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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14706) RegionLocationFinder should return multiple servernames by top host
Date Wed, 04 Nov 2015 23:46:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14990738#comment-14990738
] 

Hudson commented on HBASE-14706:
--------------------------------

SUCCESS: Integrated in HBase-1.3-IT #294 (See [https://builds.apache.org/job/HBase-1.3-IT/294/])
HBASE-14706 RegionLocationFinder should return multiple servernames by (tedyu: rev 6c239f18161d22783bc0054c7c1b29536467d634)
* hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRegionLocationFinder.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/RegionLocationFinder.java


> 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-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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