On Sat, Jun 22, 2013 at 10:42 AM, Wei Zhu <wz1...@yahoo.com> wrote: > I think the new SSTable will be in the new size. In order to do that, you > need to trigger a compaction so that the new SSTables will be generated. > for LCS, there is no major compaction though. You can run a nodetool repair > and hopefully you will bring some new SSTables and compactions will kick in. > Or you can change the $CFName.json file under your data directory and move > every SSTable to level 0. You need to stop your node, write a simple > script to alter that file and start the node again. > > I think it will be helpful to have a nodetool command to change the > SSTable Size and trigger the rebuild of the SSTables. >
I'd find that useful as well cheers > > Thanks. > -Wei > > ------------------------------ > *From: *"Robert Coli" <rc...@eventbrite.com> > *To: *user@cassandra.apache.org > *Sent: *Friday, June 21, 2013 4:51:29 PM > *Subject: *Re: Updated sstable size for LCS, ran upgradesstables, file > sizes didn't change > > > On Fri, Jun 21, 2013 at 4:40 PM, Andrew Bialecki > <andrew.biale...@gmail.com> wrote: > > However when we run alter the column > > family and then run "nodetool upgradesstables -a keyspace columnfamily," > the > > files in the data directory have been re-written, but the file sizes are > the > > same. > > > > Is this the expected behavior? If not, what's the right way to upgrade > them. > > If this is expected, how can we benchmark the read/write performance with > > varying sstable sizes. > > It is expected, upgradesstables/scrub/clean compactions work on a > single sstable at a time, they are not capable of combining or > splitting them. > > In theory you could probably : > > 1) start out with the largest size you want to test > 2) stop your node > 3) use sstable_split [1] to split sstables > 4) start node, test > 5) repeat 2-4 > > I am not sure if there is anything about level compaction which makes > this infeasible. > > =Rob > [1] https://github.com/pcmanus/cassandra/tree/sstable_split > > -- *Franc Carter* | Systems architect | Sirca Ltd <marc.zianideferra...@sirca.org.au> franc.car...@sirca.org.au | www.sirca.org.au Tel: +61 2 8355 2514 Level 4, 55 Harrington St, The Rocks NSW 2000 PO Box H58, Australia Square, Sydney NSW 1215
