Bug 1989378

Description of problem: Pulp migration failed with " Katello::Errors::Pulp3Error: out of memory"


Version-Release number of selected component (if applicable):
6.9.4

How reproducible:
1/1

Steps to Reproduce:
1. Prepare the 6.9.z setup using the upgrade template.
2. Run the pulp migration.
3. Pulp migration fails with error "Katello::Errors::Pulp3Error: out of memory"

# satellite-maintain content prepare
Running Prepare content for Pulp 3
================================================================================
Start applicable services:
.............
.............
 2021-08-02 17:10:18 -0400: Pre-migrating Pulp 2 rpm content (detail info) 40000/104731Migration failed, You will want to investigate: https://xyz.com/foreman_tasks/tasks/ef60cce8-7d2e-4e52-b9ea-71dab48aa533
 rake aborted!
 ForemanTasks::TaskError: Task ef60cce8-7d2e-4e52-b9ea-71dab48aa533: Katello::Errors::Pulp3Error: out of memory
 DETAIL:  Failed on request of size 325522239 in memory context "ErrorContext".
 /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.18.1.33/lib/katello/tasks/pulp3_migration.rake:35:in `block (2 levels) in <top (required)>'
 /opt/rh/rh-ruby25/root/usr/share/gems/gems/rake-12.3.3/exe/rake:27:in `<top (required)>'
 Tasks: TOP => katello:pulp3_migration
 (See full trace by running task with --trace)
                                                                       [31m[1m[FAIL][0m                                   
 Failed executing foreman-rake katello:pulp3_migration, exit status 1
 --------------------------------------------------------------------------------
 Scenario [Prepare content for Pulp 3] failed.
 
 The following steps ended up in failing state:
 
   [content-prepare]
 
 Resolve the failed steps and rerun
 the command. In case the failures are false positives, 
 use --whitelist="content-prepare"
 

Actual results:
Pulp migration failed with the error " Katello::Errors::Pulp3Error: out of memory"

Expected results:
Pulp migration should be completed successfully.

Additional info: The setup has 20 GB RAM and 6 CPUs.