Gateway Crash When Querying String Tag History from the Core Historian

The Issue

An issue was identified for Ignition 8.3.6 where querying tag history for String tags stored in the Core Historian would result in a JVM crash for the Ignition Gateway. This behavior was due to QuestDB being updated to version 9.3.5 for the Ignition 8.3.6 release.

This behavior can be reproduced if your tag history query meets ALL of the following criteria: 

• A String tag is being read from the Core Historian.
• One of the following aggregation modes is being used for your query:
  • Count
  • Last Value
  • Minimum
  • Maximum
  • Simple Average
  • Sum
  • Variance
  • Standard Deviation

It is also important to note that this issue was replicated using queries with the criteria listed above from Tag History Bindings, Reporting Module Data Sources, and system functions.

The Solution

A nightly release of the Tag Historian module has been publicly released to provide a fix for this issue if you choose to stay with Ignition 8.3.6. This update can be found under the our downloads page labeled Ignition Version 8.3.7-SNAPSHOT and by navigating to the Historian Core Module. Please refer to the information above if you suspect that your Gateway has been configured with the same criteria and do not wish to revert your Ignition Gateway version.