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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3644) HServerAddress Violates Equivalence Relations
Date Tue, 15 Mar 2011 05:30:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006798#comment-13006798
] 

stack commented on HBASE-3644:
------------------------------

Does it help that HBASE-1502 is trying to strip out HServerAddress N?  Its adding in a new
ServerName instead, a carrier for the String hostname, the int port, and the long startcode.
 No DNS in the mix.  HBASE-1502 is about removing heartbeats but along the way deprecating
HSA and HServerInfo.

> HServerAddress Violates Equivalence Relations
> ---------------------------------------------
>
>                 Key: HBASE-3644
>                 URL: https://issues.apache.org/jira/browse/HBASE-3644
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.2, 0.92.0
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>             Fix For: 0.90.2, 0.92.0
>
>
> See HBASE-3387 or http://www.ibm.com/developerworks/java/library/j-jtp05273.html#N10184
.  Basically, 'a' denotes HServerAddress(DNS) & 'b' denotes HServerAddress(nslookup(DNS)).
 This is extremely common within HBase when 'conf/regionserver' contains DNS entries because
ClusterStatus.getServers() is IP-based. You have a.address.equals(b.address) && !a.stringValue.equals(b.stringValue).
 In this case, a.equals(b) while a.hashCode() != b.hashCode().  

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