SpectroWatch evaluation fails periodically with error "The evaluation of watch <watch_name> failed for model <model_name>: SPC-WCH-20072:This is a user defined error."

Products

• CA Spectrum

Issue/Introduction

When creating SpectroWatches with multiple levels of watches for monitoring all of the instances of an interface after a few poll cycles we see the following error:

The evaluation of watch <watch_name> failed for model <model_name>: SPC-WCH-20072:This is a user defined error.

The recovery and failure of the evaluation repeats periodically every two/three polling intervals.

Environment

Release : 10.4.2.1 / 10.4.2.2

Component : Spectrum Core / SpectroSERVER Watches

Cause

The scratchpad data becomes null and the watches will fail.

Resolution

For Spectrum 10.4.2.1 please request patch d74

For Spectrum 10.4.2.2 please request patch d88

 

For Spectrum 10.5 / 21.2.1 there is a VNMRC setting that can be added

enable_instancelist_watch_scratchpad_fix=true

Additional Information

This has been included out of box in Spectrum 21.2.1 and only .vnmrc setting is required.

 

Symptom: When I create a filter with multi-level watches to monitor all the instances of any attribute, in very rare-case due to missing data in the scratchpad, DX NetOps Spectrum watches exit abruptly with a user-defined error.
Resolution: Code changes are made to set enable_instancelist_watch_scratchpad_fix to true to re-load the scratchpad with the latest data so that the watch evaluation executes properly. (DE485740, 21.2.1)