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https://issues.apache.org/jira/browse/HBASE-7163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498416#comment-13498416
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Karthik Ranganathan commented on HBASE-7163:
--------------------------------------------

@Ted - yes that's the part, fix has another component to it though. Also, 
changed this task to add one more perf improvement.
                
> Low-hanging perf  improvements in HBase client
> ----------------------------------------------
>
>                 Key: HBASE-7163
>                 URL: https://issues.apache.org/jira/browse/HBASE-7163
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Karthik Ranganathan
>            Assignee: Karthik Ranganathan
>
> 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 

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