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Posted to issues@hbase.apache.org by "Allan Yang (JIRA)" <ji...@apache.org> on 2019/02/01 07:05:00 UTC

[jira] [Commented] (HBASE-18495) [AMv2] Make methods isServerOnline() and isServerDead() in ServerManager mutually exclusive

    [ https://issues.apache.org/jira/browse/HBASE-18495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758032#comment-16758032 ] 

Allan Yang commented on HBASE-18495:
------------------------------------

Why isServerOnline() and isServerDead()  can be both true? I think it is a bug. 
As for the exclusive, there is a gray area that a dead server has already been processed(or processing but master restarts), so it will not be online and not in ServerDead either. 

> [AMv2] Make methods isServerOnline() and isServerDead() in ServerManager mutually exclusive
> -------------------------------------------------------------------------------------------
>
>                 Key: HBASE-18495
>                 URL: https://issues.apache.org/jira/browse/HBASE-18495
>             Project: HBase
>          Issue Type: Bug
>          Components: amv2
>    Affects Versions: 2.0.0
>            Reporter: Umesh Agashe
>            Assignee: Umesh Agashe
>            Priority: Major
>             Fix For: 3.0.0, 2.3.0
>
>
> During debugging HBASE-18366, it was found that ServerManager.isServerOnline() and ServerManager.isServerDead() can return true at the same time. This causes problems with the code depending on which method is used. Making them mutually exclusive seems line right thing to do.



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