/// <summary>Try to get the HA state of the node at the given address.</summary>
/// <remarks>
/// Try to get the HA state of the node at the given address. This
/// function is guaranteed to be "quick" -- ie it has a short timeout
/// and no retries. Its only purpose is to avoid fencing a node that
/// has already restarted.
/// </remarks>
internal virtual bool TryGracefulFence(HAServiceTarget svc)
{
HAServiceProtocol proxy = null;
try
{
proxy = svc.GetProxy(gracefulFenceConf, gracefulFenceTimeout);
proxy.TransitionToStandby(CreateReqInfo());
return(true);
}
catch (ServiceFailedException sfe)
{
Log.Warn("Unable to gracefully make " + svc + " standby (" + sfe.Message + ")");
}
catch (IOException ioe)
{
Log.Warn("Unable to gracefully make " + svc + " standby (unable to connect)", ioe
);
}
finally
{
if (proxy != null)
{
RPC.StopProxy(proxy);
}
}
return(false);
}
/// <exception cref="System.IO.IOException"/>
public static void TransitionToStandby(HAServiceProtocol svc, HAServiceProtocol.StateChangeRequestInfo
reqInfo)
{
try
{
svc.TransitionToStandby(reqInfo);
}
catch (RemoteException e)
{
throw e.UnwrapRemoteException(typeof(ServiceFailedException));
}
}