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:bluefl...@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.jevdoki...@adform.com<mailto: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<mailto:viktor.jevdoki...@adform.com> Phone: +370 5 212 3063<tel:%2B370%205%20212%203063>, Fax +370 5 261 0453<tel:%2B370%205%20261%200453> J. Jasinskio 16C, LT-03163 Vilnius, Lithuania Follow us on Twitter: @adforminsider<http://twitter.com/#!/adforminsider> Experience Adform DNA<http://vimeo.com/76421547> [Adform News]<http://www.adform.com> [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<mailto:bluefl...@gmail.com>] Sent: Sunday, May 4, 2014 5:22 AM To: user@cassandra.apache.org<mailto: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-cassandra it 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.
