| /** |
| * |
| * 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.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.hbase.classification.InterfaceStability; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.hbase.HBaseConfiguration; |
| import org.apache.hadoop.hbase.client.HTable; |
| import org.apache.hadoop.hbase.client.Put; |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.hadoop.fs.FileAlreadyExistsException; |
| import org.apache.hadoop.mapred.InvalidJobConfException; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.FileOutputFormat; |
| 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 |
| */ |
| @Deprecated |
| @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"; |
| private final Log LOG = LogFactory.getLog(TableOutputFormat.class); |
| |
| /** |
| * Convert Reduce output (key, value) to (HStoreKey, KeyedDataArrayWritable) |
| * and write to an HBase table |
| */ |
| protected static class TableRecordWriter |
| implements RecordWriter<ImmutableBytesWritable, Put> { |
| private HTable m_table; |
| |
| /** |
| * Instantiate a TableRecordWriter with the HBase HClient for writing. |
| * |
| * @param table |
| */ |
| public TableRecordWriter(HTable table) { |
| m_table = table; |
| } |
| |
| public void close(Reporter reporter) |
| throws IOException { |
| m_table.close(); |
| } |
| |
| public void write(ImmutableBytesWritable key, |
| Put value) throws IOException { |
| m_table.put(new Put(value)); |
| } |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public RecordWriter getRecordWriter(FileSystem ignored, |
| JobConf job, String name, Progressable progress) throws IOException { |
| |
| // expecting exactly one path |
| |
| String tableName = job.get(OUTPUT_TABLE); |
| HTable table = null; |
| try { |
| table = new HTable(HBaseConfiguration.create(job), tableName); |
| } catch(IOException e) { |
| LOG.error(e); |
| throw e; |
| } |
| table.setAutoFlush(false, true); |
| return new TableRecordWriter(table); |
| } |
| |
| @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"); |
| } |
| } |
| } |