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 <bluefl...@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.jevdoki...@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.jevdoki...@adform.com >> Phone: +370 5 212 3063, Fax +370 5 261 0453 >> J. Jasinskio 16C, LT-03163 Vilnius, Lithuania >> Follow us on Twitter: @adforminsider<http://twitter.com/#!/adforminsider> >> Experience Adform DNA <http://vimeo.com/76421547> >> [image: Adform News] <http://www.adform.com> >> [image: Adform awarded the Best Employer 2012] >> <http://www.adform.com/site/blog/adform/adform-takes-top-spot-in-best-employer-survey/> >> >> Disclaimer: The information contained in this message and attachments is >> intended solely for the attention and use of the named addressee and may be >> confidential. If you are not the intended recipient, you are reminded that >> the information remains the property of the sender. You must not use, >> disclose, distribute, copy, print or rely on this e-mail. If you have >> received this message in error, please contact the sender immediately and >> irrevocably delete this message and any copies. >> >> *From:* Yatong Zhang [mailto:bluefl...@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. >> > >
