Inconsistent Selenium Grid Errors

Question

I am running tests on Selenium grid - usually 5 machines running tests in parallel. I am getting some odd errors that aren't consistent. For example, one of my tests with about 600 iterations will finish with 0-50 of the 3 errors below. The number is different every time I run it. For each exception, the line it fails on is always the same.

org.openqa.selenium.UnsupportedCommandException: Command duration or timeout: 65.91 seconds com.web.test.library.BaseTest.openUrl(BaseTest.java:45)

Line #45 in BaseTest: remoteDriver.get(url);
org.openqa.selenium.WebDriverException: Error forwarding the new session Error forwarding the request Read timed out Command duration or timeout: 134.11 seconds com.web.test.utility.DriverFactory.generateDriver(DriverFactory.java:46)

Line #46 in DriverFactory: WebDriver driver = new RemoteWebDriver("my hub url here", capabilities);
org.openqa.selenium.WebDriverException: Unable to bind to locking port 7054 within 45000 ms com.web.test.utility.DriverFactory.generateDriver(DriverFactory.java:46)

Line #46 in DriverFactory: WebDriver driver = new RemoteWebDriver("my hub url here", capabilities);

When I search for these errors online the fixes only help when this error is stopping every test. I can't find anything when it happens inconsistently like this. For example, the fix I found for #1 requires editing the host file. I don't think that is the problem in my case since it works ~95% of the time.

Nathan Merrill · Accepted Answer · 2014-04-11 04:11:23Z

2

I'm guessing you are doing parallel testing using multiple threads.

If that is the case, I would recommend looking at ThreadGuard. It's a lightweight solution to make Webdriver thread safe.

If that doesn't work, then I imagine you are running into a networking overload problem (you are trying to do too many outgoing connections). How to fix such a problem, I don't know.

answered Apr 11, 2014 at 4:11

Nathan Merrill

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3 Comments

Ryan Over a year ago

Thanks, Nathan. I will check that out. You are correct that I am running tests in parallel with multiple threads.

YAAK Over a year ago

@l3v I know long time has past since then, but any chance that you've solved the problem? IS it possible for you to share the solution a little bit?

Ryan Over a year ago

@YAAK I do not have a solution. I don't remember how I got rid of it. If I recall, I think this was happening with FirefoxDriver and I began to mostly use ChromeDriver. I also use ThreadGuard as mentioned above.

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