public NotifyReplicaAboutCrashReply NotifyReplicaAboutCrashHandler(NotifyReplicaAboutCrashRequest request)
{
Console.WriteLine(">>> Received Notification about crashed server...");
Console.WriteLine(">>> PartitionName=" + request.PartitionId + ", Crashed Server=" + request.CrashedMasterServerId);
CrashUtils.RemoveCrashedServerFromMyLocalPartition(request.IsMasterCrashed, request.PartitionId, request.CrashedMasterServerId);
return(new NotifyReplicaAboutCrashReply {
Ok = true
});
}
public NotifyCrashReply HandleServerCrash(string partitionName, string crashedMasterServerId)
{
Console.WriteLine("--------------------");
Console.WriteLine(">>> SERVER: Handle Crash...");
Console.WriteLine("--------------------");
string currentMasterServerId = Shared.Util.PartitionMapping.GetPartitionMaster(partitionName);
Console.WriteLine(">>> Current Partition Master is: MasterId=" + currentMasterServerId);
Partition partition = server.getPartition(partitionName);
IsAliveReply isAliveReply = CrashUtils.CheckIfServerIsStillAlive(partition, crashedMasterServerId);
if (isAliveReply != null && isAliveReply.Ok)
{
Console.WriteLine(">>> Server is Alive! Sending back the MasterId: MasterId=" + currentMasterServerId);
return(new NotifyCrashReply
{
Status = "OK",
MasterId = currentMasterServerId
});
}
bool isMasterCrashed = Shared.Util.PartitionMapping.IsMaster(partitionName, crashedMasterServerId);
if (isMasterCrashed)
{
// the crashed server is the previous partition master
Console.WriteLine(">>> The Crashed server was a master. MasterId=" + crashedMasterServerId);
CrashUtils.RemoveCrashedServerFromMyLocalPartition(isMasterCrashed, partitionName, crashedMasterServerId);
CrashUtils.NotifyAllReplicasAboutCrashedServer(partition, partitionName, crashedMasterServerId, isMasterCrashed);
string newMasterId = ElectPartitionMaster(partitionName, crashedMasterServerId);
return(new NotifyCrashReply
{
Status = "OK",
MasterId = newMasterId
});
}
else
{
// the crashed server is a replica
Console.WriteLine(">>> The Crashed server is a replica. The Master Remain the same. MasterId=" + crashedMasterServerId);
CrashUtils.RemoveCrashedServerFromMyLocalPartition(isMasterCrashed, partitionName, crashedMasterServerId);
CrashUtils.NotifyAllReplicasAboutCrashedServer(partition, partitionName, crashedMasterServerId, isMasterCrashed);
Console.WriteLine(">>> Sending Back Current Master Id: MasterId=" + currentMasterServerId);
Console.WriteLine("--------------------");
return(new NotifyCrashReply
{
Status = "OK",
MasterId = currentMasterServerId
});
}
}
