Attempt to write vertex but there is already such a record written

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Article ID: 7386

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Updated On:

Products

APP PERF MANAGEMENT CA Application Performance Management Agent (APM / Wily / Introscope) CUSTOMER EXPERIENCE MANAGER INTROSCOPE

Issue/Introduction

Post upgrade from APM 9.7 to 10.5.1, now seeing the following [WARN] message in the Manager of Manager (MOM)'s IntroscopeEnterpriseManager.log:

[WARN] [AppMapAsyncExecutor-4] [Manager.AppMap] Attempt to write vertex (externalId = INFERRED_SOCKET:SOCKET:abc-vip:1521:abc-vip) at 2017-05-22 17:40:56.091, but there is already such a record written at 2017-05-22 17:41:04.593
[{"name":"agentHostName","value":"nzttsmsdux001","type":"GATHERED","owner":null},{"name":"hostname","value":"abc-vip","type":"GATHERED","owner":null},{"name":"inferredBackendNode","value":"true","type":"GATHERED","owner":null},{"name":"name","value":"SOCKET:abc-vip:1521","type":"GATHERED","owner":null},{"name":"type","value":"INFERRED_SOCKET","type":"GATHERED","owner":null}]
[{"name":"agentHostName","value":"def","type":"GATHERED","owner":null},{"name":"hostname","value":"abc-vip","type":"GATHERED","owner":null},{"name":"inferredBackendNode","value":"true","type":"GATHERED","owner":null},{"name":"name","value":"SOCKET:abc-vip:1521","type":"GATHERED","owner":null},{"name":"type","value":"INFERRED_SOCKET","type":"GATHERED","owner":null}]

Cause

The warning message indicates that agents are trying to add data to the APM Team Center, but the data had already been written. This is usually due to a time zone conflict between the MOM, collectors and Agents.

Environment

Application Performance Management 10.x

Resolution

To address this, make sure that the MOM and all Collectors are using the same time source to synchronize with (NTP). 

Additional Information