-RE: Creating MapFile.Reader instance in reducer setup
Devaraj k 2012-06-19, 13:40
Can you share the exception stack trace and piece of code where you are trying to create?
From: Ondřej Klimpera [[EMAIL PROTECTED]]
Sent: Tuesday, June 19, 2012 6:03 PM
To: [EMAIL PROTECTED]
Subject: Creating MapFile.Reader instance in reducer setup
Hello, I'm tring to use MapFile (stored on HDFS) in my reduce task,
which processes some text data.
When I try to initialize MapFile.Reader in reducer configure() method,
app throws NullPointerException, when the same approach is used for each
reduce() method call with the same parameters, everything goes all right.
But creating instance of Reader for each reduce() call creates big slow
Do you have any idea what am I doing wrong.