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java - Memcache (InnvocationTargetException) 炸毁后端实例

转载 作者：行者123 更新时间：2023-11-30 08:18:46 25 4
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我有一个作为后台实例运行的应用引擎模块(b4，基本缩放)，它迭代大量数据并对其进行处理。

当处理的数据量较小时，它可以正确运行，但是当数据变大时，我开始出现多个异常。一开始，InvocationTargetException 导致 MemcacheServiceException，然后被 LogAndContinueErrorHandler 捕获(参见此线程:Backend "Process moved to a different machine" and fails withh error 500)。

在大约 14 秒和另外 10 个类似错误之后，“进程移动到另一台机器。”。我建议原因是 Appengine 识别错误并假设实例有问题并在一段时间后将其关闭。

正如在另一个线程中所建议的，我可以确保转移到另一台机器可以使流程继续进行，但是由于它确实有一个错误，因为某些东西太大/太长了，我最好应该处理这个错误。

这是错误级联开始时的错误，最后错误停止在 com.googlecode.objectify.cache.MemcacheServiceRetryProxy invoke: Error performing memcache operation, retrying: public abstract void 

    15:49:18.779
com.google.appengine.api.memcache.LogAndContinueErrorHandler handleServiceError: Service error in memcache
com.google.appengine.api.memcache.MemcacheServiceException: Memcache getAll: exception getting multiple keys
    at com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.handleApiProxyException(MemcacheServiceApiHelper.java:68)
    at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.absorbParentException(MemcacheServiceApiHelper.java:109)
    at com.google.appengine.api.utils.FutureWrapper.handleParentException(FutureWrapper.java:51)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:26)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.getAll(MemcacheServiceImpl.java:64)
    at com.googlecode.objectify.cache.KeyMemcacheService.getAll(KeyMemcacheService.java:75)
    at com.googlecode.objectify.cache.EntityMemcache.cacheGetAll(EntityMemcache.java:346)
    at com.googlecode.objectify.cache.EntityMemcache.putAll(EntityMemcache.java:285)
    at com.googlecode.objectify.cache.CachingAsyncDatastoreService$3.success(CachingAsyncDatastoreService.java:280)
    at com.googlecode.objectify.cache.CachingAsyncDatastoreService$3.success(CachingAsyncDatastoreService.java:269)
    at com.googlecode.objectify.cache.TriggerSuccessFuture.trigger(TriggerSuccessFuture.java:38)
    at com.googlecode.objectify.cache.TriggerFuture.isDone(TriggerFuture.java:89)
    at com.googlecode.objectify.cache.TriggerFuture.get(TriggerFuture.java:104)
    at com.googlecode.objectify.impl.ResultAdapter.now(ResultAdapter.java:34)
    at com.googlecode.objectify.impl.Round$2.now(Round.java:135)
    at com.googlecode.objectify.impl.Round$2.now(Round.java:132)
    at com.googlecode.objectify.impl.LoadEngine$1.nowUncached(LoadEngine.java:172)
    at com.googlecode.objectify.impl.LoadEngine$1.nowUncached(LoadEngine.java:164)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.impl.Round$1.nowUncached(Round.java:73)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.LoadResult.now(LoadResult.java:25)
    at ch.eaternity.server.DAO.loadEntityNow(DAO.java:383)
    at ch.eaternity.server.services.ProductServiceImpl.getProduct(ProductServiceImpl.java:21)
    at ch.eaternity.server.CompositeRoot.restoreJavaObject(CompositeRoot.java:237)
    at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:179)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:176)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:137)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:45)
    at com.googlecode.objectify.impl.ConcreteEntityMetadata.invokeLifecycleCallbacks(ConcreteEntityMetadata.java:167)
    at com.googlecode.objectify.impl.ConcreteEntityMetadata.access$000(ConcreteEntityMetadata.java:24)
    at com.googlecode.objectify.impl.ConcreteEntityMetadata$1.run(ConcreteEntityMetadata.java:127)
    at com.googlecode.objectify.impl.translate.LoadContext.done(LoadContext.java:70)
    at com.googlecode.objectify.impl.LoadEngine$1.postExecuteHook(LoadEngine.java:191)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:33)
    at com.googlecode.objectify.impl.Round$1.nowUncached(Round.java:73)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.util.ResultNowFunction.apply(ResultNowFunction.java:20)
    at com.googlecode.objectify.util.ResultNowFunction.apply(ResultNowFunction.java:9)
    at com.google.common.collect.Iterators$8.transform(Iterators.java:794)
    at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
    at com.googlecode.objectify.impl.Chunk.next(Chunk.java:27)
    at com.googlecode.objectify.impl.Chunk.next(Chunk.java:10)
    at com.google.common.collect.Iterators$5.next(Iterators.java:553)
    at com.google.common.collect.Iterators$PeekingImpl.peek(Iterators.java:1162)
    at com.googlecode.objectify.impl.ChunkingIterator.hasNext(ChunkingIterator.java:52)
    at com.google.common.collect.Iterators.addAll(Iterators.java:356)
    at com.google.common.collect.Lists.newArrayList(Lists.java:147)
    at com.google.common.collect.Lists.newArrayList(Lists.java:129)
    at com.googlecode.objectify.util.MakeListResult.translate(MakeListResult.java:21)
    at com.googlecode.objectify.util.MakeListResult.translate(MakeListResult.java:11)
    at com.googlecode.objectify.util.ResultTranslator.nowUncached(ResultTranslator.java:21)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.util.ResultProxy.invoke(ResultProxy.java:32)
    at com.sun.proxy.$Proxy23.toArray(Unknown Source)
    at java.util.ArrayList.addAll(ArrayList.java:530)
    at ch.eaternity.server.DAO.loadCompositeRootsByDateAndKitchenId(DAO.java:1058)
    at ch.eaternity.server.services.ReportServiceImpl.loadCompositeRoots(ReportServiceImpl.java:75)
    at ch.eaternity.server.services.ReportServiceImpl.loadSupplies(ReportServiceImpl.java:24)
    at ch.eaternity.server.reports.GeneralKitchenDataAnalyzer.generateAndSaveConcreteGeneralKitchenData(GeneralKitchenDataAnalyzer.java:45)
    at ch.eaternity.server.servlets.ReportGeneratingServlet.kickOffReportDataGeneration(ReportGeneratingServlet.java:75)
    at ch.eaternity.server.servlets.ReportGeneratingServlet.doPost(ReportGeneratingServlet.java:46)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at ch.eaternity.server.NamespaceFilter.doFilter(NamespaceFilter.java:36)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:59)
    at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:49)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:254)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
<continued in next message>
   
E
 15:49:18.779
<continued from previous message>
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:480)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:438)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:445)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:220)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:309)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:301)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:442)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:724)
   
I
 15:49:20.272
com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler handleApiProxyException: Memcache putAll: Unknown exception setting 0 keys: 
   
W
 15:49:20.276
com.googlecode.objectify.cache.MemcacheServiceRetryProxy invoke: Error performing memcache operation, retrying: public abstract void com.google.appengine.api.memcache.MemcacheService.putAll(java.util.Map)
java.lang.reflect.InvocationTargetException
    at com.google.appengine.runtime.Request.process-fdcbff8350bb99f7(Request.java)
    at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:45)
    at com.googlecode.objectify.cache.MemcacheServiceRetryProxy.invoke(MemcacheServiceRetryProxy.java:68)
    at com.sun.proxy.$Proxy10.putAll(Unknown Source)
    at com.googlecode.objectify.cache.KeyMemcacheService.putAll(KeyMemcacheService.java:80)
    at com.googlecode.objectify.cache.EntityMemcache.empty(EntityMemcache.java:312)
    at com.googlecode.objectify.cache.EntityMemcache.putAll(EntityMemcache.java:296)
    at com.googlecode.objectify.cache.CachingAsyncDatastoreService$3.success(CachingAsyncDatastoreService.java:280)
    at com.googlecode.objectify.cache.CachingAsyncDatastoreService$3.success(CachingAsyncDatastoreService.java:269)
    at com.googlecode.objectify.cache.TriggerSuccessFuture.trigger(TriggerSuccessFuture.java:38)
    at com.googlecode.objectify.cache.TriggerFuture.isDone(TriggerFuture.java:89)
    at com.googlecode.objectify.cache.TriggerFuture.get(TriggerFuture.java:104)
    at com.googlecode.objectify.impl.ResultAdapter.now(ResultAdapter.java:34)
    at com.googlecode.objectify.impl.Round$2.now(Round.java:135)
    at com.googlecode.objectify.impl.Round$2.now(Round.java:132)
    at com.googlecode.objectify.impl.LoadEngine$1.nowUncached(LoadEngine.java:172)
    at com.googlecode.objectify.impl.LoadEngine$1.nowUncached(LoadEngine.java:164)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.impl.Round$1.nowUncached(Round.java:73)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.LoadResult.now(LoadResult.java:25)
    at ch.eaternity.server.DAO.loadEntityNow(DAO.java:383)
    at ch.eaternity.server.services.ProductServiceImpl.getProduct(ProductServiceImpl.java:21)
    at ch.eaternity.server.CompositeRoot.restoreJavaObject(CompositeRoot.java:237)
    at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:45)
    at com.googlecode.objectify.impl.ConcreteEntityMetadata.invokeLifecycleCallbacks(ConcreteEntityMetadata.java:167)
    at com.googlecode.objectify.impl.ConcreteEntityMetadata.access$000(ConcreteEntityMetadata.java:24)
    at com.googlecode.objectify.impl.ConcreteEntityMetadata$1.run(ConcreteEntityMetadata.java:127)
    at com.googlecode.objectify.impl.translate.LoadContext.done(LoadContext.java:70)
    at com.googlecode.objectify.impl.LoadEngine$1.postExecuteHook(LoadEngine.java:191)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:33)
    at com.googlecode.objectify.impl.Round$1.nowUncached(Round.java:73)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.util.ResultNowFunction.apply(ResultNowFunction.java:20)
    at com.googlecode.objectify.util.ResultNowFunction.apply(ResultNowFunction.java:9)
    at com.google.common.collect.Iterators$8.transform(Iterators.java:794)
    at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
    at com.googlecode.objectify.impl.Chunk.next(Chunk.java:27)
    at com.googlecode.objectify.impl.Chunk.next(Chunk.java:10)
    at com.google.common.collect.Iterators$5.next(Iterators.java:553)
    at com.google.common.collect.Iterators$PeekingImpl.peek(Iterators.java:1162)
    at com.googlecode.objectify.impl.ChunkingIterator.hasNext(ChunkingIterator.java:52)
    at com.google.common.collect.Iterators.addAll(Iterators.java:356)
    at com.google.common.collect.Lists.newArrayList(Lists.java:147)
    at com.google.common.collect.Lists.newArrayList(Lists.java:129)
    at com.googlecode.objectify.util.MakeListResult.translate(MakeListResult.java:21)
    at com.googlecode.objectify.util.MakeListResult.translate(MakeListResult.java:11)
    at com.googlecode.objectify.util.ResultTranslator.nowUncached(ResultTranslator.java:21)
    at com.googlecode.objectify.util.ResultCache.now(ResultCache.java:30)
    at com.googlecode.objectify.util.ResultProxy.invoke(ResultProxy.java:32)
    at com.sun.proxy.$Proxy23.toArray(Unknown Source)
    at java.util.ArrayList.addAll(ArrayList.java:530)
    at ch.eaternity.server.DAO.loadCompositeRootsByDateAndKitchenId(DAO.java:1058)
    at ch.eaternity.server.services.ReportServiceImpl.loadCompositeRoots(ReportServiceImpl.java:75)
    at ch.eaternity.server.services.ReportServiceImpl.loadSupplies(ReportServiceImpl.java:24)
    at ch.eaternity.server.reports.GeneralKitchenDataAnalyzer.generateAndSaveConcreteGeneralKitchenData(GeneralKitchenDataAnalyzer.java:45)
    at ch.eaternity.server.servlets.ReportGeneratingServlet.kickOffReportDataGeneration(ReportGeneratingServlet.java:75)
    at ch.eaternity.server.servlets.ReportGeneratingServlet.doPost(ReportGeneratingServlet.java:46)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at ch.eaternity.server.NamespaceFilter.doFilter(NamespaceFilter.java:36)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:59)
    at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:49)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:438)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:445)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:220)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:309)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:301)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:442)
    at java.lang.Thread.run(Thread.java:724)
Caused by: com.google.appengine.api.memcache.MemcacheServiceException: Memcache putAll: Unknown exception setting 0 keys
    at com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.handleApiProxyException(MemcacheServiceApiHelper.java:68)
    at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$RpcResponseHandlerForPut.handleApiProxyException(AsyncMemcacheServiceImpl.java:348)
    at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.absorbParentException(MemcacheServiceApiHelper.java:109)
<continued in next message>
   
W
 15:49:20.276
<continued from previous message>
    at com.google.appengine.api.utils.FutureWrapper.handleParentException(FutureWrapper.java:51)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:88)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:26)
    at com.google.appengine.api.memcache.MemcacheServiceImpl.putAll(MemcacheServiceImpl.java:115)
    ... 91 more

我不确定它是否与 appengine 或 objectify 相关，请参阅此线程进行比较: https://groups.google.com/forum/#!msg/objectify-appengine/GzFmrQNMaI0/1ALIKbEY9agJ

物化:4.0RC2应用引擎:1.9.9

更新 1升级到 Objectify 4.1.3 后，不再出现异常，但在迭代中的同一点 Process 移动到另一台机器。 出现警告。为什么要转移到另一台机器上？

更新 2与此同时，我达到了内存限制的几倍，最终将后端实例提升到 B4，这暂时解决了问题。

java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space

现在错误稍微移动了一点，现在我只得到大约 100 次这个异常，直到进程被移动到另一台机器。

com.google.appengine.api.memcache.MemcacheServiceException: Memcache getAll: exception getting multiple keys

更新 3有时批处理也顺利跑通!我不明白...我会尝试弄清楚什么时候不成功。

有人知道问题出在哪里吗？如何解决？非常感谢!

最佳答案

我无法直接回答您的问题，但我可以阐明 Objectify(和 GAE)在 WRT 内存缓存中的行为。

Objectify 使用 memcache 作为通读缓存，因此“memcache 不可用”在所有实际用途上与“空结果”相同 - Objectify 会从数据存储中获取数据。 GAE 的内存缓存 API 有一个 LogAndContinueErrorHandler 正是为了这个目的 - 内存缓存错误被记录下来，但在其他方面被忽略。

不幸的是，Google 的 LogAndContinueErrorHandler 有一个错误，某些类型的内存缓存错误既不会被记录也不会被忽略。 Objectify 获得了一些新行为(恰当命名的 MemcacheServiceRetryProxy)，它会重试几次内存缓存 API 调用，然后放弃，返回空结果。这就是您在 4.0RC2 中看到的。

一段时间后，Google 修复了处理程序，不是通过更改 LogAndContinueErrorHandler 的行为(被认为可能某些用户依赖于确切的行为)，而是通过弃用该类并添加 ConsistentLogAndContinueErrorHandler 表现得更一致。更高版本的 Objectify 切换为使用此功能，现在您可以在 4.1.3 中看到这种行为 - 噪声更少。

这就是故事的一部分。故事的另一部分是，在某些时候，Objectify 在优化对 memcache 的调用方面有点自鸣得意，有时会将 memcache 调用优化为零长度的键列表。 Memcache API 不喜欢这样，可能 Memcache putAll: Unknown exception setting 0 keys 就是这样。如果没有操作，较新版本的 Objectify 会跳过内存缓存调用。

至于Process moved to a different machine.，我不知道。可能相关，也可能不相关。

关于java - Memcache (InnvocationTargetException) 炸毁后端实例，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27227112/

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