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Status Not under consideration
Workspace z/TPF Product Family
Categories z/TPFDF
Created by Guest
Created on Mar 28, 2014

RELATED IDEAS

Provide a means for CRUISE to recover from a hang or deadlock condition

Provide a means for CRUISE to recover from a hang or deadlock condition. A running CRUISE table has the potential to hang or get stuck in a sort of deadlock situation. The maximum allowed ECB's have already been created. One or more ECB's may need to create additional ECB's. However, no ECB's can exit because each needs to create at least 1 more ECB to continue, complete and exit A kind of deadlock condition develops as each ECB is spinning in a DEFRC loop, each waiting for another ECB to complete, but none can. Some mechanism needs to be provided to recover from this type of deadlock.

Idea priority Low
  • Guest
    Reply
    |     Oct 14, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/TPF

    For recording keeping, the previous attributes were:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - z/TPF

  • Guest
    Reply
    |     May 20, 2014

    We have a couple of concerns with this. First, the sample situations described in the requirement are completely different (exit dumps versus not enough system resources), and they potentially would result in different technical solutions to resolve. Second, the proposed solution (to have an entry to decrement the number of ECBs) is dangerous, can lead to unpredictable situations, and seems more like a "hack" than a long term solution to a potential issue. Third, letting CRUISE proceed to completion is not necessarily recommended in these cases because the results of a run when all ECBs have not correctly completed (or when the ECB count will no longer match the actual number of ECBs) cannot be trusted. As mentioned in the requirement, proper tuning eliminates this issue in most cases, and we also wanted to point out that if CRUISE hangs, this could represent a defect in the z/TPFDF product. For example, PK92771 was issued to address a hang condition in CRUISE several years ago.

    For all of these reasons and due to resources and priority, IBM does not intend to do this in the forseeable future.

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