尝试读取使用Ktor / Java8在App Engine Standard上运行的数据时，Firestore客户端会挂起

时间：2019-03-06 13:22:19

标签： firebase google-app-engine kotlin google-cloud-firestore ktor

我在Google App Engine标准环境（使用Java8，Kotlin和Ktor）中与Firestore集成时遇到问题。当我尝试执行任何操作时，Firestore客户端会挂起。在开发应用程序服务器中运行时，它可以正常工作，但在生产环境中运行时，则不能。

我正在跑步：

  • Ktor 1.1.2
  • 科特林1.3.21
  • com.google.cloud:google-cloud-firestore（版本0.81.0-beta）
  • 本机模式下的Firestore

我已经用以下简单方法进行了测试：

get("/test") {
    try {
        val firestore = FirestoreOptions.getDefaultInstance().service
        val user = firestore.collection("user").document("testusername").get().get()
        call.respond(user.getString("name")!!)
    } catch (ex: Exception) {
        call.respond("Exception: " + ex)
    }
}

在网络浏览器中访问/test会使网站挂起一分钟，然后返回500错误。

Google Cloud Platform中记录了以下异常：

[e~website/20190306t125554.416577836925362605].<stdout>: 2019-03-06 13:01:31.306 [RequestEDA5B9B5] ERROR Application - Unhandled: GET - /test
java.lang.InterruptedException: null
    at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:506)
    at com.google.common.util.concurrent.AbstractFuture$TrustedFuture.get(AbstractFuture.java:83)
    at com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:62)
    at com.example.MainApplicationKt$run$4$2.invokeSuspend(MainApplication.kt:93)
    at com.example.MainApplicationKt$run$4$2.invoke(MainApplication.kt)
    at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
    at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
    at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
    at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:157)
    at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:23)
    at io.ktor.routing.Routing.executeResult(Routing.kt:148)
    at io.ktor.routing.Routing.interceptor(Routing.kt:29)
    at io.ktor.routing.Routing$Feature$install$1.invokeSuspend(Routing.kt:93)
    at io.ktor.routing.Routing$Feature$install$1.invoke(Routing.kt)
    at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
    at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
    at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
    at io.ktor.features.ContentNegotiation$Feature$install$1.invokeSuspend(ContentNegotiation.kt:63)
    at io.ktor.features.ContentNegotiation$Feature$install$1.invoke(ContentNegotiation.kt)
    at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
    at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
    at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
    at io.ktor.features.CallLogging$Feature$install$2.invokeSuspend(CallLogging.kt:130)
    at io.ktor.features.CallLogging$Feature$install$2.invoke(CallLogging.kt)
    at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
    at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
    at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
    at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:157)
    at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:23)
    at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invokeSuspend(DefaultEnginePipeline.kt:106)
    at io.ktor.server.engine.DefaultEnginePipelineKt$defaultEnginePipeline$2.invoke(DefaultEnginePipeline.kt)
    at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:278)
    at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:63)
    at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:137)
    at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:157)
    at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:23)
    at io.ktor.server.servlet.KtorServlet$blockingService$1.invokeSuspend(KtorServlet.kt:125)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:32)
    at kotlinx.coroutines.DispatchedKt.resumeCancellable(Dispatched.kt:410)
    at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:25)
    at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109)
    at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:160)
    at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:52)
    at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
    at io.ktor.server.servlet.KtorServlet.blockingService(KtorServlet.kt:96)
    at io.ktor.server.servlet.KtorServlet.service(KtorServlet.kt:57)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772)
    at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
    at com.google.apphosting.runtime.jetty9.ParseBlobUploadHandler.handle(ParseBlobUploadHandler.java:119)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1182)
    at com.google.apphosting.runtime.jetty9.AppEngineWebAppContext.doHandle(AppEngineWebAppContext.java:183)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at com.google.apphosting.runtime.jetty9.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:296)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
    at org.eclipse.jetty.server.Server.handle(Server.java:539)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:333)
    at com.google.apphosting.runtime.jetty9.RpcConnection.handle(RpcConnection.java:202)
    at com.google.apphosting.runtime.jetty9.RpcConnector.serviceRequest(RpcConnector.java:81)
    at com.google.apphosting.runtime.jetty9.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:123)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchServletRequest(JavaRuntime.java:695)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchRequest(JavaRuntime.java:658)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:628)
    at com.google.apphosting.runtime.JavaRuntime$NullSandboxRequestRunnable.run(JavaRuntime.java:820)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:269)
    at java.lang.Thread.run(Thread.java:748)

这是我的application.conf文件的内容：

ktor {
    application {
        modules = [com.example.MainApplicationKt.main]
    }
}

我已经测试过：

  • 启用计费
  • 从头开始创建新项目
  • 改为使用com.google.firebase：firebase-admin软件包（版本6.7.0）（结果相同）
  • 改为使用数据存储（这似乎工作正常，但是从Firestore切换将需要我移动整个项目并重写很多代码）

1 个答案:

答案 0 :(得分：0)

我在App Engine Flex环境上运行时遇到类似的问题，最终发现Flex提供的默认实例大小（0.6 GB）太小，无法支持Firestore API。因此，在Flex的情况下，我需要调整app.yaml文件，使其包含“资源”部分，如下所示：

resources:
  cpu: 2
  memory_gb: 2.3
  disk_size_gb: 10

有关App Engine灵活部署中的资源设置的参考：https://cloud.google.com/appengine/docs/flexible/custom-runtimes/configuring-your-app-with-app-yaml#resource-settings

对于App Engine Standard，我希望您可能需要通过调整app-engine.xml文件中的“实例类”来做类似的事情。 “ F1”是App Engine标准中的默认实例类，在Java 8运行时中限制为128 MB，在Java 11运行时中限制为256 MB。因此，您可能想尝试移至“ F2”或“ F4”。

有关在App Engine标准Java部署中配置实例类的参考：https://cloud.google.com/appengine/docs/standard/java/config/appref#syntax

有关App Engine实例类的参考：https://cloud.google.com/appengine/docs/standard/#instance_classes

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