[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-606) Documentation Error - Chapter 10 - Time decay formulas
Leandro Quiroga created MODCLUSTER-606:
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Summary: Documentation Error - Chapter 10 - Time decay formulas
Key: MODCLUSTER-606
URL: https://issues.jboss.org/browse/MODCLUSTER-606
Project: mod_cluster
Issue Type: Bug
Components: Documentation & Demos
Affects Versions: 1.3.7.Final, 1.2.13.Final
Reporter: Leandro Quiroga
Assignee: Jean-Frederic Clere
Priority: Minor
In chapter 10 (http://docs.jboss.org/mod_cluster/1.3.0/html_single/#java.load), it says:
The DynamicLoadBalanceFactorProvider applies a time decay function to the loads returned
by each metric. The aggregate load, with respect to previous load values, can be expressed
by the following formula:
L = (L0 + L1/D + L2/D2 + L3/D3 + ... + LH/DH) * (1 + D + D2 + D3 + ... DH)
... or more concisely as:
L = (∑Hi=0 Li/Di) * (∑Hi=0 Di)
... where D = decayFactor, and H = history.
But both formulas are wrong.
It should says:
The DynamicLoadBalanceFactorProvider applies a time decay function to the loads returned
by each metric. The aggregate load, with respect to previous load values, can be expressed
by the following formula:
L = (L0/D0 + L1/D1 + L2/D2 + L3/D3 + ... + LH/DH) / (1/D0 + 1/D1 + 1/D2 + 1/D3 + ...
1/DH)
... or more concisely as:
L = (∑Hi=0 Li/Di) / (∑Hi=0 1/Di)
... where D = decayFactor, and H = history.
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