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From Yatong Zhang <bluefl...@gmail.com>
Subject Re: Is the updating compaction strategy from 'sized tiered' to 'leveled' automatic or need to be done manually?
Date Mon, 05 May 2014 06:54:08 GMT
What you mean 'you need write to this CF'? I've changed the schema by using
CQL3 'alter table' statments.


On Mon, May 5, 2014 at 2:28 PM, Viktor Jevdokimov <
Viktor.Jevdokimov@adform.com> wrote:

>  To trigger LCS you need to write to this CF and wait when new sstable
> flushes. I can’t find any other way to start LCS.
>
>
>    Best regards / Pagarbiai
> *Viktor Jevdokimov*
> Senior Developer
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> *From:* Yatong Zhang [mailto:blueflycn@gmail.com]
> *Sent:* Sunday, May 4, 2014 5:22 AM
> *To:* user@cassandra.apache.org
> *Subject:* Is the updating compaction strategy from 'sized tiered' to
> 'leveled' automatic or need to be done manually? [heur]
>
>
>
> Hi there,
>
> I am updating compaction strategy from 'sized tiered' to 'leveled' and
> from
> http://www.datastax.com/dev/blog/leveled-compaction-in-apache-cassandrait is said:
>
> When updating an existing column family, reads and writes can continue as
> usual while leveling of existing sstables is performed in the background.
>
>
>
> But I still see many old sstables with very large size and an old file
> date. So I am wondering is the updating of compaction done automatically?
> If yes, is there an estimate of time it will take? If not, what's the steps
> to do it manually?
>
> I've googled a lot but can't find something helpful. Thanks for any
> feedbacks and any help is of great appreciation.
>

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