| /** |
| * 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.crunch.io.hbase; |
| |
| import com.google.common.collect.ImmutableSet; |
| import org.apache.crunch.Pair; |
| import org.apache.crunch.ReadableData; |
| import org.apache.crunch.SourceTarget; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.HBaseConfiguration; |
| import org.apache.hadoop.hbase.client.HTable; |
| import org.apache.hadoop.hbase.client.Result; |
| import org.apache.hadoop.hbase.client.Scan; |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.hadoop.mapreduce.TaskInputOutputContext; |
| import org.apache.hadoop.util.StringUtils; |
| |
| import java.io.IOException; |
| import java.util.Set; |
| |
| public class HBaseData implements ReadableData<Pair<ImmutableBytesWritable, Result>> { |
| |
| private final String table; |
| private final String scansAsString; |
| private transient SourceTarget parent; |
| |
| public HBaseData(String table, String scansAsString, SourceTarget<?> parent) { |
| this.table = table; |
| this.scansAsString = scansAsString; |
| this.parent = parent; |
| } |
| |
| @Override |
| public Set<SourceTarget<?>> getSourceTargets() { |
| if (parent != null) { |
| return ImmutableSet.<SourceTarget<?>>of(parent); |
| } else { |
| return ImmutableSet.of(); |
| } |
| } |
| |
| @Override |
| public void configure(Configuration conf) { |
| // No-op |
| } |
| |
| @Override |
| public Iterable<Pair<ImmutableBytesWritable, Result>> read( |
| TaskInputOutputContext<?, ?, ?, ?> ctxt) throws IOException { |
| Configuration hconf = HBaseConfiguration.create(ctxt.getConfiguration()); |
| HTable htable = new HTable(hconf, table); |
| |
| String[] scanStrings = StringUtils.getStrings(scansAsString); |
| Scan[] scans = new Scan[scanStrings.length]; |
| for(int i = 0; i < scanStrings.length; i++){ |
| scans[i] = HBaseSourceTarget.convertStringToScan(scanStrings[i]); |
| } |
| |
| return new HTableIterable(htable, scans); |
| } |
| } |