This is a general statement that would be helpful to break down, i.e., what exactly do you mean by “not usable from the pool”? That they aren’t in the pool, that they get dropped from the DNS rotation of the pool, that they don’t respond well to client requests? See the following for some aspects I mean.
This indeed doesn’t look too good. But please note that in some cases, “far away” servers yield better scores than ones that I would expect to be “closer”, such as the ones in Hongkong, Singapore, or Taiwan. But admittedly, those are likely still “outside” the Chinese domestic network in terms of network distance, despite relative geographical proximity.
Regardless, the pool could do a better job in more aggressively promoting monitors with higher scores into the “active” monitor role. I’ve had similar issues with some of my own servers.
This server not being available is not the fault of the pool, but the decision of the person who added the server to the pool. It is the owners of a server who need to allow for a server to be added to the pool, and should ideally do so themselves (the verification mechanism will enforce that going forward). So just because there generally may be more servers in the China region, that doesn’t mean they are suitable to be added to the pool. That is entirely up to the owner/operator of each server, and a server certainly shouldn’t be added to the pool without the server operator’s consent.
Actually, it is already deleted. And again, that is entirely the decision of the person who added the server to the pool. There is nothing the pool can do if someone decides to take their server out of the pool.
I am obviously not directly involved in those cases, so cannot comment first hand. But it is not my impression that servers would be “rejected”, and that because they are “far from China”. Rather, adding servers to zones other than the one auto-detected for them (including cases where the auto-detection was wrong) is a manual process, and that is a huge bottleneck. See many other isues pending for a long time as well, e.g., vendor zones.
Again, I cannot comment first hand. I was just observing that there are servers in many places, sometimes multiple ones in rather small zones. So maybe the communication just fell between the cracks, as hinted at above happens in many, many cases. I could imagine multiple people in this forum who are already operating monitors being willing to help setting one up in the China zone, but at the end of the day, @ask will likely need to do something to add it to the system. No guarantee, but the more has been prepared, the less he’d need to do, the higher I’d expect the likelihood it could succeed.
I am not discounting that the monitoring from outside the zone isn’t a contributing factor, but considering this server mentioned above, that does’t seem to be the general case. I.e., some servers seem to get good enough scores despite being monitored from outside the zone. And note as well that this server, not being in the pool, may also be seeing less traffic, which is again no proof, but a hint that load on the servers may be more of a factor than the monitoring.
That is obviously nothing I have recent first-hand experience. But then, I don’t fully understand the issue, because then there should be enough capacity to handle all requests, even as some servers maybe move out of and back into the pool periodically. But seeing the issue that triggered this thread, I would say that there maybe isn’t enough capacity if one server dropping out of the zone can cause such a chain reaction of then further servers dropping out, and the situation only recovering when the load drops during the night.
Ok, that is a big difference to other zones, which do not rely on a few big servers, but where there are hundreds of small servers as well which have no issue operating in the pool without getting overloaded. This reliance on a few big servers, and the instability it causes if one of them temporarily drops out for whatever reason, suggest that that situation is not a healthy one. Even manually adding further servers from outside the zone would only ever be a temporary patch only, as suggested by this topic resurfacing peridically. Even if manually adding servers were easier, e.g., if operators could add their own servers to other zones without need for admin intervention. So I still think that beyond adding monitors in the China zone to counter to some degree at least the high reliance on a few big servers, broadening the server base by dissolving the regional zones would likely be the only lasting fix to the issue. And is anyhow being considered because it will be beneficial also in other zones.