micronaut - GraalVM 原生镜像 jvm 指标

Question

运行 Micronaut 应用程序的 native 镜像时，检索 Prometheus 指标失败，因为它无法获取 jvm 指标。

当然 native-image预编译应用程序并仅包含实际使用的内容，但是在运行 native 镜像时使用哪种 JVM？我认为它也是标准热点 vm 的大大简化版本。

那么在运行 native 镜像时甚至可以获取 jvm 指标，还是应该使用其他方法来检索正在运行的应用程序的 cpu 和内存统计信息？

在这种情况下，我使用了 Micronaut，但我认为从任何具有 prometheus 指标的 native 镜像应用程序中获取指标是很常见的。

重现:

- install Micronaut cli (e.g. via Homebrew on Mac)
- install GraalVM 19.2.0 (e.g. via Sdkman on Mac)
- install GraalVM native-image tool: gu install native-image
- create application: mn create-app --features=management,micrometer-prometheus,graal-native-image --build maven metrics-graalvm-image
- update src/main/resources/application.yml to allow anonymous access to prometheus endpoint:

endpoints:
  all:
    enabled: true
    sensitive: false

- run application: man exec:exec
- check prometheus metrics can be retrieved: open http://localhost:8080/prometheus
- build application: mvn clean verify
- create native image: native-image --no-server -jar target/metrics-graalvm-image-0.1.jar
- run native image: ./metrics-graalvm-image
- get prometheus metrics: open http://localhost:8080/prometheus

不使用 native 图像，会引发此异常:

11:06:51.186 [pool-2-thread-4] ERROR i.m.h.s.netty.RoutingInBoundHandler - Unexpected error occurred: ThreadMXBean methods
com.oracle.svm.core.jdk.UnsupportedFeatureError: ThreadMXBean methods
    at com.oracle.svm.core.util.VMError.unsupportedFeature(VMError.java:102)
    at com.oracle.svm.core.jdk.SubstrateThreadMXBean.getAllThreadIds(ManagementSupport.java:448)
    at io.micrometer.core.instrument.binder.jvm.JvmThreadMetrics.getThreadStateCount(JvmThreadMetrics.java:85)
    at io.micrometer.core.instrument.binder.jvm.JvmThreadMetrics.lambda$bindTo$0(JvmThreadMetrics.java:75)
    at io.micrometer.core.instrument.internal.DefaultGauge.value(DefaultGauge.java:40)
    at io.micrometer.prometheus.PrometheusMeterRegistry.lambda$newGauge$3(PrometheusMeterRegistry.java:245)
    at io.micrometer.prometheus.MicrometerCollector.collect(MicrometerCollector.java:69)
    at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.findNextElement(CollectorRegistry.java:183)
    at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:216)
    at io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:137)
    at io.prometheus.client.exporter.common.TextFormat.write004(TextFormat.java:22)
    at io.micrometer.prometheus.PrometheusMeterRegistry.scrape(PrometheusMeterRegistry.java:95)
    at io.micrometer.prometheus.PrometheusMeterRegistry.scrape(PrometheusMeterRegistry.java:80)
    at io.micronaut.configuration.metrics.micrometer.prometheus.management.PrometheusEndpoint.scrape(PrometheusEndpoint.java:52)
    at io.micronaut.configuration.metrics.micrometer.prometheus.management.$PrometheusEndpointDefinition$$exec1.invokeInternal(Unknown Source)
    at io.micronaut.context.AbstractExecutableMethod.invoke(AbstractExecutableMethod.java:144)
    at io.micronaut.context.DefaultBeanContext$BeanExecutionHandle.invoke(DefaultBeanContext.java:2792)
    at io.micronaut.web.router.AbstractRouteMatch.execute(AbstractRouteMatch.java:235)
    at io.micronaut.web.router.RouteMatch.execute(RouteMatch.java:122)
    at io.micronaut.http.server.netty.RoutingInBoundHandler.lambda$buildResultEmitter$19(RoutingInBoundHandler.java:1408)
    at io.reactivex.internal.operators.flowable.FlowableCreate.subscribeActual(FlowableCreate.java:71)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.Flowable.subscribe(Flowable.java:14865)
    at io.micronaut.reactive.rxjava2.RxInstrumentedFlowable.subscribeActual(RxInstrumentedFlowable.java:68)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.internal.operators.flowable.FlowableMap.subscribeActual(FlowableMap.java:37)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.Flowable.subscribe(Flowable.java:14865)
    at io.micronaut.reactive.rxjava2.RxInstrumentedFlowable.subscribeActual(RxInstrumentedFlowable.java:68)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.internal.operators.flowable.FlowableSwitchIfEmpty.subscribeActual(FlowableSwitchIfEmpty.java:32)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.Flowable.subscribe(Flowable.java:14865)
    at io.micronaut.reactive.rxjava2.RxInstrumentedFlowable.subscribeActual(RxInstrumentedFlowable.java:68)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.Flowable.subscribe(Flowable.java:14868)
    at io.micronaut.http.context.ServerRequestTracingPublisher.lambda$subscribe$0(ServerRequestTracingPublisher.java:52)
    at io.micronaut.http.context.ServerRequestContext.with(ServerRequestContext.java:52)
    at io.micronaut.http.context.ServerRequestTracingPublisher.subscribe(ServerRequestTracingPublisher.java:52)
    at io.micronaut.configuration.metrics.binder.web.WebMetricsPublisher.subscribe(WebMetricsPublisher.java:122)
    at io.reactivex.internal.operators.flowable.FlowableFromPublisher.subscribeActual(FlowableFromPublisher.java:29)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.Flowable.subscribe(Flowable.java:14865)
    at io.micronaut.reactive.rxjava2.RxInstrumentedFlowable.subscribeActual(RxInstrumentedFlowable.java:68)
    at io.reactivex.Flowable.subscribe(Flowable.java:14918)
    at io.reactivex.Flowable.subscribe(Flowable.java:14865)
    at io.reactivex.internal.operators.flowable.FlowableSubscribeOn$SubscribeOnSubscriber.run(FlowableSubscribeOn.java:82)
    at io.reactivex.internal.schedulers.ExecutorScheduler$ExecutorWorker$BooleanRunnable.run(ExecutorScheduler.java:288)
    at io.reactivex.internal.schedulers.ExecutorScheduler$ExecutorWorker.run(ExecutorScheduler.java:253)
    at io.micrometer.core.instrument.composite.CompositeTimer.record(CompositeTimer.java:79)
    at io.micrometer.core.instrument.Timer.lambda$wrap$0(Timer.java:144)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
    at com.oracle.svm.core.thread.JavaThreads.threadStartRoutine(JavaThreads.java:460)
    at com.oracle.svm.core.posix.thread.PosixJavaThreads.pthreadStartRoutine(PosixJavaThreads.java:193)

Answer 1

GraalVM native-image在独立的可执行文件中使用 基板虚拟机 - 部分虚拟机。

您可以在其官方 GitHub 存储库 here 上找到有关它的更多详细信息。 .

另外根据 SubstrateVM limitations document ，不支持Java提供的标准管理和调试接口(interface)。这是因为它们需要访问在运行时不再可用的 Java 字节码，以防原生镜像。