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KB-2084 Engines fail to start following hotfix deployment or upgrade to Appian versions 19.2 / 19.3 / 19.4


In an On-premises environment, Appian engines fail to start following a hotfix deployment or version upgrade due to transaction replay error with the following message in the service_manager.log:

ERROR com.appian.komodo.translog.OutstandingRequestsTracker - Outstanding write requests was decremented again after the all writes logged event.


This is due to an issue with the Service Manager version on the following Appian build versions:

  • to
  • to
  • to

To verify the build version, check the file located in the <APPIAN_HOME>/conf/ directory.


Open a support case with Appian Technical Support to receive the fix for this issue and follow the instructions below to apply the fix:

  1. Download and unzip the file provided by Appian Support to any directory that is not <APPIAN_HOME>.
  2. Shutdown all components of Appian gracefully.
  3. Rename <APPIAN_HOME>/services/bin to <APPIAN_HOME>/services/bin_backup.
  4. Rename <APPIAN_HOME>/services/lib to <APPIAN_HOME>/services/lib_backup.
  5. From the unzipped file, copy the ‘bin’ directory into <APPIAN_HOME>/services.
  6. From the unzipped file, copy the ‘lib’ directory into <APPIAN_HOME>/services.
  7. Start the engines and associated services (Service Manager, Kafka, Zookeeper) on all engine nodes using the start script.
  8. Stop the engines and associated services on all engine nodes using the stop script
  9. Start Appian normally using the steps provided in our Starting and Stopping Appian documentation.

After completing Appian startup, follow the procedures below:

  1. Remove <APPIAN_HOME>/services/bin_backup.
  2. Remove <APPIAN_HOME>/services/lib_backup.

Affected Versions

This article applies to Appian 19.2, 19.3, and 19.4.

Last Reviewed: February 2020