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Description of problem: pulp3 migration failed with "Katello::Errors::Pulp3Error: Cursor not found" error.


Version-Release number of selected component (if applicable):
6.9.z

How reproducible:
always with a specific database

Steps to Reproduce:
1. Prepare the 6.9.z setup using the upgrade template.
2. Run the pre-migration steps before running the upgrade for 6.10 snap5.
3. Applied the patch for BZ#1967131
4. run the pulp migration and it failed with "Katello::Errors::Pulp3Error: Cursor not found" error.

Actual results:
pulp3 migration failed with " Katello::Errors::Pulp3Error: Cursor not found" error.

Expected results:
pulp3 migration should be completed successfully.

Additional info:

What is the value of the CONTENT_PREMIGRATION_BATCH_SIZE in the /etc/pulp/settings.py

This happens sometimes on the slow I/O system (with HDD) and the batch for premigration should be decreased in such case.
If it's quite low already (e.g. 50), just re-run content prepare.

To be clear, there is nothing to be done here code wise. 

If a system runs into the problem, a pulp setting should be adjusted according to https://gist.github.com/jlsherrill/19003b646c9d4a1623da301e46ec2263 .
This is done, so the systems where I/O is fast enough, were able to benefit from faster migration.
A low default to the CONTENT_PREMIGRATION_BATCH_SIZE will make all systems to migrate sloooower.

This needs a KCS or docs change, what is the usual way of handling such things, tuning guide?

*** This bug has been marked as a duplicate of bug 1944317 ***