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Posted to issues@hbase.apache.org by "huaxiang sun (JIRA)" <ji...@apache.org> on 2016/07/25 05:50:20 UTC

[jira] [Work started] (HBASE-16275) Change ServerManager#onlineServers from ConcurrentHashMap to ConcurrentSkipListMap

     [ https://issues.apache.org/jira/browse/HBASE-16275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HBASE-16275 started by huaxiang sun.
--------------------------------------------
> 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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