Estimating the time of hadoop job?

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Currently I'm developing an application which would ingest logs of order of 70-80 GB of data/day and would then do Some analysis on them

Now the infrastructure that I have is a 4 node cluster( all nodes on Virtual Machines) , all nodes have 4GB ram.

But when I try to run the dataset (which is a sample dataset at this point ) of about 30 GB, it takes about 3 hrs to process all of it.

I would like to know is it normal for this kind of infrastructure to take this amount of time.

posted Dec 17, 2013 by Sonu Jindal

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2 Answers

It depends on:how many cores on each VNodehow complicated of your analysis application. But I don't think its normal spent 3hr to process 30GB data even on your *not good* hardware.

answer Dec 17, 2013 by Ahmed Patel

One of the problems you run into with Hadoop in Virtual Machine environments is performance issues when they are all running on the same physical host. With a VM, even though you are giving them 4 GB of RAM, and a virtual CPU and disk, if the virtual machines are sharing physical components like processor and physical storage medium, they compete for resources at the physical level. Even if you have the VM on a single host, or on a multi-core host with multiple disks and they are sharing as few resources as possible, there will still be a performance hit when the VM information has to pass through the hypervisor layer - co-scheduling resources with the host and things like that.

answer Dec 17, 2013 by anonymous

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