| /** |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.tez.common; |
| |
| import java.util.Set; |
| import java.util.TreeSet; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.tez.dag.api.TezException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Unstable |
| @Private |
| public class JavaOptsChecker { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(JavaOptsChecker.class); |
| private static final Pattern pattern = Pattern.compile("\\s*(-XX:([\\+|\\-]?)(\\S+))\\s*"); |
| |
| public void checkOpts(String opts) throws TezException { |
| Set<String> gcOpts = new TreeSet<String>(); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Checking JVM GC opts: " + opts); |
| } |
| Matcher matcher = pattern.matcher(opts); |
| while (matcher.find()) { |
| if (matcher.groupCount() != 3) { |
| continue; |
| } |
| |
| String opt = matcher.group(3); |
| if (!opt.matches("Use.+GC")) { |
| continue; |
| } |
| |
| int val = ( matcher.group(2).equals("+") ? 1 : -1 ); |
| if (gcOpts.contains(opt)) { |
| val += 1; |
| } |
| |
| if (val > 0) { |
| gcOpts.add(opt); |
| } else { |
| gcOpts.remove(opt); |
| } |
| } |
| |
| if (gcOpts.size() > 1) { |
| // Handle special case for " -XX:+UseParNewGC -XX:+UseConcMarkSweepGC " |
| // which can be specified together. |
| if (gcOpts.size() == 2) { |
| if (gcOpts.contains("UseParNewGC") |
| && gcOpts.contains("UseConcMarkSweepGC")) { |
| return; |
| } |
| } |
| |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Found clashing GC opts" |
| + ", conflicting GC Values=" + gcOpts); |
| } |
| throw new TezException("Invalid/conflicting GC options found," |
| + " cmdOpts=\"" + opts + "\""); |
| } |
| |
| } |
| |
| } |