Error when starting distributed executor.

KNIME Server
1

Hi All,

I am trying to run an onprem executor for our AWS hosted KNIME Server. When I try to start the executor on the local machine, it fails with a slightly cryptic error message listed below. This error only occurs when I try to set the distributed executor options. The same options work fine on another executor on the same aws vpc as the knime server.

Command:
knime -nosplash -consolelog -application com.knime.enterprise.slave.KNIME_REMOTE_APPLICATION

Error: Could not find or load main class http:…:8080.knime.rest.v4.profiles.contents
Dumping CPU usage in old prof format … done.
Knime: Cannot open display:
Knime:
JVM terminated. Exit code=1

2

Hi Aaron,
Could you share your knime.ini file and the versions of server and executor you are using?
Kind regards,
Alexander

3

Hi Alexander,

The executor version is 4.3.2, the prebuilt linux build from the knimecom-product-downloads page. This is the same build we are using on our working executor.

Commenting out the lines in bold allow the executor to start.

-startup
plugins/org.eclipse.equinox.launcher_1.5.700.v20200207-2156.jar
–launcher.library
plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.1100.v20190907-0426
-vm
plugins/org.knime.binary.jre.linux.x86_64_1.8.0.252-b09/jre/bin
-vmargs
-server
-Dsun.java2d.d3d=false
-Dosgi.classloader.lock=classname
-XX:+UnlockDiagnosticVMOptions
-XX:+UnsyncloadClass
-XX:+UseG1GC
-Dsun.net.client.defaultReadTimeout=0
-XX:CompileCommand=exclude,javax/swing/text/GlyphView,getBreakSpot
-Xmx60g
-profileLocation
http://hostname:8080/knime/rest/v4/profiles/contents
-profileList
remote-executor
-Dcom.knime.enterprise.executor.msgq=amqp://user:password@hostname/knime-server
-Dorg.eclipse.swt.internal.gtk.disablePrinting
-Darrow.enable_unsafe_memory_access=true
-Darrow.memory.debug.allocator=false
-Darrow.enable_null_check_for_get=false
-Dcom.knime.enterprise.executor.reservation=OnPrem

4

Also, just FYI I can wget the zip file from the profileLocation from the machine without issue

5

Hi Aaron,
The bold lines need to go before the -vmargs line, then it should work as expected.
Kind regards,
Alexander

1 Like
6

That was it! Thanks for the quick help!