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https://issues.apache.org/jira/browse/HDFS-984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12835644#action_12835644
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Jitendra Nath Pandey commented on HDFS-984:
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> Can you please explain the use-case why these need to be persisted?
Delegation tokens are used by tasks to authenticate with namenode. If
namenode restarts and looses information for previously issued delegation
tokens, the running tasks will not be able to connect to the namenode.
The scope of this jira is limited to delegation tokens issued by namenode.
The delgation tokens in MR issued by JT are not being persisted.
> Delegation Tokens should be persisted in Namenode
> -------------------------------------------------
>
> Key: HDFS-984
> URL: https://issues.apache.org/jira/browse/HDFS-984
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Jitendra Nath Pandey
> Assignee: Jitendra Nath Pandey
> Attachments: HDFS-984.7.patch
>
>
> The Delegation tokens should be persisted in the FsImage and EditLogs so that
> they are valid to be used after namenode shutdown and restart.
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