[HBASE-13529] Procedure v2 - WAL Improvements

• Type: Sub-task
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.1.0, 2.0.0
• Fix Version/s: 1.1.0, 2.0.0
• Component/s: proc-v2
• Assignee: Matteo Bertozzi
• Reporter: Matteo Bertozzi
• Created: 22/Apr/15 10:50
• Updated: 29/Aug/15 04:20
• Resolved: 24/Apr/15 09:02

Description

from the discussion in HBASE-12439 the wal was resulting slow.

• there is an error around the awake of the slotCond.await(), causing more wait then necessary
• ArrayBlockingQueue is dog slow, replace it with ConcurrentLinkedQueue
• roll the wal only if reaches a threshold (conf ops) to amortize the cost
• hsync() is used by default, when the normal wal is using just hflush() make it tunable via conf