| /* |
| * 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.ignite.internal.processors.hadoop.impl.v2; |
| |
| import java.io.DataInput; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import org.apache.hadoop.mapreduce.InputFormat; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.JobContext; |
| import org.apache.hadoop.mapreduce.lib.input.FileSplit; |
| import org.apache.hadoop.util.ReflectionUtils; |
| import org.apache.ignite.IgniteCheckedException; |
| import org.apache.ignite.hadoop.HadoopInputSplit; |
| import org.apache.ignite.internal.IgniteInterruptedCheckedException; |
| import org.apache.ignite.internal.processors.hadoop.HadoopFileBlock; |
| import org.apache.ignite.internal.processors.hadoop.impl.HadoopUtils; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Hadoop API v2 splitter. |
| */ |
| public class HadoopV2Splitter { |
| /** */ |
| private static final String[] EMPTY_HOSTS = {}; |
| |
| /** |
| * @param ctx Job context. |
| * @return Collection of mapped splits. |
| * @throws IgniteCheckedException If mapping failed. |
| */ |
| public static Collection<HadoopInputSplit> splitJob(JobContext ctx) throws IgniteCheckedException { |
| try { |
| InputFormat<?, ?> format = ReflectionUtils.newInstance(ctx.getInputFormatClass(), ctx.getConfiguration()); |
| |
| assert format != null; |
| |
| List<InputSplit> splits = format.getSplits(ctx); |
| |
| Collection<HadoopInputSplit> res = new ArrayList<>(splits.size()); |
| |
| int id = 0; |
| |
| for (InputSplit nativeSplit : splits) { |
| if (nativeSplit instanceof FileSplit) { |
| FileSplit s = (FileSplit)nativeSplit; |
| |
| res.add(new HadoopFileBlock(s.getLocations(), s.getPath().toUri(), s.getStart(), s.getLength())); |
| } |
| else |
| res.add(HadoopUtils.wrapSplit(id, nativeSplit, nativeSplit.getLocations())); |
| |
| id++; |
| } |
| |
| return res; |
| } |
| catch (IOException | ClassNotFoundException e) { |
| throw new IgniteCheckedException(e); |
| } |
| catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| |
| throw new IgniteInterruptedCheckedException(e); |
| } |
| } |
| |
| /** |
| * @param clsName Input split class name. |
| * @param in Input stream. |
| * @param hosts Optional hosts. |
| * @return File block or {@code null} if it is not a {@link FileSplit} instance. |
| * @throws IgniteCheckedException If failed. |
| */ |
| public static HadoopFileBlock readFileBlock(String clsName, DataInput in, @Nullable String[] hosts) |
| throws IgniteCheckedException { |
| if (!FileSplit.class.getName().equals(clsName)) |
| return null; |
| |
| FileSplit split = new FileSplit(); |
| |
| try { |
| split.readFields(in); |
| } |
| catch (IOException e) { |
| throw new IgniteCheckedException(e); |
| } |
| |
| if (hosts == null) |
| hosts = EMPTY_HOSTS; |
| |
| return new HadoopFileBlock(hosts, split.getPath().toUri(), split.getStart(), split.getLength()); |
| } |
| } |