如何在Google App Engine Java上减少Appstats的内存使用量
这与Java Appengine APPSTATS问题导致java内存不足错误有关 。
Appstats似乎在128MB实例上导致java.lang.OutOfMemoryError，我想知道是否有办法减少日志记录量。 有没有办法从堆栈跟踪中过滤一些包名？
GAE API：
@14ms memcache.Get real=7ms api=0ms Stack: com.google.appengine.tools.appstats.Recorder:290 makeAsyncCall() com.google.apphosting.api.ApiProxy:184 makeAsyncCall() com.google.apphosting.api.ApiProxy:123 makeAsyncCall() com.google.appengine.api.memcache.MemcacheServiceApiHelper:104 makeAsyncCall() com.google.appengine.api.memcache.AsyncMemcacheServiceImpl:372 doGetAll() com.google.appengine.api.memcache.AsyncMemcacheServiceImpl:333 getIdentifiables() com.google.appengine.api.memcache.MemcacheServiceImpl:61 getIdentifiables() 我的appplication API：
com.googlecode.objectify.cache.EntityMemcache:215 getAll() com.googlecode.objectify.cache.CachingAsyncDatastoreService:253 get() com.googlecode.objectify.cache.CachingDatastoreService:161 get() com.googlecode.objectify.cache.CachingDatastoreService:147 get() com.googlecode.objectify.cache.CachingDatastoreService:128 get() siena.gae.GaePersistenceManager:231 getByKey() siena.Model:106 getByKey() com.sirtrack.iridium.model.GroupEntity:147 getByKey() com.sirtrack.iridium.task.ProjectUpdateTask:49 doPost()
无关紧要的：
javax.servlet.http.HttpServlet:637 service() javax.servlet.http.HttpServlet:717 service() org.mortbay.jetty.servlet.ServletHolder:511 handle() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1166 doFilter() com.google.appengine.tools.appstats.AppstatsFilter:141 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.SiteFilter:106 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.RewriteFilter:79 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.AuthenticationFilter:83 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.PluginCronFilter:78 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.LanguageFilter:66 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.UpdateFilter:78 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.InitFilter:80 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.vosao.filter.ContextFilter:74 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() com.google.apphosting.utils.servlet.ParseBlobUploadFilter:102 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() com.google.apphosting.runtime.jetty.SaveSessionFilter:35 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() com.google.apphosting.utils.servlet.TransactionCleanupFilter:43 doFilter() org.mortbay.jetty.servlet.ServletHandler$CachedChain:1157 doFilter() org.mortbay.jetty.servlet.ServletHandler:388 handle() org.mortbay.jetty.security.SecurityHandler:216 handle() org.mortbay.jetty.servlet.SessionHandler:182 handle() org.mortbay.jetty.handler.ContextHandler:765 handle() org.mortbay.jetty.webapp.WebAppContext:418 handle() com.google.apphosting.runtime.jetty.AppVersionHandlerMap:249 handle() org.mortbay.jetty.handler.HandlerWrapper:152 handle() org.mortbay.jetty.Server:326 handle() org.mortbay.jetty.HttpConnection:542 handleRequest() org.mortbay.jetty.HttpConnection$RequestHandler:923 headerComplete() com.google.apphosting.runtime.jetty.RpcRequestParser:76 parseAvailable() org.mortbay.jetty.HttpConnection:404 handle() com.google.apphosting.runtime.jetty.JettyServletEngineAdapter:135 serviceRequest() com.google.apphosting.runtime.JavaRuntime$RequestRunnable:446 run() com.google.tracing.TraceContext$TraceContextRunnable:449 runInContext() com.google.tracing.TraceContext$TraceContextRunnable$1:455 run() com.google.tracing.TraceContext:695 runInContext() com.google.tracing.TraceContext$AbstractTraceContextCallback:333 runInInheritedContextNoUnref() com.google.tracing.TraceContext$AbstractTraceContextCallback:325 runInInheritedContext() com.google.tracing.TraceContext$TraceContextRunnable:453 run() com.google.apphosting.runtime.ThreadGroupPool$PoolEntry:251 run() java.lang.Thread:679 run()
这是可能由堆栈跟踪OutOfMemoryError引起的堆栈跟踪：
Error for /_ah/queue/projectupdate java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:3057) at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:117) at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:407) at java.lang.StringBuffer.append(StringBuffer.java:241) at java.io.StringWriter.write(StringWriter.java:112) at java.io.PrintWriter.write(PrintWriter.java:429) at java.io.PrintWriter.write(PrintWriter.java:446) at java.io.PrintWriter.print(PrintWriter.java:576) at java.io.PrintWriter.println(PrintWriter.java:712) at java.lang.Throwable.printStackTrace(Throwable.java:529) at com.google.appengine.tools.appstats.Recorder.createStackTrace(Recorder.java:160) at com.google.appengine.tools.appstats.Recorder.initializeIntermediary(Recorder.java:271) at com.google.appengine.tools.appstats.Recorder.makeAsyncCall(Recorder.java:290) at com.googlecode.objectify.cache.TriggerFutureHook.makeAsyncCall(TriggerFutureHook.java:144) at com.google.apphosting.api.ApiProxy.makeAsyncCall(ApiProxy.java:184)
对于Google工程师，这里是指向这些错误的链接
我在com.google.appengine.tools.appstats.Recorder.java类中找到了一个名为“maxLinesOfStackTrace”的无证（AFAIK）参数。
在web.xml中：
appstats com.google.appengine.tools.appstats.AppstatsFilter maxLinesOfStackTrace 16
它似乎在本地工作，我会告诉你它是否也有助于避免OutOfMemoryError。