[jira] [Commented] (HBASE-14706) RegionLocationFinder should return multiple servername by top host

["Guanghao Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-14706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14981681#comment-14981681 ] 

Guanghao Zhang commented on HBASE-14706:
----------------------------------------

Attach a new patch with ut for RegionLocationFinder.

> RegionLocationFinder should return multiple servername by top host
> ------------------------------------------------------------------
>
>                 Key: HBASE-14706
>                 URL: https://issues.apache.org/jira/browse/HBASE-14706
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 2.0.0, 1.2.0, 1.3.0
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-14706-trunk_v1.patch, HBASE-14706.patch
>
>
> Multiple RS can run on the same host. But in current RegionLocationFinder, mapHostNameToServerName map one host to only one server. This will make LocalityCostFunction get wrong locality about region.
> {code}
>     // create a mapping from hostname to ServerName for fast lookup
>     HashMap<String, ServerName> hostToServerName = new HashMap<String, ServerName>();
>     for (ServerName sn : regionServers) {
>       hostToServerName.put(sn.getHostname(), sn);
>     }
> {code}



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