Check if the tmp file used in the CLI exists before using it.
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Key: HADOOP-4089
URL: https://issues.apache.org/jira/browse/HADOOP-4089
Project: Hadoop Core
Issue Type: Bug
Reporter: Ashish Thusoo
Currently the CLI needs /tmp/<user-name> directory to be present, otherwise it
gives an error.
We should create it automatically when we launch the CLI.
This was reported by Chad.
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