[LU-14852] DIO append must be still locked

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Severity: 3
• Assignee: Shaun Tancheff
• Reporter: Vitaly Fertman

Description

as two appends may race, and in a case of partially applied and restarted IO must still apply fully ordered (AB or BA), but not with partially mixed data, DIO append still must be locked (have client side locking). it is not so once DIO became lockless in master.