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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HDFS-14118) Use DNS to resolve Namenodes and Routers
Date Fri, 01 Feb 2019 06:48:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758026#comment-16758026

Íñigo Goiri commented on HDFS-14118:

Sorry for the delay, I got stuck with HDFS-14249.
I tried to avoid the RuntimeException as much as possible but I had to have one at the end.
We may want to add negative cases to the tests too.

> Use DNS to resolve Namenodes and Routers
> ----------------------------------------
>                 Key: HDFS-14118
>                 URL: https://issues.apache.org/jira/browse/HDFS-14118
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Fengnan Li
>            Assignee: Fengnan Li
>            Priority: Major
>         Attachments: DNS testing log, HDFS-14118.001.patch, HDFS-14118.002.patch, HDFS-14118.003.patch,
HDFS-14118.004.patch, HDFS-14118.005.patch, HDFS-14118.006.patch, HDFS-14118.007.patch, HDFS-14118.008.patch,
HDFS-14118.009.patch, HDFS-14118.010.patch, HDFS-14118.011.patch, HDFS-14118.012.patch, HDFS-14118.patch
> Clients will need to know about routers to talk to the HDFS cluster (obviously), and
having routers updating (adding/removing) will have to make every client change, which is
a painful process.
> DNS can be used here to resolve the single domain name clients knows to a list of routers
in the current config. However, DNS won't be able to consider only resolving to the working
router based on certain health thresholds.
> There are some ways about how this can be solved. One way is to have a separate script
to regularly check the status of the router and update the DNS records if a router fails the
health thresholds. In this way, security might be carefully considered for this way. Another
way is to have the client do the normal connecting/failover after they get the list of routers,
which requires the change of current failover proxy provider.

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