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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4477) Secondary namenode may retain old tokens
Date Thu, 11 Apr 2013 19:22:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629249#comment-13629249
] 

Kihwal Lee commented on HDFS-4477:
----------------------------------

bq. As long as the same one thread is calling logExpireDelegationToken(), no further locking
is necessary.

I feel a bit unconfortable about this. If we cannot guaranty/enforce this, the namespace lock
should be acquired before calling logExpireDelegationToken().  If we can check the thread
identity of the caller in this method, we can avoid the locking.
                
> 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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