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Posted to hdfs-issues@hadoop.apache.org by "Plamen Jeliazkov (JIRA)" <ji...@apache.org> on 2014/11/03 20:33:35 UTC

[jira] [Commented] (HDFS-7056) Snapshot support for truncate

    [ https://issues.apache.org/jira/browse/HDFS-7056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14194964#comment-14194964 ] 

Plamen Jeliazkov commented on HDFS-7056:
----------------------------------------

The editLogs in HDFS-3107 can be used for this patch as well. They don't need to be regenerated for this because those editLogs performed a truncate on the block boundary.

> 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
>         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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