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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? [heur]
Date Tue, 06 May 2014 12:01:34 GMT
Thanks for the reply Viktor, but the whole cluster has been working all the
time and I am sure the cf got writes every second. I still don't see the
huge sstables being split into small ones


On Tue, May 6, 2014 at 5:30 PM, Viktor Jevdokimov <
Viktor.Jevdokimov@adform.com> wrote:

>  Enough to write 1 column and run nodetool flush.
>
>
>
> *From:* Viktor Jevdokimov [mailto:Viktor.Jevdokimov@adform.com]
> *Sent:* Tuesday, May 6, 2014 12:00 PM
> *To:* user@cassandra.apache.org
> *Subject:* RE: Is the updating compaction strategy from 'sized tiered' to
> 'leveled' automatic or need to be done manually? [heur]
>
>
>
> I mean insert/write data. When data fills memtable, memtable is flushed to
> disk as sstable, when new sstable is created, Cassandra will check if
> compaction is needed and triggers one.
>
>
>
> *From:* Yatong Zhang [mailto:blueflycn@gmail.com <blueflycn@gmail.com>]
> *Sent:* Monday, May 5, 2014 9:54 AM
> *To:* user@cassandra.apache.org
> *Subject:* Re: Is the updating compaction strategy from 'sized tiered' to
> 'leveled' automatic or need to be done manually? [heur]
>
>
>
> 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
>
>
>
> Email: Viktor.Jevdokimov@adform.com
>
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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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