我有一个 HTTP 连接池,在运行几个小时后挂起:
private def createHttpPool(host: String): SourceQueue[(HttpRequest, Promise[HttpResponse])] = {
val pool = Http().cachedHostConnectionPoolHttps[Promise[HttpResponse]](host)
Source.queue[(HttpRequest, Promise[HttpResponse])](config.poolBuffer, OverflowStrategy.dropNew)
.via(pool).toMat(Sink.foreach {
case ((Success(res), p)) => p.success(res)
case ((Failure(e), p)) => p.failure(e)
})(Keep.left).run
}
我将项目排队:
private def enqueue(uri: Uri): Future[HttpResponse] = {
val promise = Promise[HttpResponse]
val request = HttpRequest(uri = uri) -> promise
queue.offer(request).flatMap {
case Enqueued => promise.future
case _ => Future.failed(ConnectionPoolDroppedRequest)
}
}
并像这样解决响应:
private def request(uri: Uri): Future[HttpResponse] = {
def retry = {
Thread.sleep(config.dispatcherRetryInterval)
logger.info(s"retrying")
request(uri)
}
logger.info("req-start")
for {
response <- enqueue(uri)
_ = logger.info("req-end")
finalResponse <- response.status match {
case TooManyRequests => retry
case OK => Future.successful(response)
case _ => response.entity.toStrict(10.seconds).map(s => throw Error(s.toString, uri.toString))
}
} yield finalResponse
}
如果 Future 成功,则该函数的结果总是会被转换:
def get(uri: Uri): Future[Try[JValue]] = {
for {
response <- request(uri)
json <- Unmarshal(response.entity).to[Try[JValue]]
} yield json
}
一切工作正常一段时间,然后我在日志中看到的只是 req-start 而没有 req-end。
我的akka配置是这样的:
akka {
actor.deployment.default {
dispatcher = "my-dispatcher"
}
}
my-dispatcher {
type = Dispatcher
executor = "fork-join-executor"
fork-join-executor {
parallelism-min = 256
parallelism-factor = 128.0
parallelism-max = 1024
}
}
akka.http {
host-connection-pool {
max-connections = 512
max-retries = 5
max-open-requests = 16384
pipelining-limit = 1
}
}
我不确定这是配置问题还是代码问题。我的并行度和连接数如此之高,因为没有它,我的请求/秒速率非常差(我想尽可能快地请求 - 我有其他速率限制代码来保护服务器)。