Frequent Notbook service restarts required

abdullah_1 · ‎12-09-2025

Symptoms

Seeing the error below on a very frequent basis, which forces the user to restart the Notebook service.

Diagnosis

Check the Notebook logs that can be found in the Analytics data collection in a file with name zeppelin--delmonte-dev-0.out.

The error found is an out of memory, as per below:

ERROR [2025-09-19 19:32:05,270] ({qtp1371957475-13994} WebApplicationExceptionMapper.java[toResponse]:49) - Error response
java.lang.OutOfMemoryError: Java heap space
 INFO [2025-09-19 19:32:05,648] ({qtp1371957475-14620} NotebookServer.java[onClose]:477) - Closed connection to 10.248.66.38:38752 (1001) null
 INFO [2025-09-19 20:19:45,007] ({SessionValidationThread-1} AbstractValidatingSessionManager.java[validateSessions]:275) - Validating all active sessions...
 INFO [2025-09-19 20:19:45,007] ({SessionValidationThread-1} AbstractValidatingSessionManager.java[validateSessions]:308) - Finished session validation.  No sessions were stopped.
 INFO [2025-09-19 20:28:48,032] ({qtp1371957475-14623} LoginRestApi.java[postLogin]:249) - {"status":"OK","message":"","body":{"principal":"incorta_admin","ticket":"2271845e-5273-4d35-875e-edcd34614f3d","roles":"[\"admin\"]"}}
 INFO [2025-09-19 20:28:48,541] ({qtp1371957475-14628} LocalConfigStorage.java[save]:53) - Save Interpreter Setting to /home/incorta/IncortaAnalytics/IncortaNode/notebooks/services/dcf24782-ec1a-46fc-9cca-99a9c3cbe018/conf/interpreter.json
ERROR [2025-09-19 20:28:48,866] ({qtp1371957475-14628} WebApplicationExceptionMapper.java[toResponse]:49) - Error response
java.lang.OutOfMemoryError: Java heap space
 INFO [2025-09-19 20:28:49,792] ({qtp1371957475-14634} LoginRestApi.java[postLogin]:249) - {"status":"OK","message":"","body":{"principal":"incorta_admin","ticket":"2271845e-5273-4d35-875e-edcd34614f3d","roles":"[\"admin\"]"}}
 INFO [2025-09-19 20:28:49,952] ({qtp1371957475-14637} InterpreterRestApi.java[restartSetting]:208) - Restart interpreterSetting undefined, msg=
ERROR [2025-09-19 20:28:49,953] ({qtp1371957475-14637} WebApplicationExceptionMapper.java[toResponse]:49) - Error response
java.lang.NullPointerException: null
	at org.apache.zeppelin.interpreter.InterpreterSettingManager.close(InterpreterSettingManager.java:1083) ~[zeppelin-zengine-2.8.jar:2.8]
	at org.apache.zeppelin.rest.InterpreterRestApi.restartSetting(InterpreterRestApi.java:216) ~[zeppelin-server-2.8.jar:2.8]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_312]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_312]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_312]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_312]

Solution

From the backend increase the memory allocated to notebooks from 1 GB (default) to 2 GB:

cd /home/incorta/IncortaAnalytics/IncortaNode/notebooks/runtime/bin
vi common.sh
change "export ZEPPELIN_MEM="-Xms1024m -Xmx1024m" > "export ZEPPELIN_MEM="-Xms2024m -Xmx2024m" 
and "export ZEPPELIN_INTP_MEM="-Xms1024m -Xmx1024m" > "export ZEPPELIN_INTP_MEM="-Xms2024m -Xmx2024m"

Then restart the Notebook service from CMC.