[MC-178326] Lighting issue

Attached are screenshots of coordinates [-9713.7, 74, 10230.7] for seed 2952352923753510649. Screenshots attached to display client information and odd lighting effect - otherwise gameplay works well.

The server environment information: Ubuntu 18.04.4 LTS / kernel 5.6.0 x86_64 / java 14 2020-03-17 / Java(TM) SE Runtime Environment (build 14+36-1461) / Java HotSpot(TM) 64-Bit Server VM (build 14+36-1461, mixed mode, sharing) / Minecraft Server Snapshot 20w15a / AWS t2.small EC2 instance / 2GB swap

JAR init : java -server -XX:+UseG1GC -XX:MaxGCPauseMillis=100 -Xmx1625574K -jar 20w15a.jar nogui

Attachments

Screen Shot 2020-04-12 at 3.03.31 PM.png

seed[2952352923753510649]_coords_-9713.7_74_10230.7_light_bug.png

Comments 20

migrated 2020-04-11T22:10:44Z

[media][media][media]

[^seed[2952352923753510649]coords-9713.7_74_10230.7_light_bug.png]
[^seed[2952352923753510649]_settings.png]

wobst.michael 2020-04-12T09:39:47Z

Can you please create that same screenshot as seen in [^seed[2952352923753510649]coords-9713.7_74_10230.7_light_bug.png] with the debug screen enabled (hit the F3 key).

Also in what version was this build what we can see on this particular screenshot?

Y T 2020-04-12T14:47:44Z

New screenshot uploaded as file

[media]

with debug screen enabled. Thankfully I had a slightly older copy of the server - sort of instinctively I ran inside the building and put a torch in the dark area and that pretty much resolved the bug - then I removed the torch. After restarts and a few game-day cycles it retained the fix after placing and removing the torch.

Y T 2020-04-12T15:00:00Z

Added also

[media]

while standing in the darkened area instead of next to it like

[media]

wobst.michael 2020-04-12T15:01:53Z

So in what version of Minecraft did you build this?

10 more comments

Y T 2020-04-12T15:03:27Z

Ah yes, forgot that part - originally this was built in version `1.15.2`.

wobst.michael 2020-04-12T15:06:44Z

Was that pure vanilla, or some other server software like spigot?

j4i 2020-04-12T15:14:14Z

this isn't a bug this is a lighting glitch

went to the seed on the snapshot at the coords, lighting's fine in my client, friends couldn't verify

Y T 2020-04-12T15:14:20Z

It is pure vanilla - so far nothing extra added or removed. I deleted the `world` directory and just now re-building the world under snapshot `20w15a`.

Y T 2020-04-12T17:01:41Z

Can confirm - re-building world seed 2952352923753510649 with latest snapshot 20w15a did not present the issue. Maybe helpful information to attempt replicating issue: The world was built and run with version 1.15.2, then followed by running with 20w06a, 20w13b, 20w14a, and 20w15a but I imagine since latest snapshot alone does not repeat the issue I would think it's been fixed. Perhaps just a glitch in transitioning between versions.

Balaram Chakrabarty 2020-04-12T22:05:52Z

I have this chunck lighting issue

slicedlime 2020-04-16T07:25:45Z

We cannot reproduce this. Could you please provide reproduction steps that reproduce the issue in the latest snapshot, or a world download that demonstrates the issue?

Y T 2020-04-17T02:58:53Z

I will attempt to replicate and return with results - I didn't extend beyond mixing running server versions 1.15.2, 20w06a, 20w13b, 20w14a, and 20w15a.

Y T 2020-04-17T05:55:50Z

I just noticed you mentioned I can provide the world download - much easier. Link for world download : https://we.tl/t-JsEmBiWXzv - this is the backup I referred to from 4 days ago. I updated the spawn point to get closer to the village area itself.

In case it's needed, I would xz -d <file.tar.gz.xz> then usual tar xf <file.tar.gz>

digest:

# SHA256 HASH
c3ca4345b2d1139186a81503eb95c723a5d460909dfa4c9f0fa2d04a7ce8c46c mc-server-debug.seed-2952352923753510649.20w15a.coord_-9713.011_74_10230.008.tar.gz.xz
# WHIRLPOOL HASH
14bda8c01db769c75e1425233ed7d14a949d4086c18ea56232e8663823cd04c9759c235f43fb7ef4e9db2ef7f53c667751763537a2aba2ff72d36b2b4ced4d79 mc-server-debug.seed-2952352923753510649.20w15a.coord_-9713.011_74_10230.008.tar.gz.xz

j4i 2020-04-23T17:12:36Z

bud i just reread your environment, you're using java 11 aren't you? this isn't a supported version of java for this game...

violine1101 2020-06-15T12:50:38Z

It seems like the height map of your world is corrupted. Please check if optimizing the world solves the issue.

Thommy Siverman 2020-06-15T13:18:01Z

@unknown Download link is expired. Can you reattach the world?

Y T 2020-06-15T19:11:25Z

Greetings, I did not realize there was an expiration on the link.

Uploaded again - same digest as before; filesize of the tar is showing for me 374251708 bytes; download link : https://we.tl/t-EEyOfh85lF

Sounds like a breakthrough finding the corrupted data 🙂

I'm reading up on how to optimize the world, will try that when able.

Y T 2020-06-27T04:47:16Z

Sorry i took a while for me to confirm - finally got to optimizing the world 🙂

I'd like to move this ticket to resolved.

In my search for how to optimize a world I found another ticket referencing this fix: MC-142134S6

`java -jar ./bin/20w15a/minecraft_server.20w15a.jar bin/20w15a --forceUpgrade --eraseCache` [solved] the issue.

Another reference I found regarding world optimization was @ https://www.reddit.com/r/Minecraft/comments/bmqsv3/fixing_server_world/

I was curious whether the Java version would be a defining factor as well but I ultimately don't know - I figured newer versions would still have backwards compatibility.

Many thanks for everyone's support here.

Thommy Siverman 2020-07-01T11:47:24Z

Not an issue after optimizing.