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Currently firewalld uses calls to the "nft" binary. This is slow and causes lots of forking. We should use the new libnftables JSON interface. This will allow batching and eliminate forking which will drastically speed up rule application.

This BZ is very important for corosync daemon to make reload of firewall possible without loosing packets and creating new cluster membership (more info - bug 1663588).

Upstream:

52e2becbf7d5 ("improvement: remove transaction flush for RFC3964_IPv4")
3f7419dcb50a ("chore: remove nft build dependency")
1582c5dd736a ("feat: nftables: convert to libnftables JSON interface")
e519f08d33fd ("chore: travis: no longer run testsuite")
3ea3aa7e1c4a ("chore: nftables: remove unused fill_exists() function")
ff713d793c02 ("improvement: if a transaction fails, dump traceback to debug")
a4fa472540b5 ("chore: fw: don't return anything from set_rules()")
719e239fbff1 ("fix: tests/regression/rhbz1601610: add missing CHECK_IPSET")

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1836