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Support Article

Complete appservers are down

SA-36437

Summary



OutOfMemoryErrors occurs in Pega 7.2.2 system's batch nodes.


Error Messages



java.lang.OutOfMemoryError: Java heap space


Steps to Reproduce



Not Applicable


Root Cause



A defect or configuration issue in the operating environment.

The evidences collected so far point to a sizing problem affecting batch nodes.

The amount of threads and Listeners running concurrently can lead to excessive memory pressure. This can be exacerbated by any slowdown occurring while handling those requests due to increased response time from external services for example, Databases, Remote Services, and so on.

Allocated heap (4GB) is too small compared to the actual load observed on the system.


Pega 7 Platform Installation Guide for WebSphere and DB2-LUW available at the link below recommends an heap size between 4 and 8 GB but larger heaps are advisable when the application allow a high number of concurrent tasks:

https://pdn.pega.com/documents/pega-722-platform-installation-guide-ibm-websphere-and-ibm-db2-linux-unix-and-windows

Resolution



Make the following changes to the operating environment:
  • Increase the heap size for batch nodes. In doing so ensure to leave at least 4 GB of free memory for the Operating System, buffering and external processes.
  • In the medium term evaluate the opportunity to add additional batch nodes to distribute the load.

Published May 6, 2017 - Updated October 8, 2020

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