JIRA 4.4.3 Upgrade Notes
JIRA 4.4.3 fixes a critical issue in JIRA 4.4.2 (JRA-25914 which may cause data corruption in a high-load environment).
Upgrading from JIRA 4.4.x to 4.4.3
Please follow the instructions in the general upgrading JIRA documentation.
If you upgraded to JIRA 4.4.2, please upgrade to JIRA 4.4.3 as soon as possible. JIRA 4.4.3 includes an upgrade task that will fix any data corruption resulting from JRA-25914 (i.e. the creation of issues with duplicate keys in a high-load environment).