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Posted to user@cassandra.apache.org by Oleg Dulin <ol...@gmail.com> on 2013/05/07 20:35:56 UTC
Cassanrda 1.1.11 compression: how to tell if it works ?
I have a column family with really wide rows set to use Snappy like this:
compression_options = {'sstable_compression' :
'org.apache.cassandra.io.compress.SnappyCompressor'}
My understanding is that if a file is compressed I should not be able
to use "strings" command to view its contents. But it seems like I can
view the contents like this:
strings *-Data.db
At what point does compression start ? How can I confirm it is working ?
--
Regards,
Oleg Dulin
NYC Java Big Data Engineer
http://www.olegdulin.com/
Re: Cassanrda 1.1.11 compression: how to tell if it works ?
Posted by Robert Coli <rc...@eventbrite.com>.
On Thu, May 9, 2013 at 3:38 PM, aaron morton <aa...@thelastpickle.com> wrote:
>> At what point does compression start ?
> It starts for new SSTables created after the schema was altered.
@OP :
If you want to compress all existing SSTables, use "upgradesstables"
or "cleanup", both of which rewrite existing SSTables 1:1.
=Rob
Re: Cassanrda 1.1.11 compression: how to tell if it works ?
Posted by aaron morton <aa...@thelastpickle.com>.
> At what point does compression start ?
It starts for new SSTables created after the schema was altered.
> How can I confirm it is working ?
Compressed SSTables include a -CompressionInfo.db component on disk.
Cheers
-----------------
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 8/05/2013, at 6:35 AM, Oleg Dulin <ol...@gmail.com> wrote:
> I have a column family with really wide rows set to use Snappy like this:
>
> compression_options = {'sstable_compression' : 'org.apache.cassandra.io.compress.SnappyCompressor'}
>
> My understanding is that if a file is compressed I should not be able to use "strings" command to view its contents. But it seems like I can view the contents like this:
>
> strings *-Data.db
>
> At what point does compression start ? How can I confirm it is working ?
>
>
> --
> Regards,
> Oleg Dulin
> NYC Java Big Data Engineer
> http://www.olegdulin.com/