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https://issues.apache.org/jira/browse/HDFS-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629244#comment-13629244
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Kihwal Lee commented on HDFS-4477:
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>there will be much consistency or security issues since they are expired ones.
Sorry. it should be "there won't be".
> Secondary namenode may retain old tokens
> ----------------------------------------
>
> Key: HDFS-4477
> URL: https://issues.apache.org/jira/browse/HDFS-4477
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: security
> Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0
> Reporter: Kihwal Lee
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HDFS-4477.patch, HDFS-4477.patch, HDFS-4477.patch,
> HDFS-4477.patch
>
>
> Upon inspection of a fsimage created by a secondary namenode, we've
> discovered it contains very old tokens. These are probably the ones that were
> not explicitly canceled. It may be related to the optimization done to avoid
> loading fsimage from scratch every time checkpointing.
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