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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3941) Extend FileSystem API to return file-checksums/file-digests
Date Sun, 17 Aug 2008 10:19:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623183#action_12623183
] 

Doug Cutting commented on HADOOP-3941:
--------------------------------------

How about making FileChecksum an abstract class, adding the method:

public abstract equals(Object other);


> 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
>
> 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.

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