Problem Lag Spikes, Odd Error

  • The FTB Forum is now read-only, and is here as an archive. To participate in our community discussions, please join our Discord! https://ftb.team/discord
S

Shadus

New Member
Jul 29, 2019
11
0
0
One of the servers I maintain has been getting the following error increasingly frequently and with it, huge lag spikes that are making some players completely unresponsive (20-30s to open a chest, eventual disconnect.) I've tried common solutions, delete player files, restart server, provide more ram, update java, etc.

Code: 
2013-05-10 04:25:28 [INFO] [STDERR] java.util.ConcurrentModificationException
2013-05-10 04:25:28 [INFO] [STDERR]    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
2013-05-10 04:25:28 [INFO] [STDERR]    at java.util.HashMap$ValueIterator.next(HashMap.java:839)
2013-05-10 04:25:28 [INFO] [STDERR]    at bq.a(SourceFile:24)
2013-05-10 04:25:28 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:25:28 [INFO] [STDERR]    at ca.a(CompressedStreamTools.java:140)
2013-05-10 04:25:28 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:198)
2013-05-10 04:25:28 [INFO] [STDERR]    at aam.c(AnvilChunkLoader.java:184)
2013-05-10 04:25:28 [INFO] [STDERR]    at aiw.b(SourceFile:29)
2013-05-10 04:25:28 [INFO] [STDERR]    at aiw.run(SourceFile:22)
2013-05-10 04:25:28 [INFO] [STDERR]    at java.lang.Thread.run(Thread.java:679)
2013-05-10 04:34:43 [INFO] [STDERR] java.util.ConcurrentModificationException
2013-05-10 04:34:43 [INFO] [STDERR]    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
2013-05-10 04:34:43 [INFO] [STDERR]    at java.util.HashMap$ValueIterator.next(HashMap.java:839)
2013-05-10 04:34:43 [INFO] [STDERR]    at bq.a(SourceFile:24)
2013-05-10 04:34:43 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:34:43 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:34:43 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:34:43 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:34:43 [INFO] [STDERR]    at by.a(SourceFile:26)
2013-05-10 04:34:43 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:34:43 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:34:43 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:34:43 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:34:43 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:34:43 [INFO] [STDERR]    at ca.a(CompressedStreamTools.java:140)
2013-05-10 04:34:43 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:198)
2013-05-10 04:34:43 [INFO] [STDERR]    at aam.c(AnvilChunkLoader.java:184)
2013-05-10 04:34:43 [INFO] [STDERR]    at aiw.b(SourceFile:29)
2013-05-10 04:34:43 [INFO] [STDERR]    at aiw.run(SourceFile:22)
2013-05-10 04:34:43 [INFO] [STDERR]    at java.lang.Thread.run(Thread.java:679)
2013-05-10 04:40:42 [INFO] [STDERR] java.util.ConcurrentModificationException
2013-05-10 04:40:42 [INFO] [STDERR]    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
2013-05-10 04:40:42 [INFO] [STDERR]    at java.util.HashMap$ValueIterator.next(HashMap.java:839)
2013-05-10 04:40:42 [INFO] [STDERR]    at bq.a(SourceFile:24)
2013-05-10 04:40:42 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:40:42 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:40:42 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:40:42 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:40:42 [INFO] [STDERR]    at by.a(SourceFile:26)
2013-05-10 04:40:42 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:40:42 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:40:42 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:40:42 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:40:42 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:40:42 [INFO] [STDERR]    at ca.a(CompressedStreamTools.java:140)
2013-05-10 04:40:42 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:198)
2013-05-10 04:40:42 [INFO] [STDERR]    at aam.c(AnvilChunkLoader.java:184)
2013-05-10 04:40:42 [INFO] [STDERR]    at aiw.b(SourceFile:29)
2013-05-10 04:40:42 [INFO] [STDERR]    at aiw.run(SourceFile:22)
2013-05-10 04:40:42 [INFO] [STDERR]    at java.lang.Thread.run(Thread.java:679)
2013-05-10 04:42:12 [INFO] [STDERR] java.util.ConcurrentModificationException
2013-05-10 04:42:12 [INFO] [STDERR]    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
2013-05-10 04:42:12 [INFO] [STDERR]    at java.util.HashMap$ValueIterator.next(HashMap.java:839)
2013-05-10 04:42:12 [INFO] [STDERR]    at bq.a(SourceFile:24)
2013-05-10 04:42:12 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:42:12 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:42:12 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:42:12 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:42:12 [INFO] [STDERR]    at by.a(SourceFile:26)
2013-05-10 04:42:12 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:42:12 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:42:12 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:42:12 [INFO] [STDERR]    at bq.a(SourceFile:25)
2013-05-10 04:42:12 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-10 04:42:12 [INFO] [STDERR]    at ca.a(CompressedStreamTools.java:140)
2013-05-10 04:42:12 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:198)
2013-05-10 04:42:12 [INFO] [STDERR]    at aam.c(AnvilChunkLoader.java:184)
2013-05-10 04:42:12 [INFO] [STDERR]    at aiw.b(SourceFile:29)
2013-05-10 04:42:12 [INFO] [STDERR]    at aiw.run(SourceFile:22)
2013-05-10 04:42:12 [INFO] [STDERR]    at java.lang.Thread.run(Thread.java:679)

Any ideas? First I've seen this one and not finding much on solving it.

Running FTB Ultimate 1.0.1 on 3.4.37 SMP x86_64. 17g of ram, 2 processors, invoking with 12g of ram (up from 8 to try to slow it down-- no real help.) Tried it on and off of ramdisk, load is nominal, less than 0.5 with spikes up to 0.75 at most. Disk io is reasonable and there is no real iowait. I'm at a loss.

This is pretty much standard ftb ultimate with dynmap added. It has run cleanly without these errors for quite a while and these just started.

Edit: Just tired a full copy on a physical 8 core machine with 32gb of ram, it's still doing it.
 
M

MacrosBlackD

New Member
Jul 29, 2019
5
0
0
I'm also receiving this error

Code: 
2013-05-16 20:46:30 [INFO] [STDERR] java.util.ConcurrentModificationException
2013-05-16 20:46:30 [INFO] [STDERR]    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839)
2013-05-16 20:46:30 [INFO] [STDERR]    at java.util.HashMap$ValueIterator.next(HashMap.java:868)
2013-05-16 20:46:30 [INFO] [STDERR]    at bq.a(SourceFile:24)
2013-05-16 20:46:30 [INFO] [STDERR]    at cd.a(SourceFile:114)
2013-05-16 20:46:30 [INFO] [STDERR]    at ca.a(CompressedStreamTools.java:140)
2013-05-16 20:46:30 [INFO] [STDERR]    at aam.a(AnvilChunkLoader.java:198)
2013-05-16 20:46:30 [INFO] [STDERR]    at aam.c(AnvilChunkLoader.java:184)
2013-05-16 20:46:30 [INFO] [STDERR]    at aiw.b(SourceFile:29)
2013-05-16 20:46:30 [INFO] [STDERR]    at aiw.run(SourceFile:22)
2013-05-16 20:46:30 [INFO] [STDERR]    at java.lang.Thread.run(Thread.java:722)
 
You must log in or register to reply here.
Top Bottom