Java tutorial
/** * 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 java.io.RandomAccessFile; import java.io.File; import java.io.FileInputStream; 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; import java.util.concurrent.*; /** * encoder is only for migration */ public class JRSEncoder extends Encoder { private int threadNum = 2; static { System.loadLibrary("jrsencoder"); } //data queue, from input thread to encode thread private ArrayBlockingQueue[] q; //trigger queue, input to encode private ArrayBlockingQueue[] fq; //trigger queue, encode to output private ArrayBlockingQueue[] p; public static final Log LOG = LogFactory.getLog("org.apache.hadoop.raid.JRSEncoder"); public JRSEncoder(Configuration conf, int stripeSize, int paritySize) { super(conf, stripeSize, paritySize); threadNum = conf.getInt("hdfs.raid.encoder.threadnum", 2); this.q = new ArrayBlockingQueue[threadNum]; for (int i = 0; i < threadNum; i++) q[i] = new ArrayBlockingQueue<ByteBuffer>(1024); this.p = new ArrayBlockingQueue[threadNum]; for (int i = 0; i < threadNum; i++) p[i] = new ArrayBlockingQueue<Integer>(100); this.fq = new ArrayBlockingQueue[threadNum]; for (int i = 0; i < threadNum; i++) fq[i] = new ArrayBlockingQueue<byte[][]>(2); //encode thread JRSMigrationEncoder[] encoder = new JRSMigrationEncoder[threadNum]; Thread[] es = new Thread[threadNum]; for (int i = 0; i < threadNum; i++) { encoder[i] = new JRSMigrationEncoder(i); es[i] = new Thread(encoder[i]); es[i].start(); } LOG.info("JRSEncoder 21/10/12"); } protected void encodeFileToStream(FileSystem fs, Path srcFile, long srcSize, long blockSize, OutputStream out, Progressable reporter) throws IOException { // (disable) One parity block can be written directly to out, rest to local files. //tmpOuts[0] = out; //File[] tmpFiles = new File[paritySize]; byte[][] bufs = new byte[paritySize][]; /* * signal queue to trigger ouput * No need blocking queue (adjust in the future) */ BlockingQueue<byte[]> closedBuf = new ArrayBlockingQueue<byte[]>(14); /* * Output thread */ DataSender ds = new DataSender(closedBuf, out, blockSize, srcSize); Thread dst = new Thread(ds); dst.start(); // Loop over stripes in the file. for (long stripeStart = 0; stripeStart < srcSize; stripeStart += blockSize * stripeSize) { reporter.progress(); LOG.info("Starting encoding of stripe " + srcFile + ":" + stripeStart); /* * create temp file to write parity block (one file for each block) */ for (int i = 0; i < paritySize; i++) { //tmpFiles[i] = File.createTempFile("parity", "_" + i); //LOG.info("Created tmp file " + tmpFiles[i]); //tmpFiles[i].deleteOnExit(); bufs[i] = new byte[(int) blockSize]; } // Create input streams for blocks in the stripe. InputStream[] blocks = stripeInputs(fs, srcFile, stripeStart, srcSize, blockSize); /* * encode data */ encodeStripe(blocks, stripeStart, blockSize, bufs, reporter); /* * triger output */ for (int i = 0; i < paritySize; i++) { try { closedBuf.put(bufs[i]); } catch (InterruptedException e) { } reporter.progress(); } } try { //waiting for the end of output dst.join(); } catch (InterruptedException e) { LOG.info("thread join interrupted"); } } /* * Class that takes charged of sending coding data */ class DataSender implements Runnable { //signal queue BlockingQueue<byte[]> q; //buf byte[] buf = new byte[bufSize]; //block size long bs; //output stream OutputStream out; //number parity block long mc; DataSender(BlockingQueue<byte[]> q, OutputStream out, long bs, long ss) { this.q = q; this.out = out; this.bs = bs; mc = (ss + bs - 1) / bs; mc = (mc + stripeSize - 1) / stripeSize * paritySize; } public void run() { long count = 0; //loop for sending parity block while (count < mc) { if (count % paritySize == 0) { try { // trigger // indicate the end of the encode thread for (int i = 0; i < threadNum; i++) p[i].take(); } catch (InterruptedException e) { } } byte[] f = null; try { // trigger // indicate the end of the input thread // get the file information f = q.take(); } catch (InterruptedException e) { } LOG.info("anchor Output_parity " + count + " Start_output " + System.nanoTime()); try { //InputStream in = new FileInputStream(f); //RaidUtils.copyBytes(in, out, buf, bs); out.write(f, 0, (int) bs); //in.close(); //f.delete(); //LOG.info("Deleted tmp file " + f); } catch (IOException e) { LOG.info("Unexpected IOException in JRSEncode line 140 " + e); } LOG.info("anchor Output_parity " + count + " End_output " + System.nanoTime()); count++; } } } protected void encodeStripe(InputStream[] blocks, long stripeStartOffset, long blockSize, OutputStream[] outs, Progressable reporter) throws IOException { LOG.error("Unexpect call on encodeStripe"); } protected void encodeStripe(InputStream[] blocks, long stripeStartOffset, long blockSize, byte[][] bufs, Progressable reporter) throws IOException { try { //trigger, pass file info for (int i = 0; i < threadNum; i++) fq[i].put(bufs); } catch (InterruptedException e) { } //seq number int s = 0; //number of data read int read = 0; //useless int cap = 1 + 11 * threadNum; //ByteBuffer[] buf = new ByteBuffer[cap]; //use buffer to pass data, can be replaced by Byte[] ByteBuffer buf; while (read < blockSize) { //indecate the last threadNum# packet boolean important = false; //useless int idx = s % cap; //if(buf[idx] == null) buf[idx] = ByteBuffer.allocate(bufSize*stripeSize+5); //initial buffer buf = ByteBuffer.allocate(bufSize * stripeSize + 64); //buf[idx].putInt(0, s); //seq number buf.putInt(stripeSize * bufSize, s); //check whether the last threadNum# packet if ((blockSize - read + bufSize - 1) / bufSize <= threadNum) { important = true; //buf[idx].put(4, (byte)1); buf.put(4 + stripeSize * bufSize, (byte) 1); } else { //buf[idx].put(4, (byte)0); buf.put(4 + stripeSize * bufSize, (byte) 0); } byte[] bufarr = buf.array(); LOG.info("anchor Encode_stripe " + s + " Data_start_reading " + System.nanoTime()); for (int i = 0; i < stripeSize; i++) { try { //RaidUtils.readTillEnd(blocks[i], buf[idx].array(), true, 5+i*bufSize, bufSize); //read data RaidUtils.readTillEnd(blocks[i], bufarr, true, i * bufSize, bufSize); } catch (IOException e) { } } //LOG.info(s+" read: "+bufarr[5]+" "+bufarr[5+bufSize]+" "+bufarr[5+bufSize*2]); LOG.info("anchor Encode_stripe " + s + " Data_read " + System.nanoTime()); //buf[idx].rewind(); //update position buf.rewind(); int remain = -1; int chosen = -1; //check the most free ring buffer for (int i = 0; i < threadNum; i++) { int rc = q[i].remainingCapacity(); if (remain < rc) { remain = rc; chosen = i; } } //decide to put the data to which ring buffer if (important) { chosen = (((int) blockSize - read + bufSize - 1) / bufSize - 1) % threadNum; } //LOG.info("chosen number: "+chosen+" with seq: "+s+" and buf idx: "+idx); try { //out[chosen].put(buf[idx]); q[chosen].put(buf); } catch (InterruptedException e) { } LOG.info("anchor Encode_stripe " + s + " Data_pushed " + System.nanoTime()); //update status s++; read += bufSize; } } @Override public Path getParityTempPath() { return new Path(RaidNode.jrsTempPrefix(conf)); } /* * Class to take charged of encoding */ class JRSMigrationEncoder implements Runnable { //private final RandomAccessFile[] outs = new RandomAccessFile[paritySize]; private byte[][] bufs; private final ByteBuffer inBuf; private final ByteBuffer outBuf; //thread index private final int idx; native void jrsEncode(ByteBuffer in, ByteBuffer out, int k, int m, int bufSize); JRSMigrationEncoder(int i) { inBuf = ByteBuffer.allocateDirect(bufSize * stripeSize + 64); outBuf = ByteBuffer.allocateDirect(bufSize * paritySize + 64); idx = i; } //private? public void take() { //LOG.info("JRSMigrationEncoder take called"); inBuf.clear(); try { inBuf.put((ByteBuffer) (q[idx].take())); inBuf.rewind(); } catch (InterruptedException e) { } LOG.info("anchor Encode_stripe " + inBuf.getInt(stripeSize * bufSize) + " Start_encoding " + System.nanoTime()); //LOG.info(inBuf.getInt(0)+" take check point: "+inBuf.get(5)+" "+inBuf.get(5+1024*1024)+" "+inBuf.get(5+1024*1024*2)); } public void push() { //LOG.info("JRSMigrationEncoder push called strange 3"); int seq = outBuf.getInt(paritySize * bufSize); LOG.info("anchor Encode_stripe " + seq + " Encoded " + System.nanoTime()); outBuf.rewind(); //redundant, need to change //byte[] bufarr = new byte[outBuf.remaining()]; //outBuf.get(bufarr, 0, bufarr.length); //LOG.info(outBuf.getInt(0)+" push check point: "+outBuf.get(4)+" "+outBuf.get(4+1024*1024)); for (int i = 0; i < paritySize; i++) { //outs[i].seek(seq*bufSize); //outs[i].write(bufarr, 4+i*bufSize, bufSize); outBuf.get(bufs[i], seq * bufSize, bufSize); } //LOG.info("out buf seq number: "+seq); LOG.info("anchor Encode_stripe " + seq + " Parity_written " + System.nanoTime()); } public void run() { //LOG.info("run jrsmigrationencoder"); while (true) { //File[] fs = null; try { //take signal bufs = (byte[][]) (fq[idx].take()); } catch (InterruptedException e) { } //try{ // for(int i = 0; i < paritySize; i++) // this.outs[i] = new RandomAccessFile(fs[i], "rw"); //}catch(IOException e){ // LOG.error("Unexpected IOException in line 197 "+e); //} jrsEncode(inBuf, outBuf, stripeSize, paritySize, bufSize); //try{ // for(int i = 0; i < paritySize; i++){ // this.outs[i].close(); // this.outs[i] = null; // } //}catch(IOException e){ // LOG.error("Unexpected IOException in line 244 "+e); //} //trigger output try { p[idx].put(1); } catch (InterruptedException e) { } } } } /* * No use */ class SeqByteBuffer implements Comparable { private int seq; private ByteBuffer buf; public int getSeq() { return seq; } public SeqByteBuffer(ByteBuffer buf) { seq = buf.getInt(0); this.buf = buf; } public ByteBuffer getBuf() { return buf; } public void update(ByteBuffer b) { buf.put(b); buf.rewind(); seq = b.getInt(0); } public int compareTo(Object o) { int seq1 = this.seq; int seq2 = ((SeqByteBuffer) o).getSeq(); if (seq1 == seq2) return 0; if (seq1 > seq2) return 1; return -1; } } /* * No use */ class DataProducer implements Runnable { private final BlockingQueue<ByteBuffer>[] out; private final InputStream[] blocks; private final int blockSize; DataProducer(BlockingQueue<ByteBuffer>[] out, InputStream[] blocks, int blockSize) { this.out = out; this.blocks = blocks; this.blockSize = blockSize; } public void run() { int s = 0; int read = 0; int cap = 1 + 11 * threadNum; //ByteBuffer[] buf = new ByteBuffer[cap]; ByteBuffer buf; while (read < blockSize) { boolean important = false; int idx = s % cap; //if(buf[idx] == null) buf[idx] = ByteBuffer.allocate(bufSize*stripeSize+5); buf = ByteBuffer.allocate(bufSize * stripeSize + 5); //buf[idx].putInt(0, s); buf.putInt(0, s); if ((blockSize - read + bufSize - 1) / bufSize <= threadNum) { important = true; //buf[idx].put(4, (byte)1); buf.put(4, (byte) 1); } else { //buf[idx].put(4, (byte)0); buf.put(4, (byte) 0); } byte[] bufarr = buf.array(); LOG.info("anchor Encode_stripe " + s + " Data_start_reading " + System.nanoTime()); for (int i = 0; i < stripeSize; i++) { try { //RaidUtils.readTillEnd(blocks[i], buf[idx].array(), true, 5+i*bufSize, bufSize); RaidUtils.readTillEnd(blocks[i], bufarr, true, 5 + i * bufSize, bufSize); } catch (IOException e) { } } LOG.info("anchor Encode_stripe " + s + " Data_read " + System.nanoTime()); //buf[idx].rewind(); buf.rewind(); int remain = -1; int chosen = -1; for (int i = 0; i < threadNum; i++) { int rc = out[i].remainingCapacity(); if (remain < rc) { remain = rc; chosen = i; } } if (important) { chosen = ((blockSize - read + bufSize - 1) / bufSize - 1) % threadNum; } //LOG.info("chosen number: "+chosen+" with seq: "+s+" and buf idx: "+idx); try { //out[chosen].put(buf[idx]); out[chosen].put(buf); } catch (InterruptedException e) { } LOG.info("anchor Encode_stripe " + s + " Data_pushed " + System.nanoTime()); s++; read += bufSize; } } } }