/**
* Copyright 2010 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 com.alibaba.wasp.coprocessor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.coprocessor.BaseEndpointCoprocessor;
import org.apache.hadoop.hbase.coprocessor.ColumnInterpreter;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter;
import org.apache.hadoop.hbase.ipc.ProtocolSignature;
import org.apache.hadoop.hbase.regionserver.InternalScanner;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
*
*/
public class WaspAggregateImplementation extends BaseEndpointCoprocessor implements
WaspAggregateProtocol {
protected static Log log = LogFactory.getLog(WaspAggregateImplementation.class);
@Override
public ProtocolSignature getProtocolSignature(
String protocol, long version, int clientMethodsHashCode)
throws IOException {
if (WaspAggregateProtocol.class.getName().equals(protocol)) {
return new ProtocolSignature(WaspAggregateProtocol.VERSION, null);
}
throw new IOException("Unknown protocol: " + protocol);
}
@Override
public <T, S> S getSum(ColumnInterpreter<T, S> ci, Scan scan, byte[] qualifier) throws IOException {
long sum = 0l;
S sumVal = null;
T temp;
InternalScanner scanner = ((RegionCoprocessorEnvironment) getEnvironment())
.getRegion().getScanner(scan);
byte[] colFamily = scan.getFamilies()[0];
List<KeyValue> results = new ArrayList<KeyValue>();
try {
boolean hasMoreRows = false;
do {
hasMoreRows = scanner.next(results);
log.info("results size is " + results.size());
for (KeyValue kv : results) {
if(!Bytes.equals(kv.getQualifier(), qualifier)) {
continue;
}
temp = ci.getValue(colFamily, qualifier, kv);
log.info("WaspAggregateImplementation log : qualifier="
+ Bytes.toString(qualifier) + " value is :" + Bytes.toStringBinary(kv.getValue()) + " sum is :" + sumVal
+ " temp is :" + temp + " row is :" + Bytes.toStringBinary(kv.getRow()));
if (temp != null)
sumVal = ci.add(sumVal, ci.castToReturnType(temp));
}
results.clear();
} while (hasMoreRows);
} finally {
scanner.close();
}
log.debug("Sum from this region is "
+ ((RegionCoprocessorEnvironment) getEnvironment()).getRegion()
.getRegionNameAsString() + ": " + sum);
return sumVal;
}
@Override
public <T, S> long getRowNum(ColumnInterpreter<T, S> ci, Scan scan)
throws IOException {
long counter = 0l;
List<KeyValue> results = new ArrayList<KeyValue>();
byte[] colFamily = scan.getFamilies()[0];
byte[] qualifier = scan.getFamilyMap().get(colFamily).pollFirst();
if (scan.getFilter() == null && qualifier == null)
scan.setFilter(new FirstKeyOnlyFilter());
InternalScanner scanner = ((RegionCoprocessorEnvironment) getEnvironment())
.getRegion().getScanner(scan);
try {
boolean hasMoreRows = false;
int j = 0;
do {
j++;
hasMoreRows = scanner.next(results);
log.info("results size is " + results.size());
int i = 1;
for (KeyValue result : results) {
log.info("j = " + j + "; i = " + i + "; column = " + Bytes.toString(result.getQualifier()) + "; value = "
+ Bytes.toStringBinary(result.getValue()) );
}
if (results.size() > 0) {
counter++;
}
results.clear();
} while (hasMoreRows);
} finally {
scanner.close();
}
log.info("Row counter from this region is "
+ ((RegionCoprocessorEnvironment) getEnvironment()).getRegion()
.getRegionNameAsString() + ": " + counter);
return counter;
}
}