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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15774) Discovery of HA servers
Date Thu, 20 Sep 2018 06:13:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16621558#comment-16621558
] 

Yiqun Lin commented on HADOOP-15774:
------------------------------------

This looks very interesting! I did a quick look for the design doc, some aspects I am concerning
and maybe described more in the doc:
 * Once server addresses are updated, how sever manager plan to do and lets works known?
 * For the workers, do they need to get server address every time when they ask for a request
for servers? Or they will just get the address once and cached the it in itself?

> Discovery of HA servers
> -----------------------
>
>                 Key: HADOOP-15774
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15774
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Íñigo Goiri
>            Priority: Major
>         Attachments: Discovery Service.pdf
>
>
> Currently, Hadoop relies on configuration files to specify the servers.
> This requires maintaining these configuration files and propagating the changes.
> Hadoop should have a framework to provide discovery.
> For example, in HDFS, we could define the Namenodes in a shared location and the DNs
would use the framework to find the Namenodes.



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