Agree to Peter Schuller. On Sun, Jul 18, 2010 at 8:40 PM, Jonathan Ellis <jbel...@gmail.com> wrote:
> On Sun, Jul 18, 2010 at 2:45 AM, Schubert Zhang <zson...@gmail.com> wrote: > > In a heavy inserting (many client threads), the memtable flush (generate > new > > sstable) is frequent (e.g. one in 30s). > > This is a sign you should increase your memtable thresholds, btw. If > you wrote out larger sstables, there would be less duplicate i/o > reading them back in to compact them back out. > > Yes, I usually set very bigger memtable size, such as 512MB or 1GB, but I think is shoud just be a temp solution. > > Question: > > (1) Can we modify the compaction policy, to compact the smaller sstables > > with high priority? even when there is/are larger-compaction runing. > > (2) Can we implement multi-thread compaction? > > Isn't (1) a subset of (2)? > Maybe yes, depends the implementation. > > There is a ticket open for (2) at > http://issues.apache.org/jira/browse/CASSANDRA-1187 > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com >
