/// <summary>Initiate a graceful failover by talking to the target node's ZKFC.</summary>
/// <remarks>
/// Initiate a graceful failover by talking to the target node's ZKFC.
/// This sends an RPC to the ZKFC, which coordinates the failover.
/// </remarks>
/// <param name="toNode">the node to fail to</param>
/// <returns>status code (0 for success)</returns>
/// <exception cref="System.IO.IOException">if failover does not succeed</exception>
private int GracefulFailoverThroughZKFCs(HAServiceTarget toNode)
{
int timeout = FailoverController.GetRpcTimeoutToNewActive(GetConf());
ZKFCProtocol proxy = toNode.GetZKFCProxy(GetConf(), timeout);
try
{
proxy.GracefulFailover();
@out.WriteLine("Failover to " + toNode + " successful");
}
catch (ServiceFailedException sfe)
{
errOut.WriteLine("Failover failed: " + sfe.GetLocalizedMessage());
return(-1);
}
return(0);
}
/// <exception cref="Org.Apache.Hadoop.HA.ServiceFailedException"/>
private void BecomeActive()
{
lock (this)
{
Log.Info("Trying to make " + localTarget + " active...");
try
{
HAServiceProtocolHelper.TransitionToActive(localTarget.GetProxy(conf, FailoverController
.GetRpcTimeoutToNewActive(conf)), CreateReqInfo());
string msg = "Successfully transitioned " + localTarget + " to active state";
Log.Info(msg);
serviceState = HAServiceProtocol.HAServiceState.Active;
RecordActiveAttempt(new ZKFailoverController.ActiveAttemptRecord(true, msg));
}
catch (Exception t)
{
string msg = "Couldn't make " + localTarget + " active";
Log.Fatal(msg, t);
RecordActiveAttempt(new ZKFailoverController.ActiveAttemptRecord(false, msg + "\n"
+ StringUtils.StringifyException(t)));
if (t is ServiceFailedException)
{
throw (ServiceFailedException)t;
}
else
{
throw new ServiceFailedException("Couldn't transition to active", t);
}
}
}
}