Colin Patrick McCabe created HDFS-6984:
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Summary: In Hadoop 3, make FileStatus no longer a Writable
Key: HDFS-6984
URL: https://issues.apache.org/jira/browse/HDFS-6984
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 3.0.0
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
FileStatus was a Writable in Hadoop 2 and earlier. Originally, we used this to
serialize it and send it over the wire. But in Hadoop 2 and later, we have the
protobuf {{HdfsFileStatusProto}} which serves to serialize this information.
The protobuf form is preferable, since it allows us to add new fields in a
backwards-compatible way. Another issue is that already a lot of subclasses of
FileStatus don't override the Writable methods of the superclass, breaking the
interface contract that read(status.write) should be equal to the original
status.
In Hadoop 3, we should just make FileStatus no longer a writable so that we
don't have to deal with these issues. It's probably too late to do this in
Hadoop 2, since user code may be relying on the ability to use the Writable
methods on FileStatus objects there.
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