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Status Not under consideration
Workspace CICS Transaction Server for z/OS
Categories Runtime
Created by Guest
Created on Sep 16, 2019

RELATED IDEAS

CPSM API Timeout/Retry if MAS cycling

CPSM API programs throw an error if a MAS is cycling since the state of the MAS is indeterminate and CPSM times out waiting for a response. The timeout error causes our API program to fail. We would like the CPSM API to be more tolerant of transitory state changes of a MAS and to not throw an error just because a MAS is starting or stopping. Perhaps an internal RETRY mechanism if the region stopped responding, or better coordination between CPSM and the MAS regarding its state.

Idea priority High
  • Guest
    Reply
    |     Oct 22, 2019

    Although it appears as though the CPSM API response (ENVIRONERROR/REQTIMEOUT) has failed without data, the resultset is actually still valid and you should be able to find it populated with data from all regions apart from those that failed. Once the request has been issued, the worst CPSM API error detected while processing is usually flowed back through the CPSM API response, which is why a single region timing out, makes it appear that the whole response failed. Regardless though, if the request is sent the response will flow back through the API whether it is good or otherwise.

    The guidance for the GET API command does indeed state for the REQTIMEOUT reason value:
    "One of the CMASs or MASs to which the request was directed did not respond.
    If only some of the CMASs or MASs did not respond, the GET command can still yield a valid result. COUNT might be greater than zero and RESULT might be non-zero. Such a result set contains data from those CMASs and MASs that did respond. "

    Additionally if you would like to find which system has failed and why, that information is available via the MASQRYER resource table records. See this KC topic for more information:
    https://www.ibm.com/support/knowledgecenter/en/SSGMCP_5.5.0/system-programming/cpsm/retrieving_masqryer_records.html

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