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Support Article

High number of PEGA0017 "Cache Reduced" alerts

SA-10139

Summary



The PegaRULES-ALERT logfile has a high number of PEGA0017 alerts. 

Error Messages



2015-04-21 09:14:55,348 GMT*7*PEGA0017*30000*30000*b143fc226303d069cc2910501cbde037*NA*NA*HAEA09864BB26CE0133E84BAA3D3DF852*[ASSORTED ALERT MESSAGE CONTENT]*collections/mru/PropertyReference: Successfully reduced Concurrent MRU Map by 2986 down to: 33219.*

Steps to Reproduce



Not Applicable

Root Cause



This alert occurs when certain cache sizes configured are insufficient for the environment. As a result of undersized caches, the system is forced to purge items from the cache regardless of usage. This can also cause an unusually high number of cache misses and negatively impact system performance.

Resolution



To raise the cache sizes, create Dynamic System Settings with the following Setting Purposes and Values. Note that these values need to be raised based on your environment requirements, but larger caches impact the overall JVM memory usage.

Purpose: prconfig/collections/mru/propertyreference/instancecountlimit/default
Value: 200000

Purpose: prconfig/declaratives/fragments/instancecountlimit/default 
Value: 50000

Published June 12, 2015 - Updated October 8, 2020

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