2011/3/23 Narendra Sharma <narendra.sha...@gmail.com>
> I think it is due to fragmentation in old gen, due to which survivor area > cannot be moved to old gen. 300MB data size of memtable looks high for 3G > heap. I learned that in memory overhead of memtable can be as high as 10x of > memtable data size in memory. So either increase the heap or reduce the > memtable thresholds further so that old gen gets freed up faster. With > 16CFs, I would do both i.e. increase the heap to say 4GB and reduce memtable > thresholds further. > > > I think that you don't undestend me, 300MB is a summary thresholds on all 16 CF, so one memtable_threshold is about 18MB. Or all the same it is necessary to reduce memtable_threshold?
