I have been playing on a vanilla server, alone, I do this to avoid changing the deficulty settings, using default server settings and I noticed that mob spawning seemed really odd.
I have a Hostile Mob less Enderman farm and it causes mobs to drop 22 blocks from 127 down to 105 which is my xp killing floor level. The highest terrain in the area is 76, so I have made an idling platform at 204 or 128 blocks higher that this and only 100 higher than the mob drop zone. Now here is where the minecraft issue comes into play.
As I mentioned above, I play solo on this server, and my spawn rates were okay if I constantly went up and back down, but as soon as I idled at the top floor, my rates for spawning dropped to 0 in the mob farmm which the bottom floor was only 80 blocks away. I decided to switch my world over to the saves folder and play it single player, and instantly my mob spawn rates are back and they still work while I idle on my idle floor.
There seems to be an issue with spawn rates or distances on servers.
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My hostile mob farm is triggered with water every 50 seconds, so not every the mobs should despawn in this time, and this negates the mobs not moving as they are them pushed off an edge. The issue is not render distance, or view distance, because this should not stop mobs from spawning, mobs are not spawning when I am 80 blocks above then with no other spawning spaces within the 128 block radius. I understand that mobs have a chance to despawn, but they should still spawn within the 128 block range. Yet when I am above, they do not. It still seems like these is a difference in server defaults vs single spawn rates.
Here are my server properties.
#Minecraft server properties
#Mon Mar 17 01:36:49 MDT 2014
generator-settings=
op-permission-level=4
allow-nether=true
level-name=Ariina
enable-query=false
allow-flight=true
announce-player-achievements=true
server-port=25565
level-type=DEFAULT
enable-rcon=false
force-gamemode=false
level-seed=hidden
server-ip=192.168.1.142
max-build-height=256
spawn-npcs=true
white-list=true
spawn-animals=true
hardcore=false
snooper-enabled=true
online-mode=true
resource-pack=
pvp=false
difficulty=2
server-name=dCraft
enable-command-block=false
gamemode=0
player-idle-timeout=0
max-players=10
spawn-monsters=true
generate-structures=true
view-distance=9
spawn-protection=16
motd=Lets Play
Sorry for the delay. I have the zipped complete world. I have a platform at y205 near spawn. If you walk up the ladders below the platform, passed my mob spawner, and then rest on the platform, the rates seem to start around E20-30/# and when the spawner flushes it drops to about 15. However, I have noticed after a few minutes of either idling or working on other things up there, they drop to E0/#. I will attach the world save now.
Another note, this seems to not happen consistently, sometimes it can not happen for hours, but a lot of the time, it happens within 5-10 minutes. I transferred my world save from my server to my single saves, and it worked better, but only for a little while. I transferred it back to my server after playing it on single player while it started to stop working strongly again. Now back on the server, the mob rates have gone up again but have died back to nothing in 10 minutes.
My spawner relies on water, on several blocks (1424) to push mobs out. I am sure this creates a lot of lag to update. Could the two processes of block update lag and mob spawning be interfering with each other?
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.
This still happens in 18w10d. Mobs just don't want to spawn, even within 32 blocks range
between 24-32 0 mobs spawned even while waiting around for a long time. none, ever.
According to http://minecraft.gamepedia.com/Spawning#Despawning mobs outside a 32 blocks range of your position don't move and have a chance to despawn after 32 seconds.
A difference between single player and server is the render distance (=loaded and active world), please check your server.properties if the
view-distancethere is different to that of single player.