Paul Baclace wrote:
Doug Cutting expressed a concern to me about using util.Random to generate
random 64 bit block numbers for NDFS. The following is my analysis.
Nice stuff, Paul. Thanks.
It just occurred to me that perhaps we could simply use sequential block
numbering. All block ids
Doug Cutting wrote:
It just occurred to me that perhaps we could simply use sequential block
numbering. All block ids are generated centrally on the namenode.
I'm not sure what the advantage of sequential block numbers would be
since long period PRNG block numbering does not even need to
Doug Cutting expressed a concern to me about using util.Random to generate
random 64 bit block numbers for NDFS. The following is my analysis.
Random number generators for NDFS block numbers
Requirements
capable of billions of block numbers
64 bit block numbers
deterministic
Thanks to archive.org, I found this additional reference:
http://www.math.sci.hiroshima-u.ac.jp/~m-mat/eindex.html
which is the English home page of Matsumoto san, co-originator of Mersenne
Twister.
There is a faq and the original C source.
Paul
Paul Baclace wrote:
[...]
Alternative
