Here's Sage's initial writeup: https://www.spinics.net/lists/ceph-devel/msg21635.html -Sam On Fri, Apr 3, 2020 at 12:12 PM Bobby <italienisch1987@xxxxxxxxx> wrote: > > Hi, > > I am trying to understand **Straw2** bucket used in **CRUSH algorithm** of **Ceph**. I have some specific questions. The code is given below: > > **Questions:** > > - Why there is a need of taking **log** of **hash value**? > - Is **x** the **placement ps** calculated by **crush_hash32_2** function? > - What function **crush_ln()** in the given code (mapper.c) is actually computing? I am confused by the comment **2^44*log2(input+1)**. > - Why there is a need of creating a negative number based on **ln (natural log)** of hash value? > > Please help me understand these points. > > Thanks in advance > _______________________________________________ > Dev mailing list -- dev@xxxxxxx > To unsubscribe send an email to dev-leave@xxxxxxx _______________________________________________ Dev mailing list -- dev@xxxxxxx To unsubscribe send an email to dev-leave@xxxxxxx
