On Fri, Aug 2, 2013 at 5:16 PM, Stefan Fuhrmann < stefan.fuhrm...@wandisco.com> wrote:
> On Fri, Aug 2, 2013 at 5:11 AM, Daniel Shahaf <danie...@elego.de> wrote: > >> stef...@apache.org wrote on Thu, Aug 01, 2013 at 17:36:42 -0000: >> > Author: stefan2 >> > Date: Thu Aug 1 17:36:42 2013 >> > New Revision: 1509342 >> > >> > URL: http://svn.apache.org/r1509342 >> > Log: >> > On the log-addressing branch: >> >> High-level question: how does this compare to fsx? Is this a feature >> fsx already has that is now being backported to fsfs? >> > (forgot to answer that part) FSX and FSFS f7 do indeed share that feature and will provide the following common features based on it but with different implementations: * pack reorders data * block read & prefetch * checksum all data FSX however replaces the "isolated" FS on-disk items with containers for massively reduced on-disk and in-memory size. Also, the txdelta algorithm will differ (fixed window v1 in FSFS vs. sliding window v2 in FSX). Basically, f7 looks just like f6 but offsets need to get though an index translation to get the physical offset. Everything else is mere optimization that's enabled by this indirection. See also: http://svn.haxx.se/dev/archive-2013-07/0059.shtml -- Stefan^2.
