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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-2655) Copy on write for data and metadata files in the presence of snapshots
Date Mon, 25 Feb 2008 21:22:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12572242#action_12572242
] 

shv edited comment on HADOOP-2655 at 2/25/08 1:21 PM:
----------------------------------------------------------------------

- FSDataset.detachBlock()
Variables "file" and "vol" are not used anymore.
- TestFileAppend: redundant import DSDataImputStream
- +1 other than that.

      was (Author: shv):
    - FSDataset.detachBlock()
Variables "file" and "vol" are not used anymore.
- +1 other than that.
  
> Copy on write for data and metadata files in the presence of snapshots
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-2655
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2655
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.17.0
>
>         Attachments: copyOnWrite.patch, copyOnWrite.patch, copyOnWrite2.patch, copyOnWrite3.patch
>
>
> If a DFS Client wants to append data to an existing file (appends, HADOOP-1700) and a
snapshot is present, the Datanoed has to implement some form of a copy-on-write for writes
to data and meta data files.

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