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Question

Bukkit Minecraft server spontaneously quits when rendering dynmap

  • Posted October 21, 2013

Hello all,

I am wanting to set up and run a CraftBukkit-based Minecraft server on a droplet. I have installed Java, set up FTP access to transfer in my existing files, and have gotten the server to actually run, so things are going pretty well - but I have hit a snag.

The problem seems to be coming from the dynmap plugin. To save time in transferring the server files, I installed dynmap afresh, and I now want it to fully render the map tile images for the server’s world. However, when I activate the render process, it will run for about 10-20 seconds and then the Minecraft server terminates with no error message.

I have tried this on a 2GB droplet (using 1.5GB RAM for the Bukkit server) and then later on a 4GB droplet (using 3GB for Bukkit). Both times I hit the same problem, although it did take longer for the server to “crash” when trying it on the 4GB droplet.

Am I perhaps hitting some limit with regard to CPU usage, which is in turn automatically killing the Bukkit server process?

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Kamal Nasser • February 17, 2014

It’s probably running out of memory. Try adding swap or upgrading your droplet: <a href=“https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04”>https://www.digitalocean.com/community/articles/how-to-add-swap-on-ubuntu-12-04</a>. <br> <br>Also try replacing <code>-Xms1024M</code> with <code>-Xms512M</code>.

droplet • February 16, 2014

It’s like the process is getting killed by some kind of manager to detect too-high cpu usage?? I have the same problem. <br> <br>Process started t = 2014-02-16 16:17:39 <br> <br>~ 16:20:13 (t + 4mins) --> <br> <br>>./start_server.sh: line 11: 1492 Killed java -Xmx1024M -Xms1024M -jar craftbukkit-1.7.2-R0.3.jar -o true <br>

th • October 22, 2013

I had the same problem a while back that I solved using more memory and 64bit java. <br>Last time I did a full render I used 5gb for bukkit and I had no crashes. <br> <br>I start my server with following command, hope it helps: <br>screen -A -m -S “mc” java -d64 -Xms100M -Xmx5000M -jar -server -Djava.net.preferIPv4Stack=true -XX:+UseConcMarkSweepGC -XX:+DisableExplicitGC -XX:+UseAdaptiveGCBoundary -XX:MaxGCPauseMillis=500 -XX:-UseGCOverheadLimit -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:SurvivorRatio=16 -XX:UseSSE=3 -XX:+AggressiveOpts craftbukkit-1.6.4-R.0.1.jar nogui

telkir • October 21, 2013

Yes, I did check the log to make sure no error message was being caught there, and there’s nothing useful. The last line is from dynmap as it starts the render process: <br> <br>[code]2013-10-21 08:34:14 [INFO] Full render starting on world ‘avalon’…[/code] <br> <br>If I choose to not start a render the server will run indefinitely without problems.

Kamal Nasser • October 21, 2013

Is there anything in the error logs? <pre>tail -20 /path/to/minecraft.log</pre>