problem would be that for every file you flush, you would recompact all of L1 - files are flushed to L0, then compacted together with all overlapping files in L1.
On Tue, Sep 18, 2018 at 4:53 AM 健 戴 <daij...@me.com.invalid> wrote: > Hi, > > I have one table having 2T data saved in c* each node. > And if using LCS, the data will have 5 level: > > > - L1: 160M * 10 = 1.6G > - L2: 1.6G * 10 = 16G > - L3: 16G * 10 = 160G > - L4: 160G * 10 = 1.6T > - L5: 1.6T * 10 = 16T > > When I looking into the source code, I found an option: fanout_size. > > The default value is 10. What about change this value to 100? Then the > level will reduce to 3: > > - L1: 160M * 100 = 16G > - L2: 16G * 100 = 1.6T > - L3: 1.6T * 100 = 160T > > Or even could I set this to 10000? And all files are in a same level. > Should it be better then? > What is the cons of the bigger value of this option? > > Thanks for your help. > > > Jian >
