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https://issues.apache.org/jira/browse/HADOOP-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623184#action_12623184
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Doug Cutting commented on HADOOP-3941:
--------------------------------------
Sorry, that should have been something like:
{code}
public boolean equals(Object other) {
if (!(other instanceof FileChecksum))
return false;
FileChecksum that = (FileChecksum)other;
return this.getAlgorithm().equals(that.getAlgorithm())
&& this.getBytes().equals(that.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.
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