UDM Manager is not starting - Exception establishing Datomic connection: clojure.lang.ExceptionInfo: Key missing in storage

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

UDM probe is not working, and its effecting the discovery server.

UDM loglevel 5 logs has below messages:

Exception establishing Datomic connection: clojure.lang.ExceptionInfo: Key missing in storage {:tail "6de5cd4-38c1-4d12-b184-c16711db1e2c", :t nil, :v nil, :prev nil}

Mar 29 13:20:51:797 DEBUG [main, udm_manager] Calling Peer.createDatabase to establish Datomic connection.

Mar 29 13:20:51:824 DEBUG [main, udm_manager] Connecting to Datomic...

Environment

Release : 20.3

Component :UDM manager, discovery server

Resolution

Follow below steps:

1. Deactivate the udm_manager probe and when the values in the PID and port columns clear, then deactivate the data_engine probe. And discover server too.
2. Save off the current contents of the datomic_kvs table in the UIM database (in case analysis of this table is required), then drop this table:

SELECT * INTO bkup_datomic_kvs from datomic_kvs;

DROP TABLE datomic_kvs;

NOTE:  This table will be recreated and repopulated with the activation of the probes.

3. Activate data_engine, discovery_server and udm_manager probes