public DummyZKFCThread(MiniZKFCCluster _enclosing, MultithreadedTestUtil.TestContext
ctx, DummyHAService svc)
: base(ctx)
{
this._enclosing = _enclosing;
this.zkfc = new MiniZKFCCluster.DummyZKFC(this._enclosing.conf, svc);
}
/// <summary>Test that the ZKFC can gracefully cede its active status.</summary>
/// <exception cref="System.Exception"/>
public virtual void TestCedeActive()
{
try
{
cluster.Start();
MiniZKFCCluster.DummyZKFC zkfc = cluster.GetZkfc(0);
// It should be in active to start.
Assert.Equal(ActiveStandbyElector.State.Active, zkfc.GetElectorForTests
().GetStateForTests());
// Ask it to cede active for 3 seconds. It should respond promptly
// (i.e. the RPC itself should not take 3 seconds!)
ZKFCProtocol proxy = zkfc.GetLocalTarget().GetZKFCProxy(conf, 5000);
long st = Time.Now();
proxy.CedeActive(3000);
long et = Time.Now();
Assert.True("RPC to cedeActive took " + (et - st) + " ms", et -
st < 1000);
// Should be in "INIT" state since it's not in the election
// at this point.
Assert.Equal(ActiveStandbyElector.State.Init, zkfc.GetElectorForTests
().GetStateForTests());
// After the prescribed 3 seconds, should go into STANDBY state,
// since the other node in the cluster would have taken ACTIVE.
cluster.WaitForElectorState(0, ActiveStandbyElector.State.Standby);
long et2 = Time.Now();
Assert.True("Should take ~3 seconds to rejoin. Only took " + (et2
- et) + "ms before rejoining.", et2 - et > 2800);
}
finally
{
cluster.Stop();
}
}
/// <summary>Wait for the given HA service to enter the given HA state.</summary>
/// <remarks>
/// Wait for the given HA service to enter the given HA state.
/// This is based on the state of ZKFC, not the state of HA service.
/// There could be difference between the two. For example,
/// When the service becomes unhealthy, ZKFC will quit ZK election and
/// transition to HAServiceState.INITIALIZING and remain in that state
/// until the service becomes healthy.
/// </remarks>
/// <exception cref="System.Exception"/>
public virtual void WaitForHAState(int idx, HAServiceProtocol.HAServiceState state
)
{
MiniZKFCCluster.DummyZKFC svc = GetZkfc(idx);
while (svc.GetServiceState() != state)
{
ctx.CheckException();
Thread.Sleep(50);
}
}
/// <exception cref="System.Exception"/>
private int RunFC(DummyHAService target, params string[] args)
{
MiniZKFCCluster.DummyZKFC zkfc = new MiniZKFCCluster.DummyZKFC(conf, target);
return(zkfc.Run(args));
}
