not locate executable nullinwinutils.exe in the Hadoop binaries”

此外，需要在windows下设置一下hosts文件，因为conf.set("hbase.zookeeper.quorum", "master,data1,data2");

4> 使用Endpoint协处理器

将上面的Sum类文件与用于服务端的SumEndPoint 类文件打包上传到服务器

chown hadoop:hadoop datacode.jar 
chmod g+w  datacode.jar 

先改一下权限，之后

hadoop fs -copyFromLocal sumtest.jar /input/

 下面是要使用协处理器的hbase表

 要将协处理器加载到这个表上

disable 'etable'
# 包名.类名|权重 com.endpoint.test.SumEndPoint|100
alter'etable',METHOD =>'table_att','coprocessor' =>'/input/sumcode.jar|com.endpoint.test.SumEndPoint|100'
enable 'etable'

包名.类名|权重 com.endpoint.test.SumEndPoint|100

# 这样也是可以的，但是在集群变换主节点的情况下，不是很好
# alter'etable',METHOD =>'table_att','coprocessor' =>'hdfs://192.168.1.215:9000/input/sumcode.jar|com.endpoint.test.SumEndPoint|100'

此外，值得注意的一点，在集群中，最好在hbase-site.xml中设置以下属性：

<property>  
        <name>hbase.coprocessor.abortonerror</name>  
        <value>false</value>  
</property> 

设置为false目的在于提高容错性，如果这个属性没有设置为false，则在上传的jar包存在错误的情况下，会导致表不能enable或disable，从而导致集群中的这张表无法使用，甚至会影响到其他表。

 

 在windows中的客户端运行客户端的代码，结果如下：

 2、Observer实例
这个是一个二级索引实例，即假定在initialtable表中的数据格式是这样的

row1    E   151
row2    Y   158

在向initialtable表中写入数据时，自动将以下数据写入indextable表作为二级索引，indextable第二列成为indextable的键

Y    158

 1> 编写服务端代码

package com.observer.test;

import java.io.IOException;
import java.util.List;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Durability;
import org.apache.hadoop.hbase.client.HTableInterface;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.coprocessor.BaseRegionObserver;
import org.apache.hadoop.hbase.coprocessor.ObserverContext;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
import org.apache.hadoop.hbase.util.Bytes;

public class TestObserver extends BaseRegionObserver {
    @Override
    public void postPut(ObserverContext<RegionCoprocessorEnvironment> e, Put put, WALEdit edit, Durability durability)
            throws IOException {
        // indextable作为二级索引表  
        HTableInterface table = e.getEnvironment().getTable(TableName.valueOf("indextable"));  
        // 获取值  
        List<Cell> cellList1 = put.get(Bytes.toBytes("cf"), Bytes.toBytes("name"));  
        List<Cell> cellList2 = put.get(Bytes.toBytes("cf"), Bytes.toBytes("value"));  
        // 写入数据
        for (Cell cell1 : cellList1) {  
            // 原表的列cf:name的值作为indextable的rowkey，添加行  
            Put indexPut = new Put(CellUtil.cloneValue(cell1));  
            for (Cell cell2 : cellList2) {  
                // 原表的列cf:value的值作为indextable表中列cf:value的值 。
                indexPut.add(Bytes.toBytes("cf"), Bytes.toBytes("value"), CellUtil.cloneValue(cell2));  
            }  
          
            table.put(indexPut);  
        }  
        
        table.close();  
    }

}

 2> 编写客户段代码

package com.observer.test;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.util.Bytes;

public class DataClient {

    public static void main(String[] args) throws IOException {
        //配置 
        Configuration conf = HBaseConfiguration.create();  
        conf.set("hbase.zookeeper.quorum", "master,data1,data2");  
        conf.set("hbase.zookeeper.property.clientPort", "2181");  
        //连接  
        Connection conn = ConnectionFactory.createConnection(conf);        
        HTable table = (HTable) conn.getTable(TableName.valueOf("initialtable"));  
        // 写入数据  
        Put put = new Put(Bytes.toBytes("row01"));  
        put.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("name"), Bytes.toBytes("E"));  
        put.addColumn(Bytes.toBytes("cf"), Bytes.toBytes("value"), Bytes.toBytes("151"));  
        table.put(put);  
        // 关闭资源  
        table.close();  
        conn.close();  

    }

}

 3> 创建需要的表

 

 4> 加载协处理器
将服务端代码打包上传集群服务器的hdfs上

chown hadoop:hadoop datacode.jar 
chmod g+w  datacode.jar 
hadoop dfs -put datacode.jar /input/

之后，将协处理器加载到初始表中

disable 'initialtable'
alter'initialtable',METHOD =>'table_att','coprocessor' =>'/input/datacode.jar|com.observer.test.TestObserver|100'
enable 'initialtable'

5> 执行客户端代码，显示结果