Upgrade task troubleshooting
When you upgrade Jira Software or Jira Service Desk Data Center using zero downtime upgrades, and depending on what version you're upgrading to, your instance may need to run upgrade tasks on your data. Occasionally, these upgrade tasks will fail to complete, or fail to run correctly. This can be for a variety of reasons. For general troubleshooting, we suggest you review your logs to locate the potential problem.