hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3941) Extend FileSystem API to return file-checksums/file-digests
Date Tue, 26 Aug 2008 21:12:44 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE updated HADOOP-3941:
-------------------------------------------

    Attachment: 3941_20080826.patch

3941_20080826.patch:

- The default implementation is provided in the FileSystem class.
- It returns null when the algorithm is not found.
- Added FileLengthChecksum which uses file lengths as checksums

> Extend FileSystem API to return file-checksums/file-digests
> -----------------------------------------------------------
>
>                 Key: HADOOP-3941
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3941
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: fs
>            Reporter: Tsz Wo (Nicholas), SZE
>         Attachments: 3941_20080818.patch, 3941_20080819.patch, 3941_20080819b.patch,
3941_20080820.patch, 3941_20080826.patch
>
>
> Suppose we have two files in two locations (may be two clusters) and these two files
have the same size.  How could we tell whether the content of them are the same?
> Currently, the only way is to read both files and compare the content of them.  This
is a very expensive operation if the files are huge.
> So, we would like to extend the FileSystem API to support returning file-checksums/file-digests.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message