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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Questions about compression
Date Thu, 26 Jan 2012 19:02:10 GMT
On Thu, Jan 26, 2012 at 10:54 AM, Yves Langisch <yves@langisch.ch> wrote:
> Hi,
> I've a few questions concerning compression:
> 1) What are the steps to change the compression algorithm (e.g. LZO -> Snappy) for
an existing table?

Change the schema, make sure you have the libs.

> 2) How can I copy one table to another (same structure, different compression) in order
to make some tests beforehand? Is there any simple shell command for this task?

Look for the job named CopyTable.

> 3) Just to get some insight: Are the rows in the memstores already compressed or does
it happen during a flash only?

At flush.


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