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From Daniel Chia <danc...@coursera.org>
Subject Re: Is the updating compaction strategy from 'sized tiered' to 'leveled' automatic or need to be done manually?
Date Mon, 05 May 2014 07:24:47 GMT
If you want to trigger a conversion to LCS of the on-disk sstables, doing
"nodetool compact <cf>" should achieve what you want.

Be warned, if you have a lot of data in the CF, this could potentially take
a while depending on your compaction throttling.

Thanks,
Daniel


On Sun, May 4, 2014 at 11:54 PM, Yatong Zhang <blueflycn@gmail.com> wrote:

> 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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