[HBASE-14017] Procedure v2 - MasterProcedureQueue fix concurrency issue on table queue deletion

• Type: Sub-task
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.2.0, 1.1.1, 1.3.0, 2.0.0
• Fix Version/s: 1.2.0, 1.1.2, 2.0.0
• Component/s: proc-v2
• Assignee: Matteo Bertozzi
• Reporter: Matteo Bertozzi
• Created: 03/Jul/15 00:41
• Updated: 17/Jun/22 18:15
• Resolved: 06/Jul/15 21:07

Description

syuanjiang found a concurrecy issue in the procedure queue delete where we don't have an exclusive lock before deleting the table

Thread 1: Create table is running - the queue is empty and wlock is false 
Thread 2: markTableAsDeleted see the queue empty and wlock= false
Thread 1: tryWrite() set wlock=true; too late
Thread 2: delete the queue
Thread 1: never able to release the lock - NPE when trying to get the queue