APSV client returns "No connections available to process request."; request should queue not fail

Given an instance with 1 agent, and not enough sessions to handle the incoming requests, a client may get an error - "No connections available to process request." - while waiting for the agent and its sessions to start up. This can be reproduced when the session startup takes some time.

Jul 27, 2023
Knowledge

Title

URL Name

Network-exception-occurred-processing-request-com-progress-appserv-broker-exception-BrokerException-NetworkException

Article Number

000198613

Environment

Product: Progress Application Server (PASOE) Version:11.7.x, 12.x OS: All supported platforms Other:

Question/Problem Description

Steps to Reproduce

For the server/instance: create an instance, and configure the agent and session initial values [AppServer.SessMgr.ifds] numInitialAgents=1 maxABLSessionsPerAgent=5 maxConnectionsPerAgent=5 [AppServer.Agent.ifds] sessionStartupProc=session_start.p sessionStartupProcParam=15 numInitialSessions=5 Save the attached session_start.p and server.p into the openedge/ folder /* session_start.p BEGINS */ define input parameter pcArgs as character no-undo. pause integer(pcArgs) no-message. catch e as Progress.Lang.Error: message e:GetMessage(1). end catch. /* session_start.p ENDS */ /* server.p BEGINS */ BLOCK-LEVEL ON ERROR UNDO, THROW. DEFINE INPUT PARAMETER pParam AS CHARACTER NO-UNDO. output to value(session:temp-dir + 'server-' + pParam + '.log'). pause 2 no-message. finally: output close. end finally. /* server.p ENDS */ Start the instance and wait for the sessions to all start. For the client Save the attached client.p and runner.sh somewhere. /* client.p BEGINS */ BLOCK-LEVEL ON ERROR UNDO, THROW. DEFINE VARIABLE hAS AS HANDLE NO-UNDO. DEFINE VARIABLE retVal AS LOGICAL NO-UNDO. log-manager:logfile-name = session:temp-dir + 'client-' + session:param + '.log'. log-manager:clear-log(). create server hAS. retVal = hAS:Connect('-URL http://hostname:51890/apsv -sessionModel Session-Free'). if not retVal then log-manager:write-message('unable to connect', 'CLT:' + session:param). else do: log-manager:write-message('connected', 'CLT:' + session:param). run server.p on hAS (input session:param). log-manager:write-message('run completed', 'CLT:' + session:param). end. catch e as Progress.Lang.Error: log-manager:write-message('error: ' + e:getmessage(1), 'CLT:' + session:param). undo, throw e. end catch. finally: if hAS:connected() then do: retVal = hAS:disconnect(). log-manager:write-message('disconnected', 'CLT:' + session:param). end. delete object hAS. end finally. /* client.p ENDS */ Make sure runner.sh is executable. # runner.sh BEGINS # #! /bin/bash export DISPBANNER=no bpro -p client-ifds.p -param 01 & bpro -p client-ifds.p -param 02 & bpro -p client-ifds.p -param 03 & bpro -p client-ifds.p -param 04 & bpro -p client-ifds.p -param 05 & bpro -p client-ifds.p -param 06 & bpro -p client-ifds.p -param 07 & bpro -p client-ifds.p -param 08 & bpro -p client-ifds.p -param 09 & bpro -p client-ifds.p -param 10 & # runner.sh ENDS # Edit the .p and update line 31 with the appropriate instance host & port Run the runner.sh script. This runs 10 clients. The server only has capacity for 5 (on the first agent), and starting new sessions takes ~15sec each. You should see the reported error in the terminal. If no errors are raised, kill an agent and run it again. There should be errors in the client-*.log files.

Clarifying Information

Error Message

Defect Number

OCTA-32347

Enhancement Number

Cause

The exact cause is not known at this time.

Resolution

None at this time.

Workaround

Allow more sessions per agents and/or add more agents and/or improve the performance of the session's startup procedure.

Notes

Keyword Phrase

Last Modified Date

7/27/2023 4:46 PM

APSV client returns "No connections available to process request."; request should queue not fail

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APSV client returns "No connections available to process request."; request should queue not fail

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