cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Apache Wiki <wikidi...@apache.org>
Subject [Cassandra Wiki] Trivial Update of "VirtualNodes/Balance" by 0track
Date Mon, 07 Jan 2013 10:52:19 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The "VirtualNodes/Balance" page has been changed by 0track:
http://wiki.apache.org/cassandra/VirtualNodes/Balance?action=diff&rev1=7&rev2=8

  <<Anchor(imbalance)>>
  == Imbalance ==
  
- By default, a nodes tokens are randomly generated with the expectation that an even distribution
of the namespace will result.  However, variations of as much as 7% have been reported on
small clusters when using the `num_tokens` default of 256.
+ By default, nodes tokens are randomly generated with the expectation that an even distribution
of the namespace will result.  However, variations of as much as 7% have been reported on
small clusters when using the `num_tokens` default of 256.
  
  These randomly generated tokens are MD5 sums, so entropy isn't the problem here, at least
not in the sense that using a better RNG would create a more even distribution of ranges.
 Increasing the token count (either by increasing num_tokens, or the number of nodes) will
improve this, (the more tokens, the more the distribution will even out).
  

Mime
View raw message