| /** |
| * 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.hdfs; |
| |
| import java.io.IOException; |
| import java.util.Date; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.util.StringUtils; |
| import org.apache.hadoop.mapred.JobConf; |
| |
| /** |
| * This program executes a specified operation that applies load to |
| * the NameNode. Possible operations include create/writing files, |
| * opening/reading files, renaming files, and deleting files. |
| * |
| * When run simultaneously on multiple nodes, this program functions |
| * as a stress-test and benchmark for namenode, especially when |
| * the number of bytes written to each file is small. |
| * |
| * This version does not use the map reduce framework |
| * |
| */ |
| public class NNBenchWithoutMR { |
| |
| private static final Log LOG = LogFactory.getLog( |
| "org.apache.hadoop.hdfs.NNBench"); |
| |
| // variable initialzed from command line arguments |
| private static long startTime = 0; |
| private static int numFiles = 0; |
| private static long bytesPerBlock = 1; |
| private static long blocksPerFile = 0; |
| private static long bytesPerFile = 1; |
| private static Path baseDir = null; |
| |
| // variables initialized in main() |
| private static FileSystem fileSys = null; |
| private static Path taskDir = null; |
| private static byte[] buffer; |
| private static long maxExceptionsPerFile = 200; |
| |
| /** |
| * Returns when the current number of seconds from the epoch equals |
| * the command line argument given by <code>-startTime</code>. |
| * This allows multiple instances of this program, running on clock |
| * synchronized nodes, to start at roughly the same time. |
| */ |
| |
| static void barrier() { |
| long sleepTime; |
| while ((sleepTime = startTime - System.currentTimeMillis()) > 0) { |
| try { |
| Thread.sleep(sleepTime); |
| } catch (InterruptedException ex) { |
| //This left empty on purpose |
| } |
| } |
| } |
| |
| static private void handleException(String operation, Throwable e, |
| int singleFileExceptions) { |
| LOG.warn("Exception while " + operation + ": " + |
| StringUtils.stringifyException(e)); |
| if (singleFileExceptions >= maxExceptionsPerFile) { |
| throw new RuntimeException(singleFileExceptions + |
| " exceptions for a single file exceeds threshold. Aborting"); |
| } |
| } |
| |
| /** |
| * Create and write to a given number of files. Repeat each remote |
| * operation until is suceeds (does not throw an exception). |
| * |
| * @return the number of exceptions caught |
| */ |
| static int createWrite() { |
| int totalExceptions = 0; |
| FSDataOutputStream out = null; |
| boolean success; |
| for (int index = 0; index < numFiles; index++) { |
| int singleFileExceptions = 0; |
| do { // create file until is succeeds or max exceptions reached |
| try { |
| out = fileSys.create( |
| new Path(taskDir, "" + index), false, 512, |
| (short)1, bytesPerBlock); |
| success = true; |
| } catch (IOException ioe) { |
| success=false; |
| totalExceptions++; |
| handleException("creating file #" + index, ioe, |
| ++singleFileExceptions); |
| } |
| } while (!success); |
| long toBeWritten = bytesPerFile; |
| while (toBeWritten > 0) { |
| int nbytes = (int) Math.min(buffer.length, toBeWritten); |
| toBeWritten -= nbytes; |
| try { // only try once |
| out.write(buffer, 0, nbytes); |
| } catch (IOException ioe) { |
| totalExceptions++; |
| handleException("writing to file #" + index, ioe, |
| ++singleFileExceptions); |
| } |
| } |
| do { // close file until is succeeds |
| try { |
| out.close(); |
| success = true; |
| } catch (IOException ioe) { |
| success=false; |
| totalExceptions++; |
| handleException("closing file #" + index, ioe, |
| ++singleFileExceptions); |
| } |
| } while (!success); |
| } |
| return totalExceptions; |
| } |
| |
| /** |
| * Open and read a given number of files. |
| * |
| * @return the number of exceptions caught |
| */ |
| static int openRead() { |
| int totalExceptions = 0; |
| FSDataInputStream in; |
| for (int index = 0; index < numFiles; index++) { |
| int singleFileExceptions = 0; |
| try { |
| in = fileSys.open(new Path(taskDir, "" + index), 512); |
| long toBeRead = bytesPerFile; |
| while (toBeRead > 0) { |
| int nbytes = (int) Math.min(buffer.length, toBeRead); |
| toBeRead -= nbytes; |
| try { // only try once && we don't care about a number of bytes read |
| in.read(buffer, 0, nbytes); |
| } catch (IOException ioe) { |
| totalExceptions++; |
| handleException("reading from file #" + index, ioe, |
| ++singleFileExceptions); |
| } |
| } |
| in.close(); |
| } catch (IOException ioe) { |
| totalExceptions++; |
| handleException("opening file #" + index, ioe, ++singleFileExceptions); |
| } |
| } |
| return totalExceptions; |
| } |
| |
| /** |
| * Rename a given number of files. Repeat each remote |
| * operation until is suceeds (does not throw an exception). |
| * |
| * @return the number of exceptions caught |
| */ |
| static int rename() { |
| int totalExceptions = 0; |
| boolean success; |
| for (int index = 0; index < numFiles; index++) { |
| int singleFileExceptions = 0; |
| do { // rename file until is succeeds |
| try { |
| // Possible result of this operation is at no interest to us for it |
| // can return false only if the namesystem |
| // could rename the path from the name |
| // space (e.g. no Exception has been thrown) |
| fileSys.rename(new Path(taskDir, "" + index), |
| new Path(taskDir, "A" + index)); |
| success = true; |
| } catch (IOException ioe) { |
| success = false; |
| totalExceptions++; |
| handleException("creating file #" + index, ioe, ++singleFileExceptions); |
| } |
| } while (!success); |
| } |
| return totalExceptions; |
| } |
| |
| /** |
| * Delete a given number of files. Repeat each remote |
| * operation until is suceeds (does not throw an exception). |
| * |
| * @return the number of exceptions caught |
| */ |
| static int delete() { |
| int totalExceptions = 0; |
| boolean success; |
| for (int index = 0; index < numFiles; index++) { |
| int singleFileExceptions = 0; |
| do { // delete file until is succeeds |
| try { |
| // Possible result of this operation is at no interest to us for it |
| // can return false only if namesystem |
| // delete could remove the path from the name |
| // space (e.g. no Exception has been thrown) |
| fileSys.delete(new Path(taskDir, "A" + index), true); |
| success = true; |
| } catch (IOException ioe) { |
| success=false; |
| totalExceptions++; |
| handleException("creating file #" + index, ioe, ++singleFileExceptions); |
| } |
| } while (!success); |
| } |
| return totalExceptions; |
| } |
| |
| /** |
| * This launches a given namenode operation (<code>-operation</code>), |
| * starting at a given time (<code>-startTime</code>). The files used |
| * by the openRead, rename, and delete operations are the same files |
| * created by the createWrite operation. Typically, the program |
| * would be run four times, once for each operation in this order: |
| * createWrite, openRead, rename, delete. |
| * |
| * <pre> |
| * Usage: nnbench |
| * -operation <one of createWrite, openRead, rename, or delete> |
| * -baseDir <base output/input DFS path> |
| * -startTime <time to start, given in seconds from the epoch> |
| * -numFiles <number of files to create, read, rename, or delete> |
| * -blocksPerFile <number of blocks to create per file> |
| * [-bytesPerBlock <number of bytes to write to each block, default is 1>] |
| * [-bytesPerChecksum <value for io.bytes.per.checksum>] |
| * </pre> |
| * |
| * @param args is an array of the program command line arguments |
| * @throws IOException indicates a problem with test startup |
| */ |
| public static void main(String[] args) throws IOException { |
| String version = "NameNodeBenchmark.0.3"; |
| System.out.println(version); |
| int bytesPerChecksum = -1; |
| |
| String usage = |
| "Usage: nnbench " + |
| " -operation <one of createWrite, openRead, rename, or delete> " + |
| " -baseDir <base output/input DFS path> " + |
| " -startTime <time to start, given in seconds from the epoch> " + |
| " -numFiles <number of files to create> " + |
| " -blocksPerFile <number of blocks to create per file> " + |
| " [-bytesPerBlock <number of bytes to write to each block, default is 1>] " + |
| " [-bytesPerChecksum <value for io.bytes.per.checksum>]" + |
| "Note: bytesPerBlock MUST be a multiple of bytesPerChecksum"; |
| |
| String operation = null; |
| for (int i = 0; i < args.length; i++) { // parse command line |
| if (args[i].equals("-baseDir")) { |
| baseDir = new Path(args[++i]); |
| } else if (args[i].equals("-numFiles")) { |
| numFiles = Integer.parseInt(args[++i]); |
| } else if (args[i].equals("-blocksPerFile")) { |
| blocksPerFile = Integer.parseInt(args[++i]); |
| } else if (args[i].equals("-bytesPerBlock")) { |
| bytesPerBlock = Long.parseLong(args[++i]); |
| } else if (args[i].equals("-bytesPerChecksum")) { |
| bytesPerChecksum = Integer.parseInt(args[++i]); |
| } else if (args[i].equals("-startTime")) { |
| startTime = Long.parseLong(args[++i]) * 1000; |
| } else if (args[i].equals("-operation")) { |
| operation = args[++i]; |
| } else { |
| System.out.println(usage); |
| System.exit(-1); |
| } |
| } |
| bytesPerFile = bytesPerBlock * blocksPerFile; |
| |
| JobConf jobConf = new JobConf(new Configuration(), NNBench.class); |
| |
| if ( bytesPerChecksum < 0 ) { // if it is not set in cmdline |
| bytesPerChecksum = jobConf.getInt("io.bytes.per.checksum", 512); |
| } |
| jobConf.set("io.bytes.per.checksum", Integer.toString(bytesPerChecksum)); |
| |
| System.out.println("Inputs: "); |
| System.out.println(" operation: " + operation); |
| System.out.println(" baseDir: " + baseDir); |
| System.out.println(" startTime: " + startTime); |
| System.out.println(" numFiles: " + numFiles); |
| System.out.println(" blocksPerFile: " + blocksPerFile); |
| System.out.println(" bytesPerBlock: " + bytesPerBlock); |
| System.out.println(" bytesPerChecksum: " + bytesPerChecksum); |
| |
| if (operation == null || // verify args |
| baseDir == null || |
| numFiles < 1 || |
| blocksPerFile < 1 || |
| bytesPerBlock < 0 || |
| bytesPerBlock % bytesPerChecksum != 0) |
| { |
| System.err.println(usage); |
| System.exit(-1); |
| } |
| |
| fileSys = FileSystem.get(jobConf); |
| String uniqueId = java.net.InetAddress.getLocalHost().getHostName(); |
| taskDir = new Path(baseDir, uniqueId); |
| // initialize buffer used for writing/reading file |
| buffer = new byte[(int) Math.min(bytesPerFile, 32768L)]; |
| |
| Date execTime; |
| Date endTime; |
| long duration; |
| int exceptions = 0; |
| barrier(); // wait for coordinated start time |
| execTime = new Date(); |
| System.out.println("Job started: " + startTime); |
| if (operation.equals("createWrite")) { |
| if (!fileSys.mkdirs(taskDir)) { |
| throw new IOException("Mkdirs failed to create " + taskDir.toString()); |
| } |
| exceptions = createWrite(); |
| } else if (operation.equals("openRead")) { |
| exceptions = openRead(); |
| } else if (operation.equals("rename")) { |
| exceptions = rename(); |
| } else if (operation.equals("delete")) { |
| exceptions = delete(); |
| } else { |
| System.err.println(usage); |
| System.exit(-1); |
| } |
| endTime = new Date(); |
| System.out.println("Job ended: " + endTime); |
| duration = (endTime.getTime() - execTime.getTime()) /1000; |
| System.out.println("The " + operation + " job took " + duration + " seconds."); |
| System.out.println("The job recorded " + exceptions + " exceptions."); |
| } |
| } |