Recently we have been noticing the following type of errors in the application-s

Todd Tran

Certified Associate Developer

over 8 years ago

Recently we have been noticing the following type of errors in the application-server.log file "Unable to acquire a Read connection..." and "Unable to acquire a Write connection...". This type of errors only appear in our Appian 7.3 PROD environment. The ones related to "evaluating expression" are more critical because they would stop the node execution and process flow, we need to manually restart the node to continue the process instance flow. Below is the error details:

Details: ERROR:An error occurred while evaluating expression: SigImagesDocument : if ( pv!apr_super_index > 0 , if ( isnull ( #"0000cd79-25d0-8000-73cd-0a000064044c" ( pv!apr_users [ pv!apr_super_index ] ) ) ,
append ( pv!SigImagesDocument , #"0000cd79-3ecd-8000-73cd-0a000064044c" ) , append ( pv!SigImagesDocument , #"0000cd79-25d0-8000-73cd-0a000064044c" ( pv!apr_users [ pv!apr_super_index ] ) ) ) , pv!SigImagesDocument )
(Expression evaluation error in rule 'getdocumentid'...

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0 Todd Tran
Certified Associate Developer
over 8 years ago

... (called by rule 'getsignaturedocid') at function 'document': Error evaluating function 'document' : com.appiancorp.kougar.driver.exceptions.SafeRetryException: Unable to acquire a Read connection. Safe to retry. ) (Data Outputs)
Recommended Action: Check the expression including any function requirements and resume.

This type of errors did not go away after we tried the following:
Cold rebooted the server - all services stopped and started smoothly w/o any issues. Turned off McAfee services. Confirmed Server resources are good. Our exec kdbs are around 4.5G.

Any information to help us troubleshoot and resolve this issue would be greatly appreciated.
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0 Todd Tran
Certified Associate Developer
over 8 years ago

... (called by rule 'getsignaturedocid') at function 'document': Error evaluating function 'document' : com.appiancorp.kougar.driver.exceptions.SafeRetryException: Unable to acquire a Read connection. Safe to retry. ) (Data Outputs)
Recommended Action: Check the expression including any function requirements and resume.

This type of errors did not go away after we tried the following:
Cold rebooted the server - all services stopped and started smoothly w/o any issues. Turned off McAfee services. Confirmed Server resources are good. Our exec kdbs are around 4.5G.

Any information to help us troubleshoot and resolve this issue would be greatly appreciated.
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