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https://issues.apache.org/jira/browse/HBASE-16275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15404417#comment-15404417
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Hudson commented on HBASE-16275:
--------------------------------
FAILURE: Integrated in HBase-0.98-on-Hadoop-1.1 #1251 (See
[https://builds.apache.org/job/HBase-0.98-on-Hadoop-1.1/1251/])
HBASE-16275 Change ServerManager#onlineServers from ConcurrentHashMap to
(apurtell: rev 903e7d5f7a71055636b9ff8a8b48038659de7572)
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java
> 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
> Fix For: 2.0.0, 1.4.0, 0.98.21
>
> Attachments: HBASE-16275-v001.patch, HBASE-16275-v002.patch,
> TestServerManagerPerf.java
>
>
> 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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