meszibalu commented on a change in pull request #675: HBASE-23085: Network and Data related Actions URL: https://github.com/apache/hbase/pull/675#discussion_r332019607
########## File path: hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/actions/AddCPULoadAction.java ########## @@ -0,0 +1,69 @@ +/** + * 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.hbase.chaos.actions; + +import java.io.IOException; + +import org.apache.hadoop.hbase.ServerName; +import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Action that adds high cpu load to a random regionserver for a given duration + */ +public class AddCPULoadAction extends CommandAction { + protected static final Logger LOG = LoggerFactory.getLogger(AddCPULoadAction.class); + private static final String CPU_LOAD_COMMAND = + "seq 1 %s | xargs -I{} -n 1 -P %s timeout %s dd if=/dev/urandom of=/dev/null bs=1M " + + "iflag=fullblock"; + + private final long duration; + private long processes; + + /** + * Add high load to cpu + * + * @param duration Duration that this thread should generate the load for in miliseconds + * @param processes The number of parallel processes, should be equal to cpu threads for max load + */ + public AddCPULoadAction(long duration, long processes, long timeout) { + super(timeout); + this.duration = duration; + this.processes = processes; + } + + protected void localPerform() throws IOException { + LOG.info("Starting to execute AddCPULoadAction"); + ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getCurrentServers()); + String hostname = server.getHostname(); + + try { + clusterManager.execSudo(hostname, timeout, getCommand()); + } catch (IOException ex){ + //This will always happen. We use timeout to kill a continously running process + //after the duration expires Review comment: I think we should add `/bin/true` at the end of the command line. We don't know at this point whether we got a network error for example or the script returned with error. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
