Yes. If you overwrite much older data with new data both "versions" of the column will remain on disk until compaction get's to work on both fragments of the row.
Cheers ----------------- Aaron Morton Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 6/08/2013, at 6:48 PM, Franc Carter <franc.car...@sirca.org.au> wrote: > > I've been thinking through some cases that I can see happening at some point > and thought I'd ask on the list to see if my understanding is correct. > > Say a bunch of columns have been loaded 'a long time ago', i.e long enough in > the past that they have been compacted. My understanding is that if some > these columns get reloaded then they are likely to sit in additional sstables > until the larger sstable is called up for compaction, which might be a while. > > The case that springs to mind is filling small gaps in data by doing bulk > loads around the gap to make sure that the gap is filled. > > Have I understood correctly ? > > thanks > > -- > Franc Carter | Systems architect | Sirca Ltd > 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 >
