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https://issues.apache.org/jira/browse/HBASE-685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-685.
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    Resolution: Won't Fix

We now use concurrentskiplistmaps.

> [Performance] Alternative to synchronized SortedMap
> ---------------------------------------------------
>
>                 Key: HBASE-685
>                 URL: https://issues.apache.org/jira/browse/HBASE-685
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>
> Over in HBASE-684, LN suggests that we should find alternative to 
> synchronized sortedmap; its used all over the place in hbase so a faster 
> alternative should improve thoughput.  That synchronized sortedmap is less 
> than perfect has been known from earliest days (see cafarella comment at head 
> of HStore#internalGet in 0.1 branch.

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