public override void checkFairness_blades(hostDB db, disposingList <lockableBladeSpec> blades)
{
// If a blade owner is under its quota, then promote it in any queues where the current owner is over-quota.
currentOwnerStat[] stats = db.getFairnessStats(blades);
string[] owners = stats.Where(x => x.ownerName != "vmserver").Select(x => x.ownerName).ToArray();
if (owners.Length == 0)
{
return;
}
float fairShare = (float)db.getAllBladeIP().Length / (float)owners.Length;
currentOwnerStat[] ownersOverQuota = stats.Where(x => x.allocatedBlades > fairShare).ToArray();
List <currentOwnerStat> ownersUnderQuota = stats.Where(x => x.allocatedBlades < fairShare).ToList();
foreach (currentOwnerStat migrateTo in ownersUnderQuota)
{
var migratory = blades.Where(x =>
(
// Migrate if the dest is currently owned by someone over-quota
(ownersOverQuota.Count(y => y.ownerName == x.spec.currentOwner) > 0) ||
// Or if it is a VM server, and currently holds VMs that are _all_ allocated to over-quota users
(
x.spec.currentOwner == "vmserver" &&
db.getVMByVMServerIP_nolocking(x.spec.bladeIP).All(vm =>
(ownersOverQuota.Count(overQuotaUser => overQuotaUser.ownerName == vm.currentOwner) > 0)
)
)
)
&&
x.spec.nextOwner == migrateTo.ownerName &&
(x.spec.state == bladeStatus.inUse || x.spec.state == bladeStatus.inUseByDirector)).ToList();
{
if (migratory.Count == 0)
{
// There is nowhere to migrate this owner from. Try another owner.
continue;
}
// Since migration cannot fail, we just take the first potential.
// TODO: should we prefer non VM-servers here?
lockableBladeSpec newHost = migratory.First();
if (newHost.spec.currentlyBeingAVMServer)
{
// It's a VM server. Migrate all the VMs off it (ie, request them to be destroyed).
newHost.spec.nextOwner = migrateTo.ownerName;
using (disposingList <lockableVMSpec> childVMs = db.getVMByVMServerIP(newHost,
bladeLockType.lockNone, bladeLockType.lockOwnership))
{
foreach (lockableVMSpec VM in childVMs)
{
Debug.WriteLine("Requesting release for VM " + VM.spec.VMIP);
VM.spec.state = bladeStatus.releaseRequested;
}
}
newHost.spec.nextOwner = migrateTo.ownerName;
newHost.spec.state = bladeStatus.releaseRequested;
}
else
{
// It's a physical server. Just mark it as .releaseRequested.
Debug.WriteLine("Requesting release for blade " + newHost.spec.bladeIP);
newHost.spec.nextOwner = migrateTo.ownerName;
newHost.spec.state = bladeStatus.releaseRequested;
}
}
}
}