| /** |
| * 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.raid; |
| |
| import java.io.OutputStream; |
| import java.io.InputStream; |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.util.Progressable; |
| |
| public class XOREncoder extends Encoder { |
| public static final Log LOG = LogFactory.getLog( |
| "org.apache.hadoop.raid.XOREncoder"); |
| public XOREncoder( |
| Configuration conf, int stripeSize) { |
| super(conf, stripeSize, 1); |
| } |
| |
| @Override |
| protected void encodeStripe( |
| InputStream[] blocks, |
| long stripeStartOffset, |
| long blockSize, |
| OutputStream[] outs, |
| Progressable reporter) throws IOException { |
| LOG.info("Peforming XOR "); |
| ParityInputStream parityIn = |
| new ParityInputStream(blocks, blockSize, readBufs[0], writeBufs[0]); |
| try { |
| parityIn.drain(outs[0], reporter); |
| } finally { |
| parityIn.close(); |
| } |
| } |
| |
| @Override |
| public Path getParityTempPath() { |
| return new Path(RaidNode.unraidTmpDirectory(conf)); |
| } |
| } |