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https://issues.apache.org/jira/browse/HADOOP-17342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227068#comment-17227068
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Jim Brennan commented on HADOOP-17342:
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Thanks [~ebadger]!
> Creating a token identifier should not do kerberos name resolution
> ------------------------------------------------------------------
>
> Key: HADOOP-17342
> URL: https://issues.apache.org/jira/browse/HADOOP-17342
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Affects Versions: 2.10.1, 3.4.0
> Reporter: Jim Brennan
> Assignee: Jim Brennan
> Priority: Major
> Fix For: 3.3.1, 3.4.0, 3.1.5, 2.10.2, 3.2.3
>
> Attachments: HADOOP-17342.001.patch
>
>
> This problem was found and fixed internally for us by [~daryn].
> Creating a token identifier tries to do auth_to_local short username
> translation. The authentication process creates a blank token identifier for
> deserializing the wire format. Attempting to resolve an empty username is
> useless work.
> Discovered the issue during fair call queue backoff testing. The readers are
> unnecessary slowed down by this bug.
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