[HBASE-25015] PerformanceEvaluation with presplit randomWrite test has severe hotspotting

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.3.1
• Component/s: test
• Assignee: Unassigned
• Reporter: Nick Dimiduk
• Created: 11/Sep/20 17:17
• Updated: 25/Sep/20 22:50

Description

I'm attempting to apply a load to a small distributed cluster (12 RS). I use -presplit and specify 3 regions per region server. randomWrite test with -nomapred and 30 client threads. The result is severe hot-spotting on a single region region (10's of thousands of reqs/sec) and minimal load (high 10's to low 100's reqs/sec) to the others. It seems the split algorithm and the load generator do not agree on an even data distribution.