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From David Koch <ogd...@googlemail.com>
Subject Scan performance on compressed column families
Date Sat, 03 Nov 2012 14:57:37 GMT

Are scans faster when compression is activated? The HBase book by Lars
George seems to suggest so (p424, Section on "Compression" in chapter
"Performance Tuning").

"... compression usually will yield overall better performance, because the
overhead of the CPU performing the compression and de- compression is less
than what is required to read more data from disk."

I searched around for a bit and found this:
http://gbif.blogspot.fr/2012/02/performance-evaluation-of-hbase.html. The
author conducted a series of scan performance tests on tables of up to
200million rows and found that compression actually slowed down read
performance slightly - albeit at lower CPU load.

Thank you,


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