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Support Article

Upgraded to 7.1 and see PEGA0017



A high number of Pega0017 ALERT messages are seen in the PegaRULES-ALERT log file that correspond to declaratives/fragments MRU cache.

Error Messages

Pega0017 ALERT messages in PegaRULES-ALERT log file viz.
    *declaratives/fragments: Successfully reduced Concurrent MRU Map by201 down to: 1000.*

Steps to Reproduce

Not Applicable

Root Cause

The root cause of this problem is a defect in Pegasystems’ code/rules. The default value of
declaratives/fragments MRU cache size of 1000 is too small for the Pega Application. Hence, PegaRULES engine is repeatedly trying to bring the size down to the set limit and thereby generating these ALERTs.


This issue is resolved through the following local change:

Add this Dynamic System Setting and set its value to 5000

Published January 31, 2016 - Updated October 8, 2020

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