Cloning of a channel with thousands of packages fails with "500 Internal Server Error"

SUSE Manager 5.0 Server

Cloning a channel with high number of packages (e.g. RES-AS 8 channel with 35601 packages) from webUI, the webpage remains loading after several hours.

If such a channel is cloned from command line interface, it fails with "500 Internal Server Error" error.

uyuni-server:# spacecmd
Welcome to spacecmd, a command-line interface to Spacewalk.
Type: 'help' for a list of commands
'help <cmd>' for command-specific help
'quit' to quit
Spacewalk Username: admin
Spacewalk Password:
INFO: Connected to http://localhost/rpc/api as admin spacecmd {SSM: 0}> software channel_clonetree
Source Channels:
rhel8-pool-x86_64
Select source channel: rhel8-pool-x86_64 Prefix: clone-
Copy source channel GPG details? [y/N]: y
Original State (No Errata) [y/N]: N
INFO: Cloning rhel8-pool-x86_64 as clone-rhel8-pool-x86_64 INFO: Cloning res-8-updates-x86_64 as clone-res-8-updates-x86_64
INFO: Cloning res-as-8-updates-x86_64 as clone-res-as-8-updates-x86_64 ERROR: <ProtocolError for localhost/rpc/api: 500 Internal Server Error>

Increase the Java memory by edit /etc/rhn/rhn.conf and appending this parameter:

taskomatic.java.maxmemory=8192

Restart spacewalk-service status:

# spacewalk-service restart

Not enough dedicated java memory to clone a channel with the high number of packages.