Hi Alexander,
It would actually be a great improvement for ops if we could add a switch
to compactionstats in order to have the compression ratio applied
automatically.
Yes actually that can be nice.
Thank you guys for you reply. I have 34GB in total size of our sstable
@Jonathan
Haddad. And the ratio is 0.17053810600081237
SSTable Compression Ratio: 0.17053810600081237
Then my actual size of data uncompressed is 0.17053810600081237 x 34GB ~~
200GB which makes sense :)
Nice to know the subtlenes of cassandra :)
Saludos
Jean Carlo
"The best way to predict the future is to invent it" Alan Kay
On Thu, Jan 5, 2017 at 8:53 AM, Alexander Dejanovski <[email protected]
> wrote:
> Indeed, nodetool compactionstats shows uncompressed sizes.
> As Oleksandr suggests, use the table compression ratio to compute the
> actual size on disk.
>
> It would actually be a great improvement for ops if we could add a switch
> to compactionstats in order to have the compression ratio applied
> automatically.
>
> On Thu, Jan 5, 2017 at 7:22 AM Oleksandr Shulgin <
> [email protected]> wrote:
>
>> On Jan 4, 2017 17:58, "Jean Carlo" <[email protected]> wrote:
>>
>> Hello guys
>>
>> I have a table with 34Gb of data in sstables (including tmp). And I can
>> see cassandra is doing some compactions on it. What surprissed me is that
>> nodetool compactionstats says he is compacting 138.66GB
>>
>>
>> root@node001 /root # nodetool compactionstats -H
>> pending tasks: 103
>> * compaction type keyspace table
>> completed total unit progress*
>> Compaction keyspace1 table_02 112.74 GB
>> 138.66 GB bytes 81.31%
>> Active compaction remaining time : 0h03m27s
>>
>> So My question is, from where those 138.66GB come if my table has only
>> 34GB of data.
>>
>>
>> Hello,
>>
>> I believe that output of compactionstats shows you the size of
>> *uncompressed* data. Can you check (with nodetool tablestats) your
>> compression ratio?
>>
>> --
>> Alex
>>
>> --
> -----------------
> Alexander Dejanovski
> France
> @alexanderdeja
>
> Consultant
> Apache Cassandra Consulting
> http://www.thelastpickle.com
>
