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https://issues.apache.org/jira/browse/HADOOP-15419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16457290#comment-16457290
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Tao Jie commented on HADOOP-15419:
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[~xkrogen] thank you for your comment. I understand your concerns. Actually I
don't want to break any existing logic or assumptions for viewfs. We just want
add another option for the user which somehow like a {{hint}} to viewfs which
could help to reduce request to the cluster.
> 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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