| /** |
| * |
| * 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.hadoop.hbase.mapred; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.fs.FileAlreadyExistsException; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.classification.InterfaceStability; |
| import org.apache.hadoop.hbase.client.BufferedMutator; |
| import org.apache.hadoop.hbase.client.Connection; |
| import org.apache.hadoop.hbase.client.ConnectionFactory; |
| import org.apache.hadoop.hbase.client.Put; |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.hadoop.mapred.FileOutputFormat; |
| import org.apache.hadoop.mapred.InvalidJobConfException; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.RecordWriter; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.util.Progressable; |
| |
| /** |
| * Convert Map/Reduce output and write it to an HBase table |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class TableOutputFormat extends FileOutputFormat<ImmutableBytesWritable, Put> { |
| |
| /** JobConf parameter that specifies the output table */ |
| public static final String OUTPUT_TABLE = "hbase.mapred.outputtable"; |
| |
| /** |
| * Convert Reduce output (key, value) to (HStoreKey, KeyedDataArrayWritable) |
| * and write to an HBase table. |
| */ |
| protected static class TableRecordWriter implements RecordWriter<ImmutableBytesWritable, Put> { |
| private BufferedMutator m_mutator; |
| private Connection conn; |
| |
| /** |
| * Instantiate a TableRecordWriter with a BufferedMutator for batch writing. |
| */ |
| public TableRecordWriter(JobConf job) throws IOException { |
| // expecting exactly one path |
| TableName tableName = TableName.valueOf(job.get(OUTPUT_TABLE)); |
| try { |
| this.conn = ConnectionFactory.createConnection(job); |
| this.m_mutator = conn.getBufferedMutator(tableName); |
| } finally { |
| if (this.m_mutator == null) { |
| conn.close(); |
| conn = null; |
| } |
| } |
| } |
| |
| public void close(Reporter reporter) throws IOException { |
| if (this.m_mutator != null) { |
| this.m_mutator.close(); |
| } |
| if (conn != null) { |
| this.conn.close(); |
| } |
| } |
| |
| public void write(ImmutableBytesWritable key, Put value) throws IOException { |
| m_mutator.mutate(new Put(value)); |
| } |
| } |
| |
| /** |
| * Creates a new record writer. |
| * |
| * Be aware that the baseline javadoc gives the impression that there is a single |
| * {@link RecordWriter} per job but in HBase, it is more natural if we give you a new |
| * RecordWriter per call of this method. You must close the returned RecordWriter when done. |
| * Failure to do so will drop writes. |
| * |
| * @param ignored Ignored filesystem |
| * @param job Current JobConf |
| * @param name Name of the job |
| * @param progress |
| * @return The newly created writer instance. |
| * @throws IOException When creating the writer fails. |
| */ |
| @Override |
| public RecordWriter getRecordWriter(FileSystem ignored, JobConf job, String name, |
| Progressable progress) |
| throws IOException { |
| // Clear write buffer on fail is true by default so no need to reset it. |
| return new TableRecordWriter(job); |
| } |
| |
| @Override |
| public void checkOutputSpecs(FileSystem ignored, JobConf job) |
| throws FileAlreadyExistsException, InvalidJobConfException, IOException { |
| String tableName = job.get(OUTPUT_TABLE); |
| if (tableName == null) { |
| throw new IOException("Must specify table name"); |
| } |
| } |
| } |