hindikaynen opened a new pull request #224: 
https://issues.apache.org/jira/browse/LUCENENET-607
URL: https://github.com/apache/lucenenet/pull/224
 
 
   StringHelper.GOOD_FAST_HASH_SEED property is not thread-safe and could 
return different values if called in severeal threads in one moment, so it 
could result in duplicate values in BytesRefHash (same values return different 
hashes because hashes were calcucated with different seeds).
   
   There is another issue with GOOD_FAST_HASH_SEED. DateTime.Now.Millisecond is 
used to randomize the seed, but DateTime.Now.Millisecond could return 0 and 
this value is treated an "uninitialized" and the second GOOD_FAST_HASH_SEED 
call will return another value.

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