[mod_cluster-issues] [JBoss JIRA] (MODCLUSTER-606) Documentation Error - Chapter 10 - Time decay formulas

[Leandro Quiroga (JIRA)]

     [ https://issues.jboss.org/browse/MODCLUSTER-606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leandro Quiroga updated MODCLUSTER-606:
---------------------------------------
    Description: 
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 + L~1~/D + L~2~/D^2^ + L~3~/D^3^ + ... + LH/D^H^) * (1 + D + D^2^ + D^3^ + ... D^H^)

... or more concisely as:

L = (∑^H^~i=0~ L~i~/D^i^) * (∑^H^~i=0~ D^i^)

... 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.

  was:
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.



> 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: 1.2.13.Final, 1.3.7.Final
>            Reporter: Leandro Quiroga
>            Assignee: Jean-Frederic Clere
>            Priority: Minor
>              Labels: documentation
>   Original Estimate: 1 hour
>  Remaining Estimate: 1 hour
>
> 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 + L~1~/D + L~2~/D^2^ + L~3~/D^3^ + ... + LH/D^H^) * (1 + D + D^2^ + D^3^ + ... D^H^)
> ... or more concisely as:
> L = (∑^H^~i=0~ L~i~/D^i^) * (∑^H^~i=0~ D^i^)
> ... 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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