我们为短信、电子邮件和推送通知创建了一个 Akka 集群基础设施。系统中存在三种不同类型的节点，分别是客户端、发送者和灯塔。Web 应用程序和 API 应用程序正在使用客户端角色（Web 和 API 托管在 IIS 上）。Lighthouse 和 Sender 角色作为 Windows 服务托管。我们还在发件人角色中运行另外 4 个相同 Windows 服务的控制台应用程序。
大约 2 周以来，我们的 Web 服务器一直在遇到端口耗尽问题。我们的 Web 服务器开始快速消耗端口，一段时间后我们无法执行任何 SQL 操作。有时我们别无选择，只能重置 iis。如果有多个节点处于发送者角色，则会出现此问题。我们对其进行了诊断并找到了问题的根源。
---------------
HOST OPEN WAIT
SRV_NOTIFICATION 3429 0
SRV_LOCAL 198 0
SRV_UNDEFINED_IPV4 23 0
SRV_DATABASE 15 0
SRV_AUTH 4 0
SRV_API 6 0
SRV_UNDEFINED_IPV6 19 0
SRV_INBOUND 12347 5
TotalPortsInUse : 17286
MaxUserPorts : 64510
TcpTimedWaitDelay : 30
03/23/2017 09:30:10
---------------
SRV_NOTIFICATION 是灯塔 ve 发送者节点运行的服务器。SRV_INBOUND 是我们的 Web 服务器。检查此表后，我们检查了 Web 服务器上分配了哪些端口。我们得到了如下表所示的结果。在 netstat 中有超过 12000 个这样的连接：
TCP 192.168.1.10:65531 192.168.1.10:3564 ESTABLISHED 5716 [w3wp.exe]
TCP 192.168.1.10:65532 192.168.1.101:17527 ESTABLISHED 5716 [w3wp.exe]
TCP 192.168.1.10:65533 192.168.1.101:17527 ESTABLISHED 5716 [w3wp.exe]
TCP 192.168.1.10:65534 192.168.1.10:3564 ESTABLISHED 5716 [w3wp.exe]
192.168.1.10 Web 服务器 192.168.1.10:3564 API 192.168.1.101:17527 灯塔
连接正在打开但未关闭。
部署后，我们的 Web 和 Api 应用程序将离开并重新加入集群，并为固定端口配置。我们正在使用@cgstevens 创建的应用程序监控我们的集群。即使我们为 Actor System 实现了 grecaful 关闭逻辑，有时 WEB 和 API 应用程序无法离开集群，因此我们必须手动删除节点并重新启动 Actor 系统。
我们已经在我们的开发环境中重现了这个问题，并在下面录制了一个视频
https://drive.google.com/file/d/0B5ZNfLACId3jMWUyOWliMUhNWTQ/view
我们对节点的 hocon 配置如下：
网页和 API
<akka>
<hocon><![CDATA[
akka{
loglevel = DEBUG
actor{
provider = "Akka.Cluster.ClusterActorRefProvider, Akka.Cluster"
deployment {
/coordinatorRouter {
router = round-robin-group
routees.paths = ["/user/NotificationCoordinator"]
cluster {
enabled = on
max-nr-of-instances-per-node = 1
allow-local-routees = off
use-role = sender
}
}
/decidingRouter {
router = round-robin-group
routees.paths = ["/user/NotificationDeciding"]
cluster {
enabled = on
max-nr-of-instances-per-node = 1
allow-local-routees = off
use-role = sender
}
}
}
serializers {
wire = "Akka.Serialization.HyperionSerializer, Akka.Serialization.Hyperion"
}
serialization-bindings {
"System.Object" = wire
}
debug{
receive = on
autoreceive = on
lifecycle = on
event-stream = on
unhandled = on
}
}
remote {
helios.tcp {
transport-class = "Akka.Remote.Transport.Helios.HeliosTcpTransport, Akka.Remote"
applied-adapters = []
transport-protocol = tcp
hostname = "192.168.1.10"
port = 3564
}
}
cluster {
seed-nodes = ["akka.tcp://notificationSystem@192.168.1.101:17527"]
roles = [client]
}
}
]]>
</hocon>
</akka>
灯塔
<akka>
<hocon>
<![CDATA[
lighthouse{
actorsystem: "notificationSystem"
}
akka {
actor {
provider = "Akka.Cluster.ClusterActorRefProvider, Akka.Cluster"
serializers {
wire = "Akka.Serialization.HyperionSerializer, Akka.Serialization.Hyperion"
}
serialization-bindings {
"System.Object" = wire
}
}
remote {
log-remote-lifecycle-events = DEBUG
helios.tcp {
transport-class = "Akka.Remote.Transport.Helios.HeliosTcpTransport, Akka.Remote"
applied-adapters = []
transport-protocol = tcp
#will be populated with a dynamic host-name at runtime if left uncommented
#public-hostname = "192.168.1.100"
hostname = "192.168.1.101"
port = 17527
}
}
loggers = ["Akka.Logger.NLog.NLogLogger,Akka.Logger.NLog"]
cluster {
seed-nodes = ["akka.tcp://notificationSystem@192.168.1.101:17527"]
roles = [lighthouse]
}
}
]]>
</hocon>
</akka>
发件人
<akka>
<hocon><![CDATA[
akka{
# stdout-loglevel = DEBUG
loglevel = DEBUG
# log-config-on-start = on
loggers = ["Akka.Logger.NLog.NLogLogger, Akka.Logger.NLog"]
actor{
debug {
# receive = on
# autoreceive = on
# lifecycle = on
# event-stream = on
# unhandled = on
}
provider = "Akka.Cluster.ClusterActorRefProvider, Akka.Cluster"
serializers {
wire = "Akka.Serialization.HyperionSerializer, Akka.Serialization.Hyperion"
}
serialization-bindings {
"System.Object" = wire
}
deployment{
/NotificationCoordinator/LoggingCoordinator/DatabaseActor{
router = round-robin-pool
resizer{
enabled = on
lower-bound = 3
upper-bound = 5
}
}
/NotificationDeciding/NotificationDecidingWorkerActor{
router = round-robin-pool
resizer{
enabled = on
lower-bound = 3
upper-bound = 5
}
}
/ScheduledNotificationCoordinator/SendToProMaster/JobToProWorker{
router = round-robin-pool
resizer{
enabled = on
lower-bound = 3
upper-bound = 5
}
}
}
}
remote{
log-remote-lifecycle-events = DEBUG
log-received-messages = on
helios.tcp{
transport-class = "Akka.Remote.Transport.Helios.HeliosTcpTransport, Akka.Remote"
applied-adapters = []
transport-protocol = tcp
#will be populated with a dynamic host-name at runtime if left uncommented
#public-hostname = "POPULATE STATIC IP HERE"
hostname = "192.168.1.101"
port = 0
}
}
cluster {
seed-nodes = ["akka.tcp://notificationSystem@192.168.1.101:17527"]
roles = [sender]
}
}
]]></hocon>
</akka>
集群监视器
<akka>
<hocon>
<![CDATA[
akka {
stdout-loglevel = INFO
loglevel = INFO
log-config-on-start = off
actor {
provider = "Akka.Remote.RemoteActorRefProvider, Akka.Remote"
serializers {
wire = "Akka.Serialization.HyperionSerializer, Akka.Serialization.Hyperion"
}
serialization-bindings {
"System.Object" = wire
}
deployment {
/clustermanager {
dispatcher = akka.actor.synchronized-dispatcher
}
}
}
remote {
log-remote-lifecycle-events = INFO
log-received-messages = off
log-sent-messages = off
helios.tcp {
transport-class = "Akka.Remote.Transport.Helios.HeliosTcpTransport, Akka.Remote"
applied-adapters = []
transport-protocol = tcp
#will be populated with a dynamic host-name at runtime if left uncommented
#public-hostname = "127.0.0.1"
hostname = "192.168.1.101"
port = 0
}
}
cluster {
seed-nodes = ["akka.tcp://notificationSystem@192.168.1.101:17527"]
roles = [ClusterManager]
client {
initial-contacts = ["akka.tcp://notificationSystem@192.168.1.101:17527/system/receptionist"]
}
}
}
]]>
</hocon>
</akka>