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https://issues.apache.org/jira/browse/HADOOP-15419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16456916#comment-16456916
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Erik Krogen commented on HADOOP-15419:
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[~Tao Jie], I echo [~hexiaoqiao]'s concerns. Your recent proposal sounds like
it is defeating the point of ViewFS, which is to hide the physical location
details of data. If you have to be aware of physical locations of all of the
data you are reading, and set configurations accordingly, it seems to me that
you have lost the advantages of ViewFS. If you aware you are only using a
single physical cluster, why not just bypass ViewFS and use the URI directly..?
> Should not obtain delegationTokens from all namenodes when using ViewFS
> -----------------------------------------------------------------------
>
> Key: HADOOP-15419
> URL: https://issues.apache.org/jira/browse/HADOOP-15419
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.0.2
> Reporter: Tao Jie
> Priority: Major
>
> Today when submit a job to a viewfs cluster, the client will try to obtain
> delegation token from all namenodes under the viewfs while only one namespace
> is actually used in this job. It would create many unnecessary rpc call to
> the whole cluster.
> In viewfs situation, we can just obtain delegation token from specific
> namenode rather than all namenodes.
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