How do I use Apache Ignite from two or more IIS applications

问题

I am new to Apache Ignite and trying to use Ignite within IIS websites and WCF services. My test case involves two IIS hosted WCF test services on one PC. I am instantiating Ignite in either of the two IIS applications and then trying to access from the other. So far this has not worked. Once Ignite starts in one IIS app, I get a "Default grid instance has already been started" from the other app, but the other app is not able to get a handle of the existing default grid instance.

I am running the code below from the Global.asax Application_Start of both IIS test applications. Hoping someone can give insight and point me in the right direction:

Random random = new Random();
short startCounter = 0;
Stopwatch sw = new Stopwatch();
sw.Start();
do
{
    Thread.Sleep( 1000 * random.Next( 10, 20 ) );
    IgniteEngine = Ignition.TryGetIgnite();
    startCounter++;
    if ( null == IgniteEngine )
    {
        LogHelper.Write( "{0}: CacheManager.InitializeCache attempt {1} to get a new ignite instance failed.".InvariantFormat( CommonSystemInfo.MachineName, startCounter ), "TraceLogger" );
    }

    if ( null == IgniteEngine )
    {
        try
        {
            IgniteEngine = Ignition.Start( new IgniteConfiguration
            {
                JvmClasspath = System.IO.Directory.GetFiles( System.Web.HttpContext.Current.Server.MapPath( @"~\bin\libs" ) ).Aggregate( ( x, y ) => x + ";" + y )
            } );
            if ( null != IgniteEngine )
            {
                LogHelper.Write( "{0}: CacheManager.InitializeCache success starting ignite after {1} attempts and {2} seconds".InvariantFormat( CommonSystemInfo.MachineName, startCounter, sw.Elapsed.TotalSeconds ), "TraceLogger" );
            }
        }
        catch ( Exception ex2 )
        {
            LogHelper.Write( "{0}: CacheManager.InitializeCache error while trying to start a new ignite instance. {1}".InvariantFormat( CommonSystemInfo.MachineName, ex2.GetAllMessages() ), "TraceLogger" );
        }
    }
}
while ( null == IgniteEngine && sw.Elapsed.TotalMinutes <= 2 );

回答1:

Looks like your services run within one IIS Application Pool, which means one process and different app domains. This means that there is a single JVM within the process, which causes Default grid instance has already been started error.

Your options are:

Use different IgniteConfiguration.GridName
Assign different IIS Application Pool to one of the services
Run both services within one application so that TryGetIgnite works and you don't have to start Ignite twice

来源：https://stackoverflow.com/questions/41363060/how-do-i-use-apache-ignite-from-two-or-more-iis-applications

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ASP.NET

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