http-client XTDB2 fails: too many open files.

[jsulmont]

trafficstars

How to reproduce:

(require  '[xtdb.client :as xt.client]
                '[xtdb.api :as xt])

(let [node (xt.client/start-client "http://localhost:3000")]
    (doseq [i (iterate inc 1)]
      (xt/submit-tx node [[:put :users
                           {:xt/id i
                            :user-id (random-uuid)
                            :name "yyeyeyeyeye"}]])
      (when (zero? (mod i 10))
        (prn i))))

producing:

Execution error (SocketException) at sun.nio.ch.Net/socket0 (Net.java:-2).
Too many open files

PS: Darwin sirius.local 23.1.0 Darwin Kernel Version 23.1.0: Mon Oct 9 21:27:24 PDT 2023; root:xnu-10002.41.9~6/RELEASE_ARM64_T6000 arm64

[jsulmont]

Hato wraps Java 11 HTTP client, which uses a configurable connection pool. Setting the following properties:

  (System/setProperty "jdk.httpclient.connectionPoolSize" "10")
  (System/setProperty "jdk.httpclient.keepalive.timeout" "2")

(timeout in seconds) seems to allow the client to handle the script above.