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https://issues.apache.org/jira/browse/HDFS-14284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16937146#comment-16937146
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Íñigo Goiri commented on HDFS-14284:
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{quote}
do we have any advantage of having a RouterIOException, rather than directly 
calling super(msg + "from" + routerId); in the new constructors?
{quote}
It is easier to handle from the client side.
If we know is a subtype of RouterIOException we can just do getRouterId() 
instead of having to parse messages.
I think is a better design overall.

> RBF: Log Router identifier when reporting exceptions
> ----------------------------------------------------
>
>                 Key: HDFS-14284
>                 URL: https://issues.apache.org/jira/browse/HDFS-14284
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: hemanthboyina
>            Priority: Major
>         Attachments: HDFS-14284.001.patch
>
>
> The typical setup is to use multiple Routers through 
> ConfiguredFailoverProxyProvider.
> In a regular HA Namenode setup, it is easy to know which NN was used.
> However, in RBF, any Router can be the one reporting the exception and it is 
> hard to know which was the one.
> We should have a way to identify which Router/Namenode was the one triggering 
> the exception.
> This would also apply with Observer Namenodes.



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