[
https://issues.apache.org/jira/browse/HADOOP-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622377#action_12622377
]
Tsz Wo (Nicholas), SZE commented on HADOOP-3941:
------------------------------------------------
How about we add the following optional method in the FileSystem API?
{code}
//a new optional method in FileSystem.java
public abstract FileChecksum getFileChecksum(String algorithm, Path p);
{code}
where FileChecksum is a new interface in hadoop.fs package
{code}
interface FileChecksum {
String getAlgorithm();
int getLength();
byte[] getBytes();
}
{code}
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
