Chris Nauroth created HADOOP-12172:
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Summary: FsShell mkdir -p makes an unnecessary check for the
existence of the parent.
Key: HADOOP-12172
URL: https://issues.apache.org/jira/browse/HADOOP-12172
Project: Hadoop Common
Issue Type: Improvement
Components: fs
Reporter: Chris Nauroth
Assignee: Chris Nauroth
Priority: Minor
The {{mkdir}} command in {{FsShell}} checks for the existence of the parent of
the directory and returns an error if it doesn't exist. The {{-p}} option
suppresses the error and allows the directory creation to continue, implicitly
creating all missing intermediate directories. However, the existence check
still runs even with {{-p}} specified, and its result is ignored. Depending on
the file system, this is a wasteful RPC call (HDFS) or HTTP request
(WebHDFS/S3/Azure) imposing extra latency for the client and extra load for the
server.
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