Secondary Data Aggregator in a fault tolerance is not working properly

Products

• DX NetOps

Issue/Introduction

After a failover, when the secondary DA came online, things appeared to be working at first but on further investigation, the following was noticed:
 a. Sync failed
 b. DCs could not connect
 c. ../rest/devices showed ONLY the Data Aggregator
 d. DA karaf.log showed messages regarding issues reading iRep

WARN  | esponseHandler-1 | 2021-02-08 10:43:09,858 | AbstractPollResponse | re.common.AbstractPollResponse$1  658 | m.ca.im.data-mgmt.common |       | Attribute id 7731 does not exist in poll group 5315; DC out of sync?

ERROR | plyEnvSensorInfo | 2021-02-08 10:43:09,858 | ExceptionLog | .ca.im.core.util.ExceptionLogger  104 | m.ca.im.common.core.util |       | An existing application exception RECURRED (Key=246fb071054ab6b4476bfd95439d9c87744d096f), Recurrence count=9 : Look up requested for DCM ID hostname:dbd24d69-ea0f-4466-bede-7ff82c3e7b82 but iRep did not return any items. : For input string: "hostname:dbd24d69-ea0f-4466-bede-7ff82c3e7b82"

Cause

The Data Aggregator user was set differently for the Secondary Data Aggregator

Environment

Release : 20.2

Component : CA Performance Center

Resolution

The /opt/IMDataAggregator/apache-karaf-2.4.3/etc/dbconnection.cfg file should be the same between both Data Aggregators.  When the Secondary Data Aggregator is not running, copying the primary (working) dbconnection.cfg over the top of the secondary (not working) dbconnection.cfg should allow the Secondary Data Aggregator to start properly.