| /** |
| * |
| * 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.Path; |
| import org.apache.hadoop.hbase.HBaseConfiguration; |
| import org.apache.hadoop.hbase.client.HTable; |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.apache.hadoop.mapred.FileInputFormat; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.JobConfigurable; |
| import org.apache.hadoop.util.StringUtils; |
| |
| /** |
| * Convert HBase tabular data into a format that is consumable by Map/Reduce. |
| */ |
| @Deprecated |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class TableInputFormat extends TableInputFormatBase implements |
| JobConfigurable { |
| private final Log LOG = LogFactory.getLog(TableInputFormat.class); |
| |
| /** |
| * space delimited list of columns |
| */ |
| public static final String COLUMN_LIST = "hbase.mapred.tablecolumns"; |
| |
| public void configure(JobConf job) { |
| Path[] tableNames = FileInputFormat.getInputPaths(job); |
| String colArg = job.get(COLUMN_LIST); |
| String[] colNames = colArg.split(" "); |
| byte [][] m_cols = new byte[colNames.length][]; |
| for (int i = 0; i < m_cols.length; i++) { |
| m_cols[i] = Bytes.toBytes(colNames[i]); |
| } |
| setInputColumns(m_cols); |
| try { |
| setHTable(new HTable(HBaseConfiguration.create(job), tableNames[0].getName())); |
| } catch (Exception e) { |
| LOG.error(StringUtils.stringifyException(e)); |
| } |
| } |
| |
| public void validateInput(JobConf job) throws IOException { |
| // expecting exactly one path |
| Path [] tableNames = FileInputFormat.getInputPaths(job); |
| if (tableNames == null || tableNames.length > 1) { |
| throw new IOException("expecting one table name"); |
| } |
| |
| // connected to table? |
| if (getHTable() == null) { |
| throw new IOException("could not connect to table '" + |
| tableNames[0].getName() + "'"); |
| } |
| |
| // expecting at least one column |
| String colArg = job.get(COLUMN_LIST); |
| if (colArg == null || colArg.length() == 0) { |
| throw new IOException("expecting at least one column"); |
| } |
| } |
| } |