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Do not compress the data for Imapala-Use cases

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Do not compress the data for Imapala-Use cases

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Hello Friends,

While I was reading through Choosing the File Format for a Table -impala (http://www.cloudera.com/content/cloudera/en/documentation/cdh5/latest/Impala/Installing-and-Using-Im... one thing got stopped me is " If your architecture involves storing data to be queried in memory, do not compress the data. There is no I/O savings since the data does not need to be moved from disk, but there is a CPU cost to decompress the data.". I could not understand that completly, if any body knew, can we ellaborate that with one small example?

 

Regards

Sreeman

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