improve semantics of the hadoop dfs command
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Key: HADOOP-1677
URL: https://issues.apache.org/jira/browse/HADOOP-1677
Project: Hadoop
Issue Type: Improvement
Components: dfs
Reporter: Nigel Daley
Priority: Minor
HADOOP-230 cover syntax changes. Capturing here some DFS command line semantic
comments between Doug and I:
The goal for DFS should be "UNIX-like *when* possible". The goals of HDFS are
primarily to be usable, scalable, reliable, high-performance, and, secondarily,
not to be gratuitously incompatible with UNIX. So, when it's easy to be
compatible, we certainly should. But when UNIX compatibility fights with one
of those other goals, it may lose.
Two examples of incompatibilities with UNIX (that will need to be evaluated
against the above goal), are:
UNIX: cp foo bar succeeds if bar exists
DFS: dfs -put foo bar fails if bar exists. (same for dfs -cp).
UNIX: mkdir foo fails if foo exists
DFS: dfs -mkdir succeeds silently if foo exists and is a directory (if foo is a
file than it fails).
Many more such incompatibilities exist.
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