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@redhat.com """

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