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https://issues.apache.org/jira/browse/HBASE-16275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391248#comment-15391248
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Allan Yang commented on HBASE-16275:
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As you said, ‘’it seems that there is no difference if there are 1000
servers“”, so how many servers will the patch make some difference. As far as
I know, the biggest HBase cluster is still no more than several thousands
nodes. So I think this fix is trival
> Change ServerManager#onlineServers from ConcurrentHashMap to
> ConcurrentSkipListMap
> ----------------------------------------------------------------------------------
>
> Key: HBASE-16275
> URL: https://issues.apache.org/jira/browse/HBASE-16275
> Project: HBase
> Issue Type: Improvement
> Reporter: huaxiang sun
> Assignee: huaxiang sun
> Priority: Minor
> Attachments: HBASE-16275-v001.patch
>
>
> In Class ServerManager, onlineServers is declared as ConcurrentHashMap. In
> findServerWithSameHostnamePortWithLock(), it has to do a loop to find if
> there is a ServerName with same host:port pair. If replaced with
> ConcurrentSkipListMap, findServerWithSameHostnamePortWithLock() can be
> replaced with a O(logN) implementation.
> I run some performance comparison(test the function only), it seems that
> there is no difference if there are 1000 servers. With more servers,
> ConcurrentSkipListMap implementation is going to win big.
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