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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8118) Delay in checkpointing Trash can leave trash for 2 intervals before deleting
Date Fri, 10 Apr 2015 01:29:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14488722#comment-14488722
] 

Harsh J commented on HDFS-8118:
-------------------------------

Does it make sense to not let the checkpoint time be equal to the clearing interval though?
I'm not certain what benefit comes out of it anyway.

> Delay in checkpointing Trash can leave trash for 2 intervals before deleting
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-8118
>                 URL: https://issues.apache.org/jira/browse/HDFS-8118
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Casey Brotherton
>            Priority: Trivial
>
> When the fs.trash.checkpoint.interval and the fs.trash.interval are set non-zero and
the same, it is possible for trash to be left for two intervals.
> The TrashPolicyDefault will use a floor and ceiling function to ensure that the Trash
will be checkpointed every "interval" of minutes.
> Each user's trash is checkpointed individually.  The time resolution of the checkpoint
timestamp is to the second.
> If the seconds switch while one user is checkpointing, then the next user's timestamp
will be later.
> This will cause the next user's checkpoint to not be deleted at the next interval.
> I have recreated this in a lab cluster 
> I also have a suggestion for a patch that I can upload later tonight after testing it
further.



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