[HBASE-12058] [Umbrella] Reduce unnecessary object allocations

• Type: Umbrella
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Assignee: Unassigned
• Reporter: Andrew Kyle Purtell
• Created: 23/Sep/14 00:59
• Updated: 17/Jun/22 17:25
• Resolved: 11/Jun/22 20:53

Description

We should avoid unnecessary object allocation, especially in hot code paths. There are a number of simple refactorings we can do to reduce object allocation.

Sub-Tasks

• HRegion.applyFamilyMapToMemstore creates too many iterator objects.: Closed
• Replace enhanced for statement with basic for statement where possible: Closed
• Ensure LOG.isXXXEnabled() wrapper around LOG.XXX() calls: Closed
• Fix usage of Collections.toArray: Closed
• FilterLists create many ArrayList$Itr objects per row.: Closed
• In ZKSplitLog Coordination and AggregateImplementation replace enhaced for statements with basic for statement to avoid unnecessary object allocation: Closed
• RegionCoprocessorHost.execOperation creates too many iterator objects: Closed