[HBASE-7163] Low-hanging perf improvements in HBase client

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Assignee: Unassigned
• Reporter: Karthik Ranganathan
• Created: 14/Nov/12 23:12
• Updated: 14/Jun/22 22:28
• Resolved: 29/Jun/16 19:05

Description

1. Change cachedRegionsLocations in HConnectionManager from SoftValueSortedMap to ConcurrentSkipListMap:
This change saves 15% CPU on the client side per profiling. In using the ConcurrentSkipListMap, we can do:
tableLocations.floorEntry(row).getValue()

instead of doing:
SortedMap<byte[], HRegionLocation> matchingRegions =
tableLocations.floorEntry(row).getValue();
if (!matchingRegions.isEmpty()) {
HRegionLocation possibleRegion =
matchingRegions.get(matchingRegions.lastKey());
}

2. NetUtils.getDefaultSocketFactory is very inefficient, use