Skip to Main Content
IBM Data and AI Ideas Portal for Customers

This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (

Shape the future of IBM!

We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:

Search existing ideas

Start by searching and reviewing ideas and requests to enhance a product or service. Take a look at ideas others have posted, and add a comment, vote, or subscribe to updates on them if they matter to you. If you can't find what you are looking for,

Post your ideas

Post ideas and requests to enhance a product or service. Take a look at ideas others have posted and upvote them if they matter to you,

  1. Post an idea

  2. Upvote ideas that matter most to you

  3. Get feedback from the IBM team to refine your idea

Specific links you will want to bookmark for future use

Welcome to the IBM Ideas Portal ( - Use this site to find out additional information and details about the IBM Ideas process and statuses.

IBM Unified Ideas Portal ( - Use this site to view all of your ideas, create new ideas for any IBM product, or search for ideas across all of IBM. - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.

IBM Data & AI Roadmaps ( - Use this site to view roadmaps for Data & AI products.

IBM Employees should enter Ideas at

Status Delivered
Created by Guest
Created on Jun 23, 2021

Provide means to limit number of retries following unable to establish connection

This idea is related to real life scenario we encountered in production - we raised a case but we were advised CDC is working as designed and we should raise an AHA idea.

Currently we have a number of subscriptions defined/active across a number of our production z-Series sysplexes . The subscriptions are marked as persistent and this works well for us however in the scenario where a subscription encounters an issue attempting to reestablish connection to the target(in our case CDC kafka on Linux) CDC will queue retries but with no limit on the number of retries.

CDC issued warning messages CHC6453W/CHC9694W and queued a restart attempt after n minutes(in our case 5), however the number of retries is unlimited and nothing is written to CDC JESMSGLG - only to CHCPRINT.

Regardless of the root cause(which in our case required a restart of the target instance) we expect CDC on the source side to not queue an unlimited number of retries with no escalation to a hard error at some point and a message written to JESMSGLG.

We were advised there is no such capability for subscriptions marked persistent.

We made reference to handling of decompression errors where the is capability for subscriptions marked as persistent to have a finite number of retries following a log read error based on setting, for example, ONDECOMPRESSIONERROR=(60,STOP).

We accept this is not quite the same as an issue attempting to reestablish connection to a target instance but nonetheless we feel CDC on the source side should not be initiating a unlimited number of retries for any issue without at least issuing an error message at some point to JESMSGLG and giving up - this would permit customers to code an message rule for automation to alert the relevant support team to review and take the required actions.

As it stands there is an exposure that can result in replicating being down for many hours with no notification.

We are progressing heath check scripts as a backup to automated altering on specific CHC messages written to JESMSGLG but would greatly appreciate a correction to current logic of unlimited of retries.



Needed By Yesterday (Let's go already!)
  • Admin
    Aug 26, 2021

    Thanks for raising this IDEA. We have reviewed the suggestion and agree this is a valid requirement . It is currently in development and targetted for Q3 - '21 release.