Selenium 4 - Hub switches its state to "ready: false"

[evertones]

🐛 Bug Report

I am trying to run a suite of tests with Scala, ScalaTest and Selenium 4.
When I start more tests than the number of Selenium nodes I have available, I get an exception.
After the exception is thrown, if I access the hub URL http://localhost:4444/status ii shows the state of the hub as ready: false. The state of the nodes looks alright.

Below the exception received

*** RUN ABORTED *** (1 minute, 3 seconds)
  java.lang.ExceptionInInitializerError:
  at org.evertones.test.SuiteWith16Tests.<init>(SuiteWith16Tests.scala:28)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
  at java.lang.Class.newInstance(Class.java:442)
  at org.scalatest.tools.Runner$.genSuiteConfig(Runner.scala:1428)
  at org.scalatest.tools.Runner$.$anonfun$doRunRunRunDaDoRunRun$8(Runner.scala:1236)
  at scala.collection.immutable.List.map(List.scala:283)
  at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:1235)
  ...
  Cause: org.openqa.selenium.remote.UnreachableBrowserException: Could not start a new session. Possible causes are invalid address of the remote server or browser start-up failure.
Build info: version: '4.0.0-alpha-7', revision: 'de8579b6d5'
System info: host: 'everton-pc', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '5.3.0-40-generic', java.version: '1.8.0_275'
Driver info: driver.version: RemoteWebDriver
  at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:522)
  at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:207)
  at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:127)
  at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:140)
  at org.evertones.selenium.WebDriverFactory.createRemoteInstance(WebDriverFactory.scala:16)
  at org.evertones.test.Selenium4Spec.<init>(Selenium4Spec.scala:15)
  at org.evertones.test.SuiteWith16Tests$.<init>(SuiteWith16Tests.scala:16)
  at org.evertones.test.SuiteWith16Tests$.<clinit>(SuiteWith16Tests.scala)
  at org.evertones.test.SuiteWith16Tests.<init>(SuiteWith16Tests.scala:28)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  ...
  Cause: java.lang.RuntimeException: NettyHttpHandler request execution error
  at org.openqa.selenium.remote.http.netty.NettyHttpHandler.makeCall(NettyHttpHandler.java:72)
  at org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)
  at org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)
  at org.openqa.selenium.remote.http.netty.NettyHttpHandler.execute(NettyHttpHandler.java:47)
  at org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)
  at org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)
  at org.openqa.selenium.remote.http.netty.NettyClient.execute(NettyClient.java:60)
  at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:105)
  at org.openqa.selenium.remote.ProtocolHandshake.createSession(ProtocolHandshake.java:75)
  at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:139)
  ...
  Cause: java.util.concurrent.ExecutionException: java.util.concurrent.TimeoutException: Request timeout to localhost/127.0.0.1:4444 after 60000 ms
  at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
  at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908)
  at org.asynchttpclient.netty.NettyResponseFuture.get(NettyResponseFuture.java:201)
  at org.openqa.selenium.remote.http.netty.NettyHttpHandler.makeCall(NettyHttpHandler.java:57)
  at org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)
  at org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)
  at org.openqa.selenium.remote.http.netty.NettyHttpHandler.execute(NettyHttpHandler.java:47)
  at org.openqa.selenium.remote.http.AddSeleniumUserAgent.lambda$apply$0(AddSeleniumUserAgent.java:42)
  at org.openqa.selenium.remote.http.Filter.lambda$andFinally$1(Filter.java:56)
  at org.openqa.selenium.remote.http.netty.NettyClient.execute(NettyClient.java:60)
  ...
  Cause: java.util.concurrent.TimeoutException: Request timeout to localhost/127.0.0.1:4444 after 60000 ms
  at org.asynchttpclient.netty.timeout.TimeoutTimerTask.expire(TimeoutTimerTask.java:43)
  at org.asynchttpclient.netty.timeout.RequestTimeoutTimerTask.run(RequestTimeoutTimerTask.java:50)
  at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:672)
  at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:747)
  at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:472)
  at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
  at java.lang.Thread.run(Thread.java:748)
  ...

> Task :test FAILED

FAILURE: Build failed with an exception.

Below the output when accessed http://localhost:4444/status

{
  "value": {
    "ready": false,
    "message": "Selenium Grid not ready.",
    "nodes": [
      {
        "id": "55827655-511e-4da7-8414-642a9f7b3f88",
        "uri": "http:\u002f\u002f172.25.0.6:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 126,
                "moz:profile": "\u002ftmp\u002frust_mozprofilewEwB8M",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "52865d83-e9ce-40a9-bdb4-ee771a3110ff",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:46:17.153Z",
              "uri": "http:\u002f\u002flocalhost:29075"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "55827655-511e-4da7-8414-642a9f7b3f88",
              "id": "92d7ffb7-2aeb-473f-8010-399d93ba0c51"
            }
          }
        ],
        "availability": "UP"
      },
      {
        "id": "cdefe0bc-34d7-46e1-a789-3a81b26c8c8e",
        "uri": "http:\u002f\u002f172.25.0.5:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 145,
                "moz:profile": "\u002ftmp\u002frust_mozprofileQzqCgW",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "1c7f5105-c298-4fdf-aa53-1a5130e0de56",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:45:58.162Z",
              "uri": "http:\u002f\u002flocalhost:28420"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "cdefe0bc-34d7-46e1-a789-3a81b26c8c8e",
              "id": "57d078b1-78db-4d85-bfa3-14756a727b73"
            }
          }
        ],
        "availability": "UP"
      },
      {
        "id": "1ee36a5b-093f-4ea8-9a45-3a427d1e5f83",
        "uri": "http:\u002f\u002f172.25.0.8:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 127,
                "moz:profile": "\u002ftmp\u002frust_mozprofile8U9rzw",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "8f8defbc-398f-4c42-b620-5daf65aff006",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:46:11.771Z",
              "uri": "http:\u002f\u002flocalhost:24482"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "1ee36a5b-093f-4ea8-9a45-3a427d1e5f83",
              "id": "2d427496-e0af-432a-8172-e3225d6937ac"
            }
          }
        ],
        "availability": "UP"
      },
      {
        "id": "9c95f9cd-58c6-491f-bb58-0ee9508aa502",
        "uri": "http:\u002f\u002f172.25.0.9:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 127,
                "moz:profile": "\u002ftmp\u002frust_mozprofilekA9gX6",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "73daaee9-5943-4540-81c5-a739ddaa00e9",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:45:53.882Z",
              "uri": "http:\u002f\u002flocalhost:24808"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "9c95f9cd-58c6-491f-bb58-0ee9508aa502",
              "id": "3e54e66e-dca3-4623-8cd0-3050df82f49f"
            }
          }
        ],
        "availability": "UP"
      },
      {
        "id": "5a41a936-8ba2-4df6-adbe-1d006fb20923",
        "uri": "http:\u002f\u002f172.25.0.7:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 146,
                "moz:profile": "\u002ftmp\u002frust_mozprofileLSKslW",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "a09e9f89-5819-4dfb-9bd7-0fd1f91601d7",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:46:23.389Z",
              "uri": "http:\u002f\u002flocalhost:3067"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "5a41a936-8ba2-4df6-adbe-1d006fb20923",
              "id": "36cbe8bf-317b-4642-8e08-8b4709db514f"
            }
          }
        ],
        "availability": "UP"
      },
      {
        "id": "91bdd298-6101-4174-9a55-d3128455286c",
        "uri": "http:\u002f\u002f172.25.0.3:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 144,
                "moz:profile": "\u002ftmp\u002frust_mozprofile4L1hK2",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "347932c0-b1d2-4d8b-8132-1aefade06abc",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:45:44.973Z",
              "uri": "http:\u002f\u002flocalhost:10320"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "91bdd298-6101-4174-9a55-d3128455286c",
              "id": "cf132e13-7e15-40bb-afb2-5e2fc6132b1b"
            }
          }
        ],
        "availability": "UP"
      },
      {
        "id": "0cd8e479-de20-43b7-adcf-3ba10ab6c405",
        "uri": "http:\u002f\u002f172.25.0.10:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 145,
                "moz:profile": "\u002ftmp\u002frust_mozprofileBJIsnP",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "5ee0ef73-add2-41e6-88aa-216d4d4082e2",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:46:06.885Z",
              "uri": "http:\u002f\u002flocalhost:4424"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "0cd8e479-de20-43b7-adcf-3ba10ab6c405",
              "id": "733cbc04-4529-4210-8e5c-818f4724d0a6"
            }
          }
        ],
        "availability": "UP"
      },
      {
        "id": "dde398ff-c8cc-4e60-855d-a4c3a3d542c9",
        "uri": "http:\u002f\u002f172.25.0.4:5555",
        "maxSessions": 1,
        "slots": [
          {
            "lastStarted": "1970-01-01T00:00:00Z",
            "session": {
              "capabilities": {
                "acceptInsecureCerts": true,
                "browserName": "firefox",
                "browserVersion": "83.0",
                "moz:accessibilityChecks": false,
                "moz:buildID": "20201112153044",
                "moz:geckodriverVersion": "0.28.0",
                "moz:headless": false,
                "moz:processID": 145,
                "moz:profile": "\u002ftmp\u002frust_mozprofiley0PnSU",
                "moz:shutdownTimeout": 60000,
                "moz:useNonSpecCompliantPointerOrigin": false,
                "moz:webdriverClick": true,
                "pageLoadStrategy": "normal",
                "platformName": "linux",
                "platformVersion": "5.4.39-linuxkit",
                "rotatable": false,
                "setWindowRect": true,
                "strictFileInteractability": false,
                "timeouts": {
                  "implicit": 0,
                  "pageLoad": 300000,
                  "script": 30000
                },
                "unhandledPromptBehavior": "dismiss and notify"
              },
              "sessionId": "7af81ed5-551b-428c-b00f-9321e8412cca",
              "stereotype": {
                "browserName": "firefox"
              },
              "start": "2020-12-19T04:46:02.012Z",
              "uri": "http:\u002f\u002flocalhost:4380"
            },
            "stereotype": {
              "browserName": "firefox"
            },
            "id": {
              "hostId": "dde398ff-c8cc-4e60-855d-a4c3a3d542c9",
              "id": "ca1de0c0-6d04-44d5-b32e-64f52513cb8f"
            }
          }
        ],
        "availability": "UP"
      }
    ]
  }
}

I've tried this with both Chrome and Firefox.

To Reproduce

I have created a repository in Github to reproduce the issue.
More details below in the section Test script reproducing this issue (when applicable).

Here's the docker-compose.yml file to start the containers.

version: "3"

services:
  selenium-hub:
    image: selenium/hub:4.0.0-beta-1-prerelease-20201208
    container_name: selenium-hub
    ports:
      - "4442:4442"
      - "4443:4443"
      - "4444:4444"
    environment:
      - JAVA_OPTS=-Xms2g -Xmx8g

  chrome:
    image: selenium/node-chrome:4.0.0-beta-1-prerelease-20201208
    volumes:
      - /dev/shm:/dev/shm
    depends_on:
      - selenium-hub
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443

  firefox:
    image: selenium/node-firefox:4.0.0-beta-1-prerelease-20201208
    volumes:
      - /dev/shm:/dev/shm
    depends_on:
      - selenium-hub
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443

The command:

docker-compose up -d --scale chrome=8

OR

docker-compose up -d --scale firefox=8

Expected behavior

When the tests I want to run are executed, I would expect that all of them would run without errors like the exception mentioned in the bug report section.

If any error happens, I would expect to see in the container LOGs, but nothing is reported there.
I try to check it by running docker-compose logs and cannot find any error.

Test script reproducing this issue (when applicable)

I have created a repository in Github where it's easy to reproduce the error.
I could reproduce on a Mac and on a Linux with Ubuntu.

The steps to reproduce:

• clone the repo from https://github.com/evertones/selenium4-scala.git
• start docker from the folder docker using the command docker-compose up -d --scale chrome=8
• start the test from the root of the project using the command ./gradlew clean test -Ptest.suite=SuiteWith8Tests
  • this should PASS
• start the test from the root of the project using the command ./gradlew clean test -Ptest.suite=SuiteWith16Tests
  • this should FAIL with the exception mentioned in the bug report section

Environment

OS: OSX Mojare 10.14.6 AND Ubuntu 18.04.3 LTS (reproduced in both)
Docker-Selenium image version: 4.0.0-beta-1-prerelease-20201208
Also provide the docker image id:

REPOSITORY                    TAG                                IMAGE ID            CREATED             SIZE
selenium/node-firefox         4.0.0-beta-1-prerelease-20201208   e4e8321ff65b        10 days ago         893MB
selenium/node-chrome          4.0.0-beta-1-prerelease-20201208   ec32fe614b4c        10 days ago         959MB
selenium/hub                  4.0.0-beta-1-prerelease-20201208   0bdb0e2f0ead        10 days ago         275MB

Docker version:

• Mac: 19.03.13
• Linux: 18.09.0

Docker-Compose version (if applicable):

• Mac: 1.27.4
• Linux: 1.25.4

Exact Docker command to start the containers (if using docker-compose, provide
the docker-compose file as well):

• docker-compose up -d --scale chrome=8 (docker-compose was attached above)

[diemol]

Could you please share the docker compose logs?

[evertones]

@diemol : I'm attaching a file with the logs.
After reading it through again, I could see just one error:

chrome_1        | [1608521725.164][SEVERE]: bind() failed: Cannot assign requested address (99)

logs.txt

[diemol]

@evertones , are you still seeing this issue with the most recent tag?
https://github.com/SeleniumHQ/docker-selenium/releases/tag/4.0.0-beta-1-20210215

[evertones]

@diemol: I just tested with the latest tag and it is still an issue.

It's weird that if I run 8 tests in parallel, where my machine has 8 cores, it works.
If I ran 16 tests in parallel, where my machine has 8 cores, it fails.

I can see this on LOGs:

 evertons@everton-pc  ~/selenium4  docker-compose logs | grep "Cannot assign requested addres"
chrome_2        | 03.851][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_4        | [1614646102.851][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_5        | [1614645871.917][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_5        | [1614646100.847][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_3        | [1614645875.917][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_3        | [1614646104.850][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_7        | [1614646099.853][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_7        | [1614646411.848][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_1        | [1614646105.853][SEVERE]: bind() failed: Cannot assign requested address (99)
chrome_8        | ) failed: Cannot assign requested address (99)
chrome_6        |  bind() failed: Cannot assign requested address (99)
 evertons@everton-pc  ~/selenium4 

[diemol]

But is the issue of the hub switching to "ready: false" is gone?

This message:

03.851][SEVERE]: bind() failed: Cannot assign requested address (99)

as you can see in other issues, is logged from ChromeDriver, and it normally does not affect your tests.

[evertones]

@diemol : Yes, the issue of the hub switching to "ready: false" is still happening.
I uploaded a video to Youtube to show it:

• https://youtu.be/fzkp_41VljA

Like I mentioned in the issue description, the code to reproduce it can be found in a repo I created:

• https://github.com/evertones/selenium4-scala

[diemol]

Ok, I had to read the whole issue again to understand better what was going on:

• ready: false in the status means either:
  • There was an error while the status of the Nodes was being fetched
  • All slots of the Nodes are used and none of them is ready to receive more requests, which is the case you are having

You were starting 8 Nodes for Firefox or 8 Nodes for Chrome , so when running 16 tests in parallel, there is a moment where no slots are available so ready turns to false.

This logic was written before we had the SessionQueue implemented, so it made sense to have the status as false when it was not possible to queue new session requests.

However, we have the queue now, so I have changed the logic to return true when there are Nodes available. You might still get a false when there is an error while fetching the status but this should not happen if the Grid has enough resources.

This will be available in the next prerelease.