[HBASE-13497] Remove MVCC stamps from HFile when that is safe

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.2, 1.2.0, 1.1.1, 2.0.0
• Component/s: Scanners
• Labels: performance
• Hadoop Flags: Reviewed
• Assignee: Lars Hofhansl
• Reporter: Lars Hofhansl
• Created: 20/Apr/15 01:05
• Updated: 31/Aug/15 22:39
• Resolved: 01/May/15 00:11

Description

See discussion in HBASE-13389.
The optimization was initially put in with HBASE-8166, HBASE-12600 undoes it, this will partially restores it.

Instead of checking the MVCC readpoints against the oldest current scanner, we check that all are 0, if so, we do not need to write them.