[mythtv-users] hash

jam at tigger.ws jam at tigger.ws
Mon Mar 16 12:26:33 UTC 2020

On 16 Mar 2020, at 8:00 pm, mythtv-users-request at mythtv.org wrote:
>> we have a feature that I think is silly, over the years has on many occasions caused me great grief. Not to list identical hash files more than once. (scan fails to find a file)
>> The chance of two unrelated files having the same hash is a million to one. Terry Pratchtte wrote
>> 'the chance of a million-to-one event happening is 9-in-10'
>>  After yet another hour long session I decided to remove that 'feature;. Alas it is not so simple.
>> Someone put
>>         // I deleted the incorrect SQL select that was supposed to get
>>         // host name from ip address. Since it cannot work and has
>>         // been there 6 years I assume it is not important.
>> in the code right where the hash is gathered.
>> If they (or anybody else) can say a line or two I'd appreciate it lots. I want to totally disable the hash mechanism.
>> Please no kind words saying 'you really don't want to do that'
>> Thanks
>> James
>> _______________________________________________
> I believe the hash feature is useful in that if you rename a file and 
> rescan, it picks up the new name and retains the metadata information 
> from the old name.
> That comment you refer to looks like I put it there when I changed the 
> way the backend IP addresses are stored in the database. I don't know 
> what that has to do with the hash.
> I do not know anything about how the hash is calculated and used so I 
> can't help there.

Peter thanks.
The comments were right next to hash functions. As I am discovering and as you've explained the hash function is not trivial and a good deal of understanding is required.

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