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Description

A timing issue in the vCenter event collector can cause duplicate relationships to be created. For example, if events for the creation and reconfiguration of the same VM arrive at virtually the same instant, the system creates duplicate relationships in the cmdb_rel_ci table. The identification engine considers this to be an error and refuses to identify the related CIs.

Steps to Reproduce

  1. Start the vCenter event collector on a busy vCenter.
        Pick a vCenter on which VMs are frequently created and destroyed.
  2. Let the vCenter collect events for a few days.
  3. Search for duplicate relationships between a VM and its datacenter.
  4. Attempt to perform an action in CMP that requires identification of that VM.

Workaround

Use the attached business rule that runs on the cmdb_rel_ci table to prevent creation of duplicate relationships. Because this table experiences a high number of inserts, the business rule can impact performance. However, no significant degradation is expected, because this business rules does not take nearly as long to complete as do others running on the cmdb_rel_ci table.

Note: This business rule could cause problems with custom code that creates or requires (probably unintentionally) duplicate relationships.  The default ServiceNow platform does not contain such code.


Related Problem: PRB1293839

Seen In

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Intended Fix Version

Madrid Patch 6
New York

Safe Harbor Statement

This "Intended Fix Version" information is meant to outline ServiceNow's general product direction and should not be relied upon in making a purchasing decision. The information provided here is for information purposes only and may not be incorporated into any contract. It is not a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remains at ServiceNow's sole discretion.

Associated Community Threads

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Article Information

Last Updated:2019-07-15 21:30:44
Published:2019-06-17