[HBASE-12388] Document that WALObservers don't get empty edits.

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.99.2
• Component/s: wal
• Hadoop Flags: Reviewed
• Assignee: Sean Busbey
• Reporter: Sean Busbey
• Created: 30/Oct/14 21:53
• Updated: 06/Apr/18 17:54
• Resolved: 31/Oct/14 02:33

Description

in branch-1+, WALObservers don't get any notice of WALEdits that return true for isEmpty().

Make sure this is noted in the docs. It was surprising while I was writing a test, and it's a different edge case than in 0.98.