If cassandra does not have enough disk space to create a new file it will provoke a JVM GC which should result in compacted SStables that are no longer needed been deleted. Otherwise they are deleted at some time in the future.
Compacted SSTables have a file written out with a "compacted" extension. Do you see compacted sstables in the data directory? Cheers. ----------------- Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 26/08/2011, at 2:29 AM, yuki watanabe wrote: > > We are using Cassandra 0.8.0 with 8 node ring and only one CF. > Every column has TTL of 86400 (24 hours). we also set 'GC grace second' to > 43200 > (12 hours). We have to store massive amount of data for one day now and > eventually for five days if we get more disk space. > Even for one day, we do run out disk space in a busy day. > > We run nodetool compact command at night or as necessary then we run GC from > jconsole. We observed that GC did remove files but not necessarily oldest > ones. > Data files from more than 36 hours ago and quite often three days ago are > still there. > > Does this behavior expected or we need adjust some other parameters? > > > Yuki Watanabe
