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https://issues.apache.org/jira/browse/HBASE-14706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu reopened HBASE-14706:
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> RegionLocationFinder should return multiple servernames 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, 1.2.0, 1.3.0
>
> Attachments: HBASE-14706-branch-1.1.patch,
> HBASE-14706-trunk_v1.patch, HBASE-14706-trunk_v2.patch,
> HBASE-14706-trunk_v3.patch, HBASE-14706-trunk_v4.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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