Extend FileSystem API to return file-checksums/file-digests
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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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