| /** |
| * 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.cassandra.stress; |
| |
| import java.io.*; |
| |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| import org.apache.cassandra.stress.settings.StressSettings; |
| import org.apache.cassandra.stress.util.MultiResultLogger; |
| import org.apache.commons.lang3.exception.ExceptionUtils; |
| |
| public final class Stress |
| { |
| |
| /** |
| * Known issues: |
| * - uncertainty/stderr assumes op-rates are normally distributed. Due to GC (and possibly latency stepping from |
| * different media, though the variance of request ratio across media should be normally distributed), they are not. |
| * Should attempt to account for pauses in stderr calculation, possibly by assuming these pauses are a separate |
| * normally distributed occurrence |
| * - Under very mixed work loads, the uncertainty calculations and op/s reporting really don't mean much. Should |
| * consider breaking op/s down per workload, or should have a lower-bound on inspection interval based on clustering |
| * of operations and thread count. |
| * |
| * |
| * Future improvements: |
| * - Configurable connection compression |
| * - Java driver support |
| * - Per column data generators |
| * - Automatic column/schema detection if provided with a CF |
| * - target rate produces a very steady work rate, and if we want to simulate a real op rate for an |
| * application we should have some variation in the actual op rate within any time-slice. |
| * - auto rate should vary the thread count based on performance improvement, potentially starting on a very low |
| * thread count with a high error rate / low count to get some basic numbers |
| */ |
| |
| public static void main(String[] arguments) throws Exception |
| { |
| System.exit(run(arguments)); |
| } |
| |
| private static int run(String[] arguments) |
| { |
| try |
| { |
| DatabaseDescriptor.clientInitialization(); |
| |
| final StressSettings settings; |
| try |
| { |
| settings = StressSettings.parse(arguments); |
| if (settings == null) |
| return 0; // special settings action |
| } |
| catch (IllegalArgumentException e) |
| { |
| System.out.printf("%s%n", e.getMessage()); |
| printHelpMessage(); |
| return 1; |
| } |
| catch (Throwable e) |
| { |
| Throwable rc = ExceptionUtils.getRootCause(e); |
| if (rc instanceof FileNotFoundException) |
| { |
| System.out.printf("File '%s' doesn't exist!%n", rc.getMessage()); |
| printHelpMessage(); |
| return 1; |
| } |
| throw e; |
| } |
| |
| MultiResultLogger logout = settings.log.getOutput(); |
| |
| if (! settings.log.noSettings) |
| { |
| settings.printSettings(logout); |
| } |
| |
| if (settings.graph.inGraphMode()) |
| { |
| logout.addStream(new PrintStream(settings.graph.temporaryLogFile)); |
| } |
| |
| StressAction stressAction = new StressAction(settings, logout); |
| stressAction.run(); |
| logout.flush(); |
| if (settings.graph.inGraphMode()) |
| new StressGraph(settings, arguments).generateGraph(); |
| } |
| catch (Throwable t) |
| { |
| t.printStackTrace(); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * Printing out help message |
| */ |
| public static void printHelpMessage() |
| { |
| StressSettings.printHelp(); |
| } |
| } |