Collisions don't matter in the partitioner. On Wed, Sep 26, 2018, 6:53 PM Anirudh Kubatoor <anirudh.kubat...@gmail.com> wrote:
> Isn't MD5 broken from a security standpoint? From wikipedia > *"One basic requirement of any cryptographic hash function is that it > should be computationally infeasible > < > https://en.wikipedia.org/wiki/Computational_complexity_theory#Intractability > > > to > find two non-identical messages which hash to the same value. MD5 fails > this requirement catastrophically; such collisions > <https://en.wikipedia.org/wiki/Collision_resistance> can be found in > seconds on an ordinary home computer"* > > Regards, > Anirudh > > On Wed, Sep 26, 2018 at 7:14 PM Jeff Jirsa <jji...@gmail.com> wrote: > > > In some installations, it's used for hashing the partition key to find > the > > host ( RandomPartitioner ) > > It's used for prepared statement IDs > > It's used for hashing the data for reads to know if the data matches on > all > > different replicas. > > > > We don't use CRC because conflicts would be really bad. There's probably > > something in the middle that's slightly faster than md5 without the > > drawbacks of crc32 > > > > > > On Wed, Sep 26, 2018 at 3:47 PM Tyagi, Preetika < > preetika.ty...@intel.com> > > wrote: > > > > > Hi all, > > > > > > I have a question about MD5 being used in the read path in Cassandra. > > > I wanted to understand what exactly it is being used for and why not > > > something like CRC is used which is less complex in comparison to MD5. > > > > > > Thanks, > > > Preetika > > > > > > > > >
