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  1. ZABBIX BUGS AND ISSUES
  2. ZBX-22689

mongodb.ping is using default client timeout

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    • Team INT
    • Sprint 99 (Apr 2023), Sprint 100 (May 2023)
    • 1

      Mongo driver is having multiple timeouts and one of them is
      https://www.mongodb.com/docs/drivers/go/current/fundamentals/connection/

      serverSelectionTimeoutMS
      integer
      30000
      Specifies the number of milliseconds to wait to find an available, suitable server to execute an operation.

      It has a default value of 30 seconds, so it will always try maximum time allowed by Zabbix agent.

      The MongoDB timeout for agent 2 plugin should be configurable or at least smaller than default timeout.

      In the source, part where it is creating connection options
      https://git.zabbix.com/projects/AP/repos/mongodb/browse/plugin/conn.go#300

      We can modify the code to allow the user to manually configure timeout.

      Here is diff of MongoDB plugin which allows to lower down timeout:

      diff --git a/plugin/conn.go b/plugin/conn.go
      index e872a78..7cf65bb 100644
      --- a/plugin/conn.go
      +++ b/plugin/conn.go
      @@ -298,6 +298,7 @@ func (c *ConnManager) createOptions(uri uri.URI, details tlsconfig.Details) (*op
              opt.SetHosts([]string{uri.Addr()})
              opt.SetDirect(true)
              opt.SetConnectTimeout(c.timeout)
      +       opt.SetServerSelectionTimeout(c.timeout)
              opt.SetMaxPoolSize(1)
      
              return opt, nil

      Now we can use:

      Plugins.MongoDB.Timeout=1

      Registering this as a bug report because with existing agent configuration, it's not possible to workaround the issue. The poller which is fetching "mongodb.ping" metric will get stuck.

            esneiders Eriks Sneiders
            aigars.kadikis Aigars Kadikis
            Team INT
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              Created:
              Updated:
              Resolved: