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https://issues.apache.org/jira/browse/HBASE-19917?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351247#comment-16351247
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Xiang Li commented on HBASE-19917:
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Uploaded the very first patch. All UT under hbase-rsgroup get passed on my
local machine. Running full UT.
> Improve RSGroupBasedLoadBalancer#filterServers() to be more efficient
> ---------------------------------------------------------------------
>
> Key: HBASE-19917
> URL: https://issues.apache.org/jira/browse/HBASE-19917
> Project: HBase
> Issue Type: Improvement
> Components: rsgroup
> Reporter: Xiang Li
> Assignee: Xiang Li
> Priority: Minor
> Attachments: HBASE-19917.master.000.patch
>
>
> {code:title=hbase-rsgroup/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java|borderStyle=solid}
> private List<ServerName> filterServers(Collection<Address> servers,
> Collection<ServerName> onlineServers) {
> ArrayList<ServerName> finalList = new ArrayList<ServerName>();
> for (Address server : servers) {
> for(ServerName curr: onlineServers) {
> if(curr.getAddress().equals(server)) {
> finalList.add(curr);
> }
> }
> }
> return finalList;
> }
> {code}
> filterServers is to return the union of servers and onlineServers. The
> current implementation has time complexity as O(m * n) (2 loops), could be in
> O(m + n) if HashSet is used. The trade-off is space complexity is increased.
> Another point which could be improved: filterServers() is only called in
> filterOfflineServers(). filterOfflineServers calls filterServers(Set, List).
> The current filterServers(Collection, Collection) seems could be improved.
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