| /** |
| * 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.mapred.join; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.util.HashSet; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.WritableUtils; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * This InputSplit contains a set of child InputSplits. Any InputSplit inserted |
| * into this collection must have a public default constructor. |
| * |
| * @deprecated Use |
| * {@link org.apache.hadoop.mapreduce.lib.join.CompositeInputSplit} instead |
| */ |
| @Deprecated |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class CompositeInputSplit implements InputSplit { |
| |
| private int fill = 0; |
| private long totsize = 0L; |
| private InputSplit[] splits; |
| |
| public CompositeInputSplit() { } |
| |
| public CompositeInputSplit(int capacity) { |
| splits = new InputSplit[capacity]; |
| } |
| |
| /** |
| * Add an InputSplit to this collection. |
| * @throws IOException If capacity was not specified during construction |
| * or if capacity has been reached. |
| */ |
| public void add(InputSplit s) throws IOException { |
| if (null == splits) { |
| throw new IOException("Uninitialized InputSplit"); |
| } |
| if (fill == splits.length) { |
| throw new IOException("Too many splits"); |
| } |
| splits[fill++] = s; |
| totsize += s.getLength(); |
| } |
| |
| /** |
| * Get ith child InputSplit. |
| */ |
| public InputSplit get(int i) { |
| return splits[i]; |
| } |
| |
| /** |
| * Return the aggregate length of all child InputSplits currently added. |
| */ |
| public long getLength() throws IOException { |
| return totsize; |
| } |
| |
| /** |
| * Get the length of ith child InputSplit. |
| */ |
| public long getLength(int i) throws IOException { |
| return splits[i].getLength(); |
| } |
| |
| /** |
| * Collect a set of hosts from all child InputSplits. |
| */ |
| public String[] getLocations() throws IOException { |
| HashSet<String> hosts = new HashSet<String>(); |
| for (InputSplit s : splits) { |
| String[] hints = s.getLocations(); |
| if (hints != null && hints.length > 0) { |
| for (String host : hints) { |
| hosts.add(host); |
| } |
| } |
| } |
| return hosts.toArray(new String[hosts.size()]); |
| } |
| |
| /** |
| * getLocations from ith InputSplit. |
| */ |
| public String[] getLocation(int i) throws IOException { |
| return splits[i].getLocations(); |
| } |
| |
| /** |
| * Write splits in the following format. |
| * {@code |
| * <count><class1><class2>...<classn><split1><split2>...<splitn> |
| * } |
| */ |
| public void write(DataOutput out) throws IOException { |
| WritableUtils.writeVInt(out, splits.length); |
| for (InputSplit s : splits) { |
| Text.writeString(out, s.getClass().getName()); |
| } |
| for (InputSplit s : splits) { |
| s.write(out); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * @throws IOException If the child InputSplit cannot be read, typically |
| * for faliing access checks. |
| */ |
| @SuppressWarnings("unchecked") // Generic array assignment |
| public void readFields(DataInput in) throws IOException { |
| int card = WritableUtils.readVInt(in); |
| if (splits == null || splits.length != card) { |
| splits = new InputSplit[card]; |
| } |
| Class<? extends InputSplit>[] cls = new Class[card]; |
| try { |
| for (int i = 0; i < card; ++i) { |
| cls[i] = |
| Class.forName(Text.readString(in)).asSubclass(InputSplit.class); |
| } |
| for (int i = 0; i < card; ++i) { |
| splits[i] = ReflectionUtils.newInstance(cls[i], null); |
| splits[i].readFields(in); |
| } |
| } catch (ClassNotFoundException e) { |
| throw (IOException)new IOException("Failed split init").initCause(e); |
| } |
| } |
| |
| } |