When using the command of /fill for a comparative large range (even 50*50) in minecraft realms, it causes a bug that when breaking the blocks or placing new blocks in the selected range(in that /fill command), the game gets stuck and, updates very slow and sometimes causes a "no respond" and even a game crash. It affects EVERY members in the realms who are online. This problem can't be fixed by just restart the game. The only way to fix the problem now is to download the world, reset the old one and re-upload.
Note that these situation WOULD NOT cause this problem:1.filling blocks vertically 2.if the block broken is not the lowest block of the horizontal platform
Another issue is that our world is a flat world with lava on the bottom part. I don't know if this will happen or not in normal world.
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it only happens in realms, does not affect single play

Does it eventually go back to normal?

If re-upload, yes. But realms only allow to make 3 uploads in 72h

In addition, it seems that this bug only happens when filling blocks horizontally (vertically fill seems to be normal) .

It seems that it does that too on single player:
Filling 100*100 platform cause game crash

I am experiencing this issue or a similar issue in snapshot 15w46a. When I use the fill command for a very small area it works fine, but I can't even get it to fill a 32x32x1 area. When the command fails, there is no dialogue about command success or fail, and the game appears to be running just fine but further commands don't work and when I try to exit the game it freezes and I have to use the task manager to exit.
After further testing I discovered it will execute the command, but may take a very long time to do it. The command took almost 5 seconds to fill a 16x16x1 area (256 blocks), over 10 seconds to fill a 32x32x1 area (1024 blocks), and well over a minute to fill in a 128x128x1 area that was 1/4th filled in already (12288 blocks). It doesn't even slow the game down while queuing up this task and it takes an unreasonably long time for such a tiny amount of blocks. There is a brief lag spike as the blocks are finally laid down which varies by the number of blocks and is about the lag spike I would expect if the whole task was queued up immediately and the blocks were laid down instantly.
For scale, I run Minecraft at 14 chunk render distance and it works fine even during heavy activity, fast running, mobs everywhere, in the Nether, etc.

@@unknown: After issuing the fill command, please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher to this ticket.

Completely ignored arguments: [--nativeLauncherVersion, 286]
[23:32:36] [Client thread/INFO]: Setting user: reaverofdarknes1
[23:32:36] [Client thread/INFO]: (Session ID is token:1e082b25c14747459f96263f5b5280a2:4658cd4584c4420ca0bb4f630d934450)
[23:32:37] [Client thread/INFO]: LWJGL Version: 2.9.4
[23:32:37] [Client thread/INFO]: Reloading ResourceManager: Default
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:block.brewing_stand.brew
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:block.chorus_flower.death
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:block.chorus_flower.grow
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:enchant.thorns.hit
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.guardian.thorns
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.horse.eat
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.crit
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.knockback
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.parry
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.strong
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.sweep
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.player.attack.weak
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.rabbit.attack
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shield.block
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.ambient
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.close
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.death
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker.open
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker_bullet.hit
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.shulker_bullet.hurt
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.ambient
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.death
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.drink
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.hurt
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.witch.throw
[23:32:38] [Client thread/WARN]: Missing sound for event: minecraft:entity.zombie.infect
[23:32:38] [Sound Library Loader/INFO]: Starting up SoundSystem...
[23:32:38] [Thread-5/INFO]: Initializing LWJGL OpenAL
[23:32:38] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[23:32:38] [Thread-5/INFO]: OpenAL initialized.
[23:32:38] [Sound Library Loader/INFO]: Sound engine started
[23:32:39] [Client thread/INFO]: Created: 1024x512 textures-atlas
[23:32:40] [Client thread/ERROR]: Realms module missing
[23:32:51] [Server thread/INFO]: Starting integrated minecraft server version 15w46a
[23:32:51] [Server thread/INFO]: Generating keypair
[23:32:52] [Server thread/INFO]: Preparing start region for level 0
[23:32:53] [Server thread/INFO]: Preparing spawn area: 52%
[23:32:53] [Server thread/INFO]: reaverofdarknes1[local:E:19dfbbc9] logged in with entity id 220 at (-0.25652287982562894, 81.0, 0.29327201461914576)
[23:32:53] [Server thread/INFO]: reaverofdarknes1 joined the game
[23:33:33] [Server thread/INFO]: [reaverofdarknes1: 4096 blocks filled]
[23:33:33] [Client thread/INFO]: [CHAT] 4096 blocks filled
[23:33:35] [Server thread/INFO]: Saving and pausing game...
[23:33:35] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Overworld
[23:33:36] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Nether
[23:33:36] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/The End
[23:35:23] [Server thread/INFO]: Saving and pausing game...
[23:35:23] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Overworld
[23:35:23] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Nether
[23:35:23] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/The End
[23:35:29] [Server thread/INFO]: Changing view distance to 12, from 10
[23:36:01] [Server thread/INFO]: [reaverofdarknes1: 16384 blocks filled]
[23:36:01] [Client thread/INFO]: [CHAT] 16384 blocks filled
[23:36:01] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 3054ms behind, skipping 61 tick(s)
[23:36:03] [Server thread/INFO]: Saving and pausing game...
[23:36:03] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Overworld
[23:36:03] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Nether
[23:36:03] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/The End
[23:36:32] [Server thread/INFO]: [reaverofdarknes1: 16384 blocks filled]
[23:36:38] [Server thread/INFO]: reaverofdarknes1 lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[23:36:38] [Server thread/INFO]: reaverofdarknes1 left the game
[23:36:38] [Server thread/INFO]: Stopping singleplayer server as player logged out
[23:36:38] [Server thread/INFO]: Stopping server
[23:36:38] [Server thread/INFO]: Saving players
[23:36:38] [Server thread/INFO]: Saving worlds
[23:36:38] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Overworld
[23:36:38] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/Nether
[23:36:38] [Server thread/INFO]: Saving chunks for level 'Skeleton Test'/The End
It was much faster this time, also I noticed that if I turn the render distance way down it goes faster, but at the time I had to turn it unreasonably low to get much responsiveness, ie. 6 chunk render distance would place 4096 blocks in a second or two, 8 chunks would place it in about 5 seconds. This time it was quite swift on 10 chunks but took a few seconds on 12 chunks. Might be because I restarted my computer since then?

@@unknown: The behaviour may be a result of high memory utilitsation. Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) to this ticket.

Done.
Folder 'crash-reports' is in '.minecraft', not 'minecraft' (two separate folders).

Folder 'crash-reports' is in '.minecraft', not 'minecraft' (two separate folders).
That depends on your platform. This is true for Windows but wrong for Linux and for OS X.

Given the described scenarios, this is almost certainly a result of lighting updates, which are comparatively expensive calculations. MC-11571 is the open issue for this problem.