Go unable to poll for changes

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    GoCD unable to poll for changes

    GoCD server polls for changes to all materials of ‘Auto Triggered’ pipelines. By default, polling occurs every minute and ten materials at a time. The polling interval and the number of materials to be polled simultaneously are configurable.

    GoCD uses SCM commands to poll for changes. For example, to check for any new changes in SVN repository the following command is used:

    svn log --non-interactive --xml -v -r HEAD:'revision' 'repository-URL'

    The SCM command used by GoCD server can hang with no output. Invalid configuration, network issues, console input block are some of the causes for such a situation. Such scenarios cause pipeline scheduling delays and also lead to performance degradation

    Such a scenario is notified to the users by a warning in Server Health; when clicked shows a message similar to the one below.

    What can I do with the information

    When you see warning messages like the one above

    • Identify the processes running as children of GoCD Server

      On Windows, you can use tools like Process Explorer . On linux you could run ‘ps waux | grep ‘material-type”

    • Determine the process that’s hung. The extra information like URL: https://test@bitbucket.org/test/git_repo.git in the warning information should help you with this.

    • On linux system, you should see lines like these:

      go 31201 1  0 Feb07 ?  00:00:00 git clone https://test@bitbucket.org/test/git_repo.git /var/lib/cruise-server/pipelines/flyweight/b9ec0885-eb32-458c-bd6b-eeefe3ef9816
    • Kill the process and all its children (the whole process tree).

    • Ensure that the warning message goes away from Server Health.

      Please note the folder name (of the form …/flyweight/b9ec0885-eb32-458c-bd6b-eeefe3ef9816 ) present in the OS process listing. This folder was being used by the polling command. Locate the folder in the GoCD installation and delete it if it exists. This ensures that the kill of the process tree has not left behind any inconsistent information.

    Configuring warning time

    GoCD server waits for 15 minutes (of no output) before it warns user about possible hung material update. User can modify this wait time (in minutes) using a system property material.update.inactive.timeout. This system property can be set in the file wrapper-properties.conf on the GoCD server to add the system properties described above. See the installation documentation for the location of wrapper-properties.conf file.