org.apache.hadoop.raid.JRSOEncoder.java Source code

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Here is the source code for org.apache.hadoop.raid.JRSOEncoder.java

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/**
 * 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.InputStream;
import java.io.OutputStream;
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;
import java.nio.ByteBuffer;

public class JRSOEncoder extends Encoder {

    native void jrsoEncode(ByteBuffer message, ByteBuffer parity, int k, int m, int bufferSize, ByteBuffer r);

    int seq;

    static {
        System.loadLibrary("jrsoencoder");
    }

    public static final Log LOG = LogFactory.getLog("org.apache.hadoop.raid.JRSOEncoder");

    private final ByteBuffer reserve;
    private ByteBuffer dataBufs;
    private ByteBuffer parityBufs;

    public JRSOEncoder(Configuration conf, int stripeSize, int paritySize) {
        super(conf, stripeSize, paritySize);
        bufSize = 64 * 1024;
        dataBufs = ByteBuffer.allocateDirect(bufSize * stripeSize);
        parityBufs = ByteBuffer.allocateDirect(bufSize * paritySize);
        reserve = ByteBuffer.allocateDirect(1024);
    }

    protected void encodeStripe(InputStream[] blocks, long stripeStartOffset, long blockSize, OutputStream[] outs,
            Progressable reporter) throws IOException {

        int[] data = new int[stripeSize];
        int[] code = new int[paritySize];

        seq = 0;

        for (long encoded = 0; encoded < blockSize; encoded += bufSize) {
            // Read some data from each block = bufSize.
            LOG.info("anchor Encode_stripe " + seq + " Data_start_reading " + System.nanoTime());

            for (int i = 0; i < blocks.length; i++) {
                RaidUtils.readTillEnd(blocks[i], readBufs[i], true);
            }

            LOG.info("anchor Encode_stripe " + seq + " Data_read " + System.nanoTime());

            // Encode the data read.
            //for (int j = 0; j < bufSize; j++) {
            performEncode(readBufs, writeBufs);
            //}

            // Now that we have some data to write, send it to the temp files.
            for (int i = 0; i < paritySize; i++) {
                if (i == 0) {
                    LOG.info("anchor Output_parity " + i + seq + " Start_output " + System.nanoTime());
                }
                outs[i].write(writeBufs[i], 0, bufSize);
                if (i == 0)
                    LOG.info("anchor Output_parity " + i + seq + " End_output " + System.nanoTime());
            }

            LOG.info("anchor Encode_stripe " + seq + " Parity_written " + System.nanoTime());

            if (reporter != null) {
                reporter.progress();
            }

            seq++;
        }
    }

    void performEncode(byte[][] readBufs, byte[][] writeBufs) {
        /*
        for (int i = 0; i < 2; i++) {
          code[i] = 0;
        }
        for (int i = 0; i < stripeSize; i++) {
          data[i] = readBufs[i][idx] & 0x000000FF;
        }
        */
        //jrsCode.encode(data, code);
        /*
        for (int i = 0; i < 2; i++) {
          writeBufs[i][idx] = (byte)code[i];
        }
        */
        dataBufs.rewind();
        parityBufs.rewind();
        for (int i = 0; i < stripeSize; i++) {
            dataBufs.put(readBufs[i], 0, bufSize);
        }

        LOG.info("anchor Encode_stripe " + seq + " Start_encoding " + System.nanoTime());
        jrsoEncode(dataBufs, parityBufs, stripeSize, paritySize, bufSize, reserve);
        LOG.info("anchor Encode_stripe " + seq + " Encoded " + System.nanoTime());
        for (int i = 0; i < paritySize; i++) {
            parityBufs.get(writeBufs[i], 0, bufSize);
        }
    }

    @Override
    public Path getParityTempPath() {
        return new Path(RaidNode.jrsTempPrefix(conf));
    }
}