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HBase >> mail # user >> Scan performance on compressed column families

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Re: Scan performance on compressed column families



On Sat, Nov 3, 2012 at 3:57 PM, David Koch <[EMAIL PROTECTED]> wrote:

> Hello,
> 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,
> /David