[Cassandra Wiki] Update of "Partitioners" by GehrigKunz

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The "Partitioners" page has been changed by GehrigKunz:
https://wiki.apache.org/cassandra/Partitioners?action=diff&rev1=3&rev2=4

Comment:
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  Assumes keys are UTF8 strings.  Not recommended both because of this limitation and because globally ordering all your partitions generates hot spots: some partitions close together will get more activity than others, and the node hosting those will be overloaded relative to others.  You can try to mitigate with active load balancing but this works poorly in practice; by the time you can adjust token assignments so that less hot partitions are on the overloaded node, your workload often changes enough that the hot spot is now elsewhere.  Remember that preserving global order means you can't just pick and choose hot partitions to relocate, you have to relocate contiguous ranges.
  
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