Serge Blazhiyevskyy 2012-11-13, 15:18
What hadoop version are we talking about?
From: Mark Kerzner <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
Reply-To: "[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>" <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
Date: Tuesday, November 13, 2012 5:16 PM
To: Hadoop User <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
I have a cluster with 4 nodes and 32 many cores on each. My default value for the maximum number of mappers per slot is 1:
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(which I think is wrong).
Howeve, when sizable jobs run, I see 65 mappers working, so it seems that it does create more than 1 mapper per node.
Questions: what maximum number of mappers would be appropriate in this situation? Is that the right way to set them?
Thank you. Sincerely,