On 7/18/2011 4:14 AM, Héctor Izquierdo Seliva wrote:
Hector, some before/after numbers would be great if you can find them.
Thanks!
I'll try and get some for you :)
What happens when your cache gets trashed? Do compactions and flushes
go slower?
If you use flashcache-wt flushed and compacted sstables will go to the
cache.
All reads are cached, so if you compact three sstables into one, you are
stuffing your cache with a lot of useless crap and evicting valid blocks
(flashcache won't honor any of the hints set with fadvise, as it's a
block cache layer and doesn't know of them anyway). If your write rate
is low it might work for you.
Interesting. So, there is no segregation between read and write cache
space? A compaction or flush can evict blocks in the read cache if it
needs the space for write buffering?
aj
