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CMN_JGROUPS_PING table uuid does not list all services in 16.1.0+

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Article ID: 258341

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Updated On:

Products

Clarity PPM SaaS Clarity PPM On Premise

Issue/Introduction

After upgrade to 16.1.0, when we look in table CMN_JGROUPS_PING we see all entries with bg_CLRTY or app_CLRTY. Previously it was indicating each service.

Environment

Release : 16.1.0+

Resolution

This is a third party change introduced when JGroups was upgraded.

  • If you start the app first then it gets app_CLRTY.
  • It will indicate uuid as BG (bg_CLRTY) if BG was the first to start
  • If then you stop BG, then the remaining CLRTY cluster switches to use app_ as the prefix
  • If then we start the BG everything will have a prefix of app_.
  • JGroups is keeping track of what nodes join a group and is organizing them by uuid. The first one in the group sets the prefix.