[Freeipa-devel] [freeipa PR#5071][opened] 389-DS BDB: switch deadlock behavior to DB_LOCK_MINWRITE

[fcami]

   URL: https://github.com/freeipa/freeipa/pull/5071
Author: fcami
 Title: #5071: 389-DS BDB: switch deadlock behavior to DB_LOCK_MINWRITE
Action: opened

PR body:
"""
Some IPA updates are expensive in term of processing and #page hit.
The likelihood to generate a DS Berkeley DB database deadlock can be high
for some common operations.

When a deadlock is detected one deadlocking thread needs to be
rejected to let the other(s) complete.
DB_LOCK_YOUNGEST (9) is the DS default: it  means the most recent operation
fails in favor to the oldest one.
DB_LOCK_MINWRITE (6) means the reader(s) are rejected in favor
of the writers even if the reader(s) are older.

Switch the default for FreeIPA to DB_LOCK_MINWRITE for new installs and
also existing installs at update time.
This depends on the backend redesign (https://pagure.io/389-ds-base/issue/49476)
and therefore is valid on 389-DS 1.4.2.3 and higher.

Explanation provided by Thierry Bordaz.

Fixes: https://pagure.io/freeipa/issue/8479
Signed-off-by: François Cami <fcami(a)redhat.com&gt;
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5071/head:pr5071
git checkout pr5071