this post was submitted on 07 Feb 2025
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submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]
 

I run a couple of minecraft worlds for my daughter and a few friends (yeah, ok, and for me :D ). Up to now we were running velocity and paper servers. I kept hearing that fabric servers were supposed to be more vanilla, and there were a couple of mods not ported to paper, so I wanted to try to replicate my servers with fabric.

The server runs fine, but the output of the terminal is extremely verbose compared to paper, and I don't know if this is expected or if I've got something misconfigured.

Most of the output is about "netty"

"Netty Epoll Server IO #3" at io.netty.channel.epoll.Native.epollWait(Native.java:213)
os_prio=0 cpu=6.33ms elapsed=1517.77s tid=0x00007068e00160d0 nid=1862005 runnable at io.netty.channel.epoll.Native.epollWait(Native Method)`___`

for example.

Does someone have any ideas? I wouldn't mind posting a large chunk of the output if someone thinks there might be an issue. Thanks!

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[–] [email protected] 0 points 1 month ago (1 children)

A bit unrelated, but make sure you get a backup mod and test that the backups actually work. A good mod for this is FTB Backups 2.

[–] [email protected] 0 points 1 month ago* (last edited 1 month ago)

Yes, we already had that in place. The storage is in FreeNAS and we have snapshots every half an hour. We’ve already had to use the backups because after a paper update the whitelist turned itself off and when we logged in there were 3 random persons basically destroying everything. Btw, tangent, you find an open server and your first instinct is to just start tearing everything down? Why? Anyway, we just restored to the previous snapshot and it was back to normal. Zfs snapshots are great.

[–] [email protected] 0 points 1 month ago* (last edited 1 month ago) (1 children)

honestly for modded mc i ignore errors unless i get a real issue, but that doesnt really fly for a server.

Could i see more logs and have a list of your mods? That message alone doesn't tell me much

[–] [email protected] 0 points 1 month ago (1 children)

Oh, and in case it's relevant, I'm running the jvm with these flags (I just copied over the flags I had on my paper server): -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs/ -Daikars.new.flags=true

This is a 1.21.4 server.

[–] [email protected] 0 points 1 month ago (1 children)

okay, in the logs you sent nothing really looks like an error, in that case try removing all those flags, one of them is probably causing the verbose output

[–] [email protected] 0 points 1 month ago

Ok, so I have removed all the flags and all the mods. I also shut down the upstream velocity proxy, in case it was an issue with polling the server or something. Even running by itself the consoled gets completely spammed by messages. I know that these are not errors in themselves, but spamming the console just makes catching any real errors or relevant warnings that much more difficult. As a side issue, I'm using puffer panel to manage all the worlds and installs and the spam to the console makes the admin panel unresponsive. I have no idea where to trouble shoot next.

[–] [email protected] 0 points 1 month ago

Errors will always occur and most often they don't have any actual negative effects. If there is some specific issue you are having, you can share it, but other than that, you should be fine.