| /* |
| * 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.accumulo.core.client.mapred; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| import org.apache.accumulo.core.client.ClientInfo; |
| import org.apache.accumulo.core.client.mapred.InputFormatBase.RecordReaderBase; |
| import org.apache.accumulo.core.client.mapreduce.InputTableConfig; |
| import org.apache.accumulo.core.client.mapreduce.lib.impl.InputConfigurator; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.util.format.DefaultFormatter; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.Reporter; |
| |
| /** |
| * This class allows MapReduce jobs to use multiple Accumulo tables as the source of data. This |
| * {@link org.apache.hadoop.mapred.InputFormat} provides keys and values of type {@link Key} and |
| * {@link Value} to the Map function. |
| * |
| * The user must specify the following via static configurator methods: |
| * |
| * <ul> |
| * <li>{@link AccumuloInputFormat#setClientInfo(JobConf, ClientInfo)} |
| * <li>{@link AccumuloInputFormat#setScanAuthorizations(JobConf, org.apache.accumulo.core.security.Authorizations)} |
| * <li>{@link AccumuloMultiTableInputFormat#setInputTableConfigs(org.apache.hadoop.mapred.JobConf, java.util.Map)} |
| * </ul> |
| * |
| * Other static methods are optional. |
| */ |
| |
| public class AccumuloMultiTableInputFormat extends AbstractInputFormat<Key,Value> { |
| |
| /** |
| * Sets the {@link InputTableConfig} objects on the given Hadoop configuration |
| * |
| * @param job |
| * the Hadoop job instance to be configured |
| * @param configs |
| * the table query configs to be set on the configuration. |
| * @since 1.6.0 |
| */ |
| public static void setInputTableConfigs(JobConf job, Map<String,InputTableConfig> configs) { |
| InputConfigurator.setInputTableConfigs(CLASS, job, configs); |
| } |
| |
| @Override |
| public RecordReader<Key,Value> getRecordReader(InputSplit split, JobConf job, Reporter reporter) |
| throws IOException { |
| log.setLevel(getLogLevel(job)); |
| RecordReaderBase<Key,Value> recordReader = new RecordReaderBase<Key,Value>() { |
| |
| @Override |
| public boolean next(Key key, Value value) throws IOException { |
| if (scannerIterator.hasNext()) { |
| ++numKeysRead; |
| Map.Entry<Key,Value> entry = scannerIterator.next(); |
| key.set(currentKey = entry.getKey()); |
| value.set(entry.getValue().get()); |
| if (log.isTraceEnabled()) |
| log.trace("Processing key/value pair: " + DefaultFormatter.formatEntry(entry, true)); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public Key createKey() { |
| return new Key(); |
| } |
| |
| @Override |
| public Value createValue() { |
| return new Value(); |
| } |
| |
| }; |
| recordReader.initialize(split, job); |
| return recordReader; |
| } |
| } |