Quartz.NET, "Error communicating with remote scheduler."

Question

Hi all,

I'm having trouble getting a client/server implementation of Quartz.NET working.

I have a SQL Server on ServerA, a server running Quartz as a service (ServerB) and a server which hosts an ASP.NET application (ServerC).

I have followed all the tutorials and delved into the code a fair amount but I can't see what I'm doing wrong. The server is definitely listening and I can see the port is open from ServerC. No firewalls involved.

ServerB, which is running the service included in the download package (Quartz.Server.Service) has the following config file settings:

<quartz>
    <add key="quartz.server.serviceName" value="quartz" />
    <add key="quartz.server.serviceDisplayName" value="Job Scheduler" />
    <add key="quartz.scheduler.instanceName" value="RemoteServer" />
    <add key="quartz.threadPool.type" value="Quartz.Simpl.SimpleThreadPool, Quartz" />
    <add key="quartz.threadPool.threadCount" value="10" />
    <add key="quartz.threadPool.threadPriority" value="Normal" />
    <add key="quartz.scheduler.exporter.type" value="Quartz.Simpl.RemotingSchedulerExporter, Quartz" />
    <add key="quartz.scheduler.exporter.port" value="5656" />
    <add key="quartz.scheduler.exporter.bindName" value="QuartzScheduler" />
    <add key="quartz.scheduler.exporter.channelType" value="tcp" />
    <add key="quartz.jobStore.type" value="Quartz.Impl.AdoJobStore.JobStoreTX, Quartz" />
    <add key="quartz.jobStore.driverDelegateType" value="Quartz.Impl.AdoJobStore.SqlServerDelegate, Quartz" />
    <add key="quartz.jobStore.tablePrefix" value="qrtz_" />
    <add key="quartz.jobStore.dataSource" value="db" />
    <add key="quartz.dataSource.db.provider" value="SqlServer-20" />
    <add key="quartz.dataSource.db.connectionString" value="Data Source=ServerA;Initial Catalog=dev;User ID=dev;Password=dev" />
    <add key="quartz.jobStore.useProperties" value="true" />
    <add key="quartz.jobStore.lockHandler.type" value="Quartz.Impl.AdoJobStore.UpdateLockRowSemaphore, Quartz" />
</quartz>

The ASP.NET app has the following config:

<quartz>
    <add key="quartz.scheduler.instanceName" value="RemoteClient" />
    <add key="quartz.threadPool.type" value="Quartz.Simpl.SimpleThreadPool, Quartz" />
    <add key="quartz.threadPool.threadCount" value="5" />
    <add key="quartz.threadPool.threadPriority" value="Normal" />
    <add key="quartz.scheduler.proxy" value="true" />
    <add key="quartz.scheduler.proxy.address" value="tcp://ServerB:5656/QuartzScheduler" />
</quartz>

I have tried numerous things. Occasionally I get an error that the scheduler already exists instead of the one in the question title.

I have read elsewhere that due to threading issues I should create the scheduler in a singleton, which I have done:

    private static readonly ISchedulerFactory _schedulerFactory;
    private static readonly IScheduler _scheduler;

    static JobScheduleService() {
        _schedulerFactory = new StdSchedulerFactory();
        _scheduler = _schedulerFactory.GetScheduler();
    }

    public static IScheduler GetScheduler() {
        return _scheduler;
    }

What have I missed? TIA

---

If I open up a telnet box on the web server and connect to the quartz server then the service is definitely responding. If I type a few characters I get an error from Quartz.

Does this help? I.e. it's not a connectivity issue?

Answer 1

Try NOT setting any of the quartz.threadpool.xxxxxx properties.

Answer 2

It turns out that the error message is just a bit misleading. The error wasn't in the communication with the server at all. The problem was a missing DLL file that wasn't being copied as part of the deployment. The underlying error was due to the schedulers inability to find the DLL.