On 19.2.2013, at 13.48, Charles Marcus CMarcus@Media-Brokers.com wrote:
On 2013-02-18 10:39 PM, Timo Sirainen tss@iki.fi wrote:
On 18.2.2013, at 23.50, Michael Grimm trashcan@odo.in-berlin.de wrote:
With "doveconf -H dovecot%9d" I do end in tons of reported collisions like ... | doveconf: Error: Duplicate host hashes: dovecot1368344 and dovecot2055005 | doveconf: Error: Duplicate host hashes: dovecot2042008 and dovecot2056918 | doveconf: Error: Duplicate host hashes: dovecot1844965 and dovecot2058312 Sure there are going to be hash collisions at some point, but I highly doubt you're going to create a million server Dovecot cluster. :)
I've been following this thread with interest (or mostly out of curiosity, as I will have no need for running multiple machines, except possibly to run one secondary machine as a 'hot spare', but here I'm confused (and my ignorance is apparently showing)...
How are any of the above 'collisions? The hashes are different.
Dovecot uses last 32 bits of SHA1 of the name. So collisions for example:
% printf "dovecot1368344"| sha1sum | awk '{print $1}' | cut -c 33- bd593aec % printf "dovecot2055005"| sha1sum | awk '{print $1}' | cut -c 33- bd593aec