Known Issues¶

General unexpected behavior
- Problem: Website components are missing, pages don’t load properly, etc.
- Solution: Try reloading the page and most times this will correct the issue.
Bad Request error or website doesn’t load
- Problem: Bad Request: Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit.
- Solution: This can be caused by a browser incompatibility issue with Google Chrome and Safari. Try clearing up the cache or using the Mozilla Firefox browser instead.
Information on jobs panel does not update
- Problem: nextPYP streams information from SLURM through and HTTP-socket connection. If the connection is dropped, the information will not longer be updated on the web page. When this happens, a icon will appear at the top of the page.
- Solution: Click the icon and select Reconnect. The icon should then change into , indicating that the connection has been reestablished.
Jobs run perpetually
- Problem: The jobs panel shows that processes are running (spinning cogs) even after processing has finished.
- Solution: Cancel the jobs using the red button in the jobs panel. A page reload may also be needed.
Default format used by singularity containers and out-of-memory kills
- Problem: There is a shortcoming in the design of squashfs, the default format used by singularity containers, which causes problems when out of memory kills target processes within a container. Developers of singularity are aware of this.
- Solution: This can be prevented by making sure that there are no out-of-memory kills in your jobs by assigning more resources in the Job submission parameters. Containers can also be transformed into the ext3 format which is still supported by singularity.
No logs to highlight, job run is too old
- Problem: When the menu option to Navigate to latest logs on a block is selected, the toast message No logs to highlight, job run is too old appears.
- Solution: Go to the Jobs panel, open the Older branch and click on Load older runs. Repeat the Navigate to latest logs operation.
ERROR Service - Service error
- Problem: The server log may shows the following error message: java.lang.NoClassDefFoundError: Could not initialize class java.awt.GraphicsEnvironment$LocalGE. This error may appear if you have no graphics drivers installed in the VM running nextPYP.
- Solution: Start the Java runtime into headless mode by adding the option -Djava.awt.headless=true to the website start script config/micromon.sh.
Website is unresponsive, pages are slow to load or Error reading from remote server is displayed.
- Problem: This can be caused by the JVM running out of memory. You may see the following error message: 502 Proxy Error. The proxy server received an invalid response from an upstream server. The proxy server could not handle the request. Reason: Error reading from remote server. and the server log may show the error: Caused by: java.lang.OutOfMemoryError: Java heap space.
- Solution: Increase the memory of the JVM to 8192 MB by adding the option heapMiB = 8192 to the config.toml configuration file in the [web] section. Restart nextPYP for the changes to take effect.

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