| /* |
| * 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.mapreduce; |
| |
| import java.io.IOException; |
| import java.util.Map.Entry; |
| |
| import org.apache.accumulo.core.client.ClientInfo; |
| import org.apache.accumulo.core.client.RowIterator; |
| 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.PeekingIterator; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapreduce.InputFormat; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.Job; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| /** |
| * This class allows MapReduce jobs to use Accumulo as the source of data. This {@link InputFormat} |
| * provides row names as {@link Text} as keys, and a corresponding {@link PeekingIterator} as a |
| * value, which in turn makes the {@link Key}/{@link Value} pairs for that row available to the Map |
| * function. |
| * |
| * The user must specify the following via static configurator methods: |
| * |
| * <ul> |
| * <li>{@link AccumuloRowInputFormat#setClientInfo(Job, ClientInfo)} |
| * <li>{@link AccumuloRowInputFormat#setInputTableName(Job, String)} |
| * <li>{@link AccumuloRowInputFormat#setScanAuthorizations(Job, Authorizations)} |
| * </ul> |
| * |
| * Other static methods are optional. |
| */ |
| public class AccumuloRowInputFormat |
| extends InputFormatBase<Text,PeekingIterator<Entry<Key,Value>>> { |
| @Override |
| public RecordReader<Text,PeekingIterator<Entry<Key,Value>>> createRecordReader(InputSplit split, |
| TaskAttemptContext context) throws IOException, InterruptedException { |
| log.setLevel(getLogLevel(context)); |
| return new RecordReaderBase<Text,PeekingIterator<Entry<Key,Value>>>() { |
| RowIterator rowIterator; |
| |
| @Override |
| public void initialize(InputSplit inSplit, TaskAttemptContext attempt) throws IOException { |
| super.initialize(inSplit, attempt); |
| rowIterator = new RowIterator(scannerIterator); |
| currentK = new Text(); |
| currentV = null; |
| } |
| |
| @Override |
| public boolean nextKeyValue() throws IOException, InterruptedException { |
| if (!rowIterator.hasNext()) |
| return false; |
| currentV = new PeekingIterator<>(rowIterator.next()); |
| numKeysRead = rowIterator.getKVCount(); |
| currentKey = currentV.peek().getKey(); |
| currentK = new Text(currentKey.getRow()); |
| return true; |
| } |
| }; |
| } |
| } |