/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
/// <exception cref="Org.Apache.Hadoop.Yarn.Exceptions.YarnException"/>
private void Failover()
{
int activeRMIndex = cluster.GetActiveRMIndex();
cluster.StopResourceManager(activeRMIndex);
NUnit.Framework.Assert.AreEqual("Failover failed", (activeRMIndex + 1) % 2, cluster
.GetActiveRMIndex());
cluster.RestartResourceManager(activeRMIndex);
}