Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Hadoop streaming will run the process in “local” mode when there is no hadoop instance running on the box. I have a shell script that is controlling a set of hadoop streaming jobs in sequence and I need to condition copying files from HDFS to local depending on whether the jobs have been running locally or not. Is there a standard way to accomplish this test? I could do a “ps aux | grep something” but that seems ad-hoc.
Rather than trying to detect at run time which mode the process is operating, it is probably better to wrap the tool you are developing in a bash script that explicitly selects local vs cluster operatide. The O’Reilly Hadoop describes how to explicitly choose local using a configuration file override:
where
conf-local.xmlis an XML file configured for local operation.