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At least once of the following messages in seen in the application server log:
com.appiancorp.kougar.driver.exceptions.SafeRetryException: Unable to acquire a Read connection. Safe to retry.
com.appiancorp.kougar.driver.exceptions.SafeRetryException: Unable to acquire a Write connection. Safe to retry.
This message indicates that a particular engine received a request to do something, but did not receive a response within an acceptable time frame. This error is often seen when starting up an environment. It can also be seen at other times when the environment is already up and running, but there is a high load on the system. Any of the following are reasons why this message could be seen in the logs:
Run the checkengine script to diagnose any potential engine related issues and work to resolve them based on the documentation: <APPIAN_HOME>/server/_scripts/diagnostic/checkengine.bat|.sh.
<APPIAN_HOME>/server/_scripts/diagnostic/checkengine.bat|.sh
Run the status script to diagnose any potential engine related issues and work to resolve them based on the documentation: <APPIAN_HOME>/services/bin/status.bat|.sh.
<APPIAN_HOME>/services/bin/status.bat|.sh
This article applies to all versions of Appian.
Last Reviewed: December 2017