Index: src/main/java/org/apache/hadoop/hbase/client/coprocessor/GroupByClient.java =================================================================== --- src/main/java/org/apache/hadoop/hbase/client/coprocessor/GroupByClient.java (revision 0) +++ src/main/java/org/apache/hadoop/hbase/client/coprocessor/GroupByClient.java (revision 0) @@ -0,0 +1,343 @@ +/** + * Copyright 2011 The Apache Software Foundation + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.hadoop.hbase.client.coprocessor; + +import java.io.IOException; +import java.util.List; +import java.util.Map; + +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.hbase.HConstants; +import org.apache.hadoop.hbase.client.HTable; +import org.apache.hadoop.hbase.client.Scan; +import org.apache.hadoop.hbase.coprocessor.ColumnInterpreter; +import org.apache.hadoop.hbase.coprocessor.GroupByProtocol; +import org.apache.hadoop.hbase.coprocessor.GroupByStatsValues; +import org.apache.hadoop.hbase.util.Bytes; + +/** + * This client class is for invoking the aggregate functions deployed on the + * Region Server side via the GroupByProtocol. This class will implement the + * supporting functionality for merging the individual results obtained from the + * GroupByProtocol for each region. + *

+ * This will serve as the client side handler for invoking the group by + * functions. + *