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Hadoop, mail # user - How do I synchronize Hadoop jobs?

W.P. McNeill 2012-02-15, 19:23
Alejandro Abdelnur 2012-02-15, 19:28
John Armstrong 2012-02-15, 19:26
Bharath Mundlapudi 2012-02-15, 21:29
Bharath Mundlapudi 2012-02-15, 21:31
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Re: How do I synchronize Hadoop jobs?
bejoy.hadoop@... 2012-02-15, 19:28
Hi McNeil
             Have a look at OOZIE. It is meant for work flow management in hadoop and can serve your purpose.

------Original Message------
From: W.P. McNeill
To: Hadoop Mailing List
Subject: How do I synchronize Hadoop jobs?
Sent: Feb 16, 2012 00:53

Say I have two Hadoop jobs, A and B, that can be run in parallel. I have
another job, C, that takes the output of both A and B as input. I want to
run A and B at the same time, wait until both have finished, and then
launch C. What is the best way to do this?

I know the answer if I've got a single Java client program that launches A,
B, and C. But what if I don't have the option to launch all of them from a
single Java program? (Say I've got a much more complicated system with many
steps happening between A-B and C.) How do I synchronize between jobs, make
sure there's no race conditions etc. Is this what Zookeeper is for?

Bejoy K S

From handheld, Please excuse typos.