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Support Article

One node of a cluster does not work

SA-9887

Summary



In a multi node system, running on separate servers, one of the nodes appears hung causing poor performance in the whole cluster. 
No errors or exceptions are present that would indicate a hang. However, the ALERT log displays several alerts while obtaining connections from the JDBC connection pool, some of which have high KPI values.


Error Messages



2015-04-13 06:02:02,617 GMT*7*PEGA0026*4053*100*
2015-04-13 06:02:02,618 GMT*7*PEGA0026*4045*100*
2015-04-13 06:02:02,618 GMT*7*PEGA0026*4045*100*
2015-04-13 06:02:02,619 GMT*7*PEGA0026*4045*100*
2015-04-13 06:02:02,621 GMT*7*PEGA0026*4045*100*
2015-04-13 06:02:02,621 GMT*7*PEGA0026*3492*100*
2015-04-13 06:02:14,865 GMT*7*PEGA0026*148*100*


Steps to Reproduce



There is no specific use case to reproduce this issue.

Root Cause



The root cause of this problem is in a third-party product. On reviewing the connection pool settings (defined at the Cluster scope, which means that all nodes in cluster shared a single pool of DB connections) it is found that Max Connections needs to be increased and Purge policy has to be changed so as to limit the impact of a single failed connection.

Resolution



This issue is resolved by making the following change to the operating environment:

Change the tuning to increase Max Connections and change the Purge policy so as to limit the impact of a single failed connection.

Published June 12, 2015 - Updated October 8, 2020

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