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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14706) RegionLocationFinder should return multiple servername by top host
Date Wed, 04 Nov 2015 02:51:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14988789#comment-14988789
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Ted Yu commented on HBASE-14706:
--------------------------------

{code}
+ * Copyright 2010 The Apache Software Foundation
{code}
Year is not needed. Check other source file for standard license header.
{code}
+    // wait flush region
+    Thread.sleep(5000);
{code}
Can you find other approach instead of sleeping ?

> 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-trunk_v2.patch, HBASE-14706-trunk_v3.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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