Java tutorial
/* * 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.nutch.indexer; import java.io.IOException; import org.apache.hadoop.mapreduce.JobContext; import org.apache.hadoop.mapreduce.OutputCommitter; import org.apache.hadoop.mapreduce.OutputFormat; import org.apache.hadoop.mapreduce.RecordWriter; import org.apache.hadoop.mapreduce.TaskAttemptContext; public class IndexerOutputFormat extends OutputFormat<String, NutchDocument> { @Override public RecordWriter<String, NutchDocument> getRecordWriter(TaskAttemptContext job) throws IOException, InterruptedException { // final IndexWriter[] writers = // NutchIndexWriterFactory.getNutchIndexWriters(job.getConfiguration()); final IndexWriters writers = new IndexWriters(job.getConfiguration()); // for (final IndexWriter writer : writers) { // writer.open(job); // } writers.open(job.getConfiguration()); return new RecordWriter<String, NutchDocument>() { @Override public void write(String key, NutchDocument doc) throws IOException { // TODO: Check Write Status for delete or write. writers.write(doc); } @Override public void close(TaskAttemptContext context) throws IOException, InterruptedException { writers.close(); } }; } @Override public void checkOutputSpecs(JobContext jobContext) throws IOException, InterruptedException { } @Override public OutputCommitter getOutputCommitter(TaskAttemptContext arg0) throws IOException, InterruptedException { // return an empty outputcommitter return new OutputCommitter() { @Override public void setupTask(TaskAttemptContext arg0) throws IOException { } @Override public void setupJob(JobContext arg0) throws IOException { } @Override public boolean needsTaskCommit(TaskAttemptContext arg0) throws IOException { return false; } @Override public void commitTask(TaskAttemptContext arg0) throws IOException { } @Override public void abortTask(TaskAttemptContext arg0) throws IOException { } }; } }