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Posted to commits@cassandra.apache.org by Apache Wiki <wi...@apache.org> on 2013/11/15 00:09:23 UTC

[Cassandra Wiki] Update of "NodeTool" by GehrigKunz

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The "NodeTool" page has been changed by GehrigKunz:
https://wiki.apache.org/cassandra/NodeTool?action=diff&rev1=23&rev2=24

Comment:
statcounter

  Typically in a histogram the values are plotted over discrete intervals. Similarly Cassandra defines buckets. The number of buckets is 1 more than the bucket offsets. The last element is values greater than the last offset. The values you see in the Offset column in the output is bucket offsets.
  The bucket offset starts at 1 and grows by 1.2 each time (rounding and removing duplicates). It goes from 1 to around 36M by default (creating 90+1 buckets), which will give us timing resolution from microseconds to 36 seconds, with less precision as the numbers get larger. (see EstimatedHistogram class)
  
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