Google app engine 在GAE 1.7.3中使用DeferredTasks时PermGen空间不足

最近我切换到谷歌应用引擎Java SDK1.7.3。从那时起，每次提交到任务队列时，我的PermGen空间都会用完

• 将应用程序部署到应用程序引擎时不会发生这种情况。它只在本地发生。但它阻碍了我的本地测试，并使集成测试失败
• 它发生在MacOSX 10.7.5和Java6上

  $ java -version 
  java version "1.6.0_37"
  Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909)
  Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode)
  

• 这是问题发生时我看到的stacktrace的一部分

  INFO: Successfully processed ../target/projectName/WEB-INF/queue.xml
  Nov 1, 2012 3:04:00 PM com.google.appengine.api.taskqueue.dev.LocalTaskQueue init
  INFO: LocalTaskQueue is initialized
  Nov 1, 2012 3:04:01 PM org.quartz.simpl.SimpleThreadPool initialize
  INFO: Job execution threads will use class loader of thread: 1255545583@qtp-1458850232-0
  Nov 1, 2012 3:04:02 PM org.quartz.core.QuartzScheduler <init>
  INFO: Quartz Scheduler v.UNKNOWN.UNKNOWN.UNKNOWN created.
  Nov 1, 2012 3:04:02 PM org.quartz.simpl.RAMJobStore initialize
  INFO: RAMJobStore initialized.
  Nov 1, 2012 3:04:02 PM org.quartz.impl.StdSchedulerFactory instantiate
  INFO: Quartz scheduler 'DefaultQuartzScheduler' initialized from default resource file in Quartz package: 'quartz.properties'
  Nov 1, 2012 3:04:02 PM org.quartz.impl.StdSchedulerFactory instantiate
  INFO: Quartz scheduler version: UNKNOWN.UNKNOWN.UNKNOWN
  Nov 1, 2012 3:04:02 PM org.quartz.core.QuartzScheduler start
  INFO: Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started.
  Nov 1, 2012 3:04:02 PM com.google.appengine.api.taskqueue.dev.LocalTaskQueue start_
  INFO: Local task queue initialized with base url http://localhost:8083
  Exception in thread "DefaultQuartzScheduler_Worker-9" java.lang.OutOfMemoryError: PermGen space
          at java.lang.ClassLoader.defineClass1(Native Method)
          at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
          at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
          at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
          at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
          at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
          at com.google.appengine.tools.development.DevAppServerClassLoader.loadClass(DevAppServerClassLoader.java:92)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
          at com.google.appengine.api.urlfetch.URLFetchServicePb$URLFetchRequest.newBuilder(URLFetchServicePb.java:1902)
          at com.google.appengine.api.taskqueue.dev.UrlFetchJob.newFetchRequest(UrlFetchJob.java:152)
          at com.google.appengine.api.taskqueue.dev.UrlFetchJob.execute(UrlFetchJob.java:83)
          at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
          at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)
  Exception in thread "1255545583@qtp-1458850232-0" java.lang.OutOfMemoryError: PermGen space
  Exception in thread "Timer-6" java.lang.OutOfMemoryError: PermGen space
  Exception in thread "Timer-4" java.lang.OutOfMemoryError: PermGen space
  Exception in thread "Timer-2" java.lang.OutOfMemoryError: PermGen space
  Exception in thread "Timer-8" java.lang.OutOfMemoryError: PermGen space
  

  其他人能复制这个吗？谢谢

  ---

  更新：我在GAE的谷歌代码页上创建了此问题。
  此问题已于2014年8月12日在1.9.6 AppEngine SDK版本中得到解决。

  ---

  MaxPermSize只能在本地开发服务器上设置。
  为什么不使用XXMaxPermSize JVM arg增加内存量呢？首先，我认为我的应用程序/GAE本身出了问题。我没有做什么特别的事情，我想知道为什么我的PermGen空间用完了。我实际上是在启动GAE并调用一个URL来添加延迟任务。其次，我使用的是maven gae插件。（1）将XXMaxPermSize添加到MAVEN_选项中，（2）将其添加到。。maven的gae插件不会改变PermGen空间的大小。Maven启动的运行GAE的JVM没有接收到这一点。在GAE中运行时，我们如何增加PermGen空间？这可能吗？您不能更改服务器上的实例配置。只能对本地开发环境执行此操作。只能在本地开发服务器上设置MaxPermSize，怎样？

  class Foo {
      private void enqueueTask() {
          queue.add(TaskOptions.Builder.withPayload(new Task()).countdownMillis(10 * 1000));
      }
  
      private static class Task implements DeferredTask {
          private static final MemcacheService memcache = MemcacheServiceFactory.getMemcacheService();
          private static final Logger log = Logger.getLogger(Task.class.getName());
  
          @Override
          public void run() {
              final String key = ...;
  
              if (memcache.contains(key)) {
                  final Object value = memcache.get(key);
  
                  if (some condition depending on value) {
                      memcache.delete(key);
                      memcache.increment(some other field, -1l);
                  }
              } else {
                  log.warning("error message");
              }
          }
      }
  }