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From "Hu Liu, (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7056) Snapshot support for truncate
Date Tue, 04 Nov 2014 07:21:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14195830#comment-14195830
] 

Hu Liu, commented on HDFS-7056:
-------------------------------

Hi [~shv],

Thanks for your comments. It's glad to see your patch.
Actually Guo and I have finished the POC for this several months ago. But we couldn't open
source it due to legal issue of company.

 

> Snapshot support for truncate
> -----------------------------
>
>                 Key: HDFS-7056
>                 URL: https://issues.apache.org/jira/browse/HDFS-7056
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Konstantin Shvachko
>            Assignee: Plamen Jeliazkov
>         Attachments: HDFS-7056.patch, HDFSSnapshotWithTruncateDesign.docx
>
>
> Implementation of truncate in HDFS-3107 does not allow truncating files which are in
a snapshot. It is desirable to be able to truncate and still keep the old file state of the
file in the snapshot.



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