Incremental patches of vCenter Server 7.x fail with exception occurred in postInstallHook error

Products

• VMware vCenter Server

Issue/Introduction

Symptoms:

• Incremental patches of vCenter Server 7.x fail with the following error observed in /var/log/vmware/applmgmt/PatchRunner.log:
  

  Performing start operation on service vpxd.
  
  stderr: Error executing start on service vpxd. Details {
      "detail": [
          {
              "id": "install.ciscommon.service.failstart",
              "translatable": "An error occurred while starting service '%(0)s'",
              "args": [
                  "vpxd"
              ],
              "localized": "An error occurred while starting service 'vpxd'"
          }
      ],
      "componentKey": null,
      "problemId": null,
      "resolution": null
  }
  Service-control failed. Error: {
      "detail": [
          {
              "id": "install.ciscommon.service.failstart",
              "translatable": "An error occurred while starting service '%(0)s'",
              "args": [
                  "vpxd"
              ],
              "localized": "An error occurred while starting service 'vpxd'"
          }
      ],
      "componentKey": null,
      "problemId": null,
      "resolution": null
  }

  
  
  

Environment

VMware vCenter Server 7.0 U3c ( Build 19234570 ) or below

Cause

This is caused due to a race condition between vpxd and vcdb upgrade scripts. 

Resolution

This issue has been fixed on vCenter Server 7.0 Update 3d  (  7.0.3.00500  ) , build :19480866.
Update your vCenter Server to the above build or higher.