[Q] How to change node state via SDK?

[typhoon2k]

Hey,

I couldn't find any example, therefore asking it here - what is the recommended way of changing HPC node state via SDK?
We can get a node via IScheduler's OpenNodeByName(String), but resulting ISchedulerNode doesn't provide any APIs for changing state.
Also, there's no API for changing node state in IScheduler...

ty

[weshinsley]

node.exe in the command-line client tools has ways of setting nodes to "online" or "offline" - so shelling out would be a (fairly ugly ) workaround.

I thought (from some earlier errors I saw) that node.exe is compiled C# - perhaps using the SDK? - which makes me think there should be a way of doing this. But I'd also be interested to know how - if an SDK method exists, it is not easy to find.

[YutongSun]

@typhoon2k @weshinsley , may use the NodeQuery class in Microsoft.Hpc.Scheduler.NodeManagement.dll to bring nodes online/offline. E.g.

using (NodeQuery nodequery = HpcContext.GetOrAdd(scheduler, CancellationToken.None).GetNodeQueryAsync().GetAwaiter().GetResult())
{
if (nodeName != null)
{
verifyValidNode(scheduler, nodeName);
}

try
{
    nodequery.TakeNodeOnline(nodeName, false);
}
catch (Exception)
{
    Console.Error.WriteLine(Resources.NodeState_ErrorInvalidNodeState);
    Environment.ExitCode = 1;
    return;
}

}

[typhoon2k]

Thanks @YutongSun !