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https://issues.apache.org/jira/browse/HBASE-7163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13498639#comment-13498639
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stack commented on HBASE-7163:
------------------------------
Sounds right [~lhofhansl]
> 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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