[jira] [Updated] (HDFS-14118) Use DNS to resolve Namenodes and Routers

["Íñigo Goiri (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-14118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Íñigo Goiri updated HDFS-14118:
-------------------------------
    Attachment: HDFS-14118.012.patch

> 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.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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