| /** |
| * 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.sqoop.mapreduce.mainframe; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.LongWritable; |
| import org.apache.hadoop.mapreduce.InputFormat; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| import org.apache.sqoop.config.ConfigurationHelper; |
| import org.apache.sqoop.lib.SqoopRecord; |
| import org.apache.sqoop.util.MainframeFTPClientUtils; |
| |
| /** |
| * A InputFormat that retrieves a list of sequential dataset names in |
| * a mainframe partitioned dataset. It then creates splits containing one or |
| * more dataset names. |
| */ |
| public class MainframeDatasetInputFormat<T extends SqoopRecord> |
| extends InputFormat<LongWritable, T> { |
| |
| private static final Log LOG = |
| LogFactory.getLog(MainframeDatasetInputFormat.class); |
| |
| @Override |
| public RecordReader<LongWritable, T> createRecordReader( |
| InputSplit inputSplit, TaskAttemptContext taskAttemptContext) |
| throws IOException, InterruptedException { |
| return new MainframeDatasetFTPRecordReader<T>(); |
| } |
| |
| @Override |
| public List<InputSplit> getSplits(JobContext job) throws IOException { |
| List<InputSplit> splits = new ArrayList<InputSplit>(); |
| Configuration conf = job.getConfiguration(); |
| String dsName |
| = conf.get(MainframeConfiguration.MAINFRAME_INPUT_DATASET_NAME); |
| LOG.info("Datasets to transfer from: " + dsName); |
| String dsType = conf.get(MainframeConfiguration.MAINFRAME_INPUT_DATASET_TYPE); |
| LOG.info("Dataset type: " + dsType); |
| String dsTape = conf.get(MainframeConfiguration.MAINFRAME_INPUT_DATASET_TAPE); |
| LOG.info("Dataset on tape?: " + dsTape); |
| List<String> datasets = retrieveDatasets(dsName, conf); |
| if (datasets.isEmpty()) { |
| throw new IOException ("No datasets retrieved from " + dsName); |
| } else { |
| int count = datasets.size(); |
| int chunks = Math.min(count, ConfigurationHelper.getJobNumMaps(job)); |
| for (int i = 0; i < chunks; i++) { |
| splits.add(new MainframeDatasetInputSplit()); |
| } |
| |
| int j = 0; |
| while(j < count) { |
| for (InputSplit sp : splits) { |
| if (j == count) { |
| break; |
| } |
| ((MainframeDatasetInputSplit)sp).addDataset(datasets.get(j)); |
| j++; |
| } |
| } |
| } |
| return splits; |
| } |
| |
| protected List<String> retrieveDatasets(String dsName, Configuration conf) |
| throws IOException { |
| return MainframeFTPClientUtils.listSequentialDatasets(dsName, conf); |
| } |
| } |