[SIRONA-63] basic exponential decay counter implemenation

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.4-incubating
• Assignee: Romain Manni-Bucau
• Reporter: Romain Manni-Bucau
• Created: 27/Apr/16 16:07
• Updated: 27/Apr/16 16:30
• Resolved: 27/Apr/16 16:13

Description

1. active
   org.apache.sirona.counter.exponential-decay= true
2. alpha in http://dimacs.rutgers.edu/~graham/pubs/papers/fwddecay.pdf
   org.apache.sirona.counter.exponential-decay.alpha = 0.015
3. how many values to keep in mem
   org.apache.sirona.counter.exponential-decay.sampling-size= 512
4. each 5 s refresh stats (= recompute)
   org.apache.sirona.counter.exponential-decay.refresh-seconds= 5