[HBASE-7868] HFile performance regression between 0.92 and 0.94

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.94.5
• Component/s: io
• Assignee: Unassigned
• Reporter: Matteo Bertozzi
• Created: 17/Feb/13 10:35
• Updated: 16/Jun/22 05:32
• Resolved: 06/Apr/15 19:22

Description

By HFilePerformanceEvaluation seems that 0.94 is slower then 0.92

Looking at the profiler for the Scan path, seems that most of the time, compared to 92, is spent in the metrics dictionary lookup. eclark pointed out the new per family/block metrics.

By commenting the metrics call in HFileReaderV2, the performance seems to get better, but maybe metrics is not the only problem.