| /* |
| * 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.Entry; |
| |
| import org.apache.accumulo.core.client.ClientInfo; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.security.Authorizations; |
| import org.apache.accumulo.core.util.format.DefaultFormatter; |
| import org.apache.hadoop.mapred.InputFormat; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.log4j.Level; |
| |
| /** |
| * This class allows MapReduce jobs to use Accumulo as the source of data. This {@link 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#setInputTableName(JobConf, String)}</li> |
| * <li>{@link AccumuloInputFormat#setScanAuthorizations(JobConf, Authorizations)} |
| * </ul> |
| * |
| * Other static methods are optional. |
| */ |
| public class AccumuloInputFormat extends InputFormatBase<Key,Value> { |
| |
| @Override |
| public RecordReader<Key,Value> getRecordReader(InputSplit split, JobConf job, Reporter reporter) |
| throws IOException { |
| log.setLevel(getLogLevel(job)); |
| |
| // Override the log level from the configuration as if the RangeInputSplit has one it's the more |
| // correct one to use. |
| if (split instanceof org.apache.accumulo.core.client.mapreduce.RangeInputSplit) { |
| // @formatter:off |
| org.apache.accumulo.core.client.mapreduce.RangeInputSplit accSplit = |
| (org.apache.accumulo.core.client.mapreduce.RangeInputSplit) split; |
| // @formatter:on |
| Level level = accSplit.getLogLevel(); |
| if (null != level) { |
| log.setLevel(level); |
| } |
| } else { |
| throw new IllegalArgumentException("No RecordReader for " + split.getClass()); |
| } |
| |
| RecordReaderBase<Key,Value> recordReader = new RecordReaderBase<Key,Value>() { |
| |
| @Override |
| public boolean next(Key key, Value value) throws IOException { |
| if (scannerIterator.hasNext()) { |
| ++numKeysRead; |
| 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; |
| } |
| } |