问题描述:
当使用Kubernetes HorizontalPodAutoscaler来调整Akka应用程序的大小时,应用程序似乎无法进行缩放,它仍然在使用先前配置的数量的Pods。这可能是因为Akka自己的快速缩放逻辑和Kubernetes HorizontalPodAutoscaler的缩放逻辑冲突所导致的。
解决方案:
1.配置Kubernetes HorizontalPodAutoscaler
首先,从Kubernetes HorizontalPodAutoscaler手册中获取正确的配置以保持伸缩程序正常工作。在此示例中,将副本数设置为目标CPU使用率的50%。
apiVersion: autoscaling/v1
kind: HorizontalPodAutoscaler
metadata:
name: akka-hpa
spec:
maxReplicas: 10
minReplicas: 1
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: akka-deployment
targetCPUUtilizationPercentage: 50
2.配置Akka快速扩展
在application.conf文件中添加以下设置:
# Akka will adjust its dispatchers to match the number of cores available on the machine running the application
akka.actor.default-dispatcher {
type = "Dispatcher"
executor = "fork-join-executor"
fork-join-executor {
parallelism-min = 2
parallelism-factor = 0.5
parallelism-max = 10
}
# This ensures that all parts of the application will wait for termination of the Akka dispatchers before shutting down
shutdown-timeout = 300s
}
# This will disable auto-downscaling of the Akka actor system
akka.cluster.auto-down-unreachable-after = off
这将允许Akka根据可用于运行应用程序的机器上的核心数量调整其调度程序,并禁用Akka演员系统的自动缩小。
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