[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 = (L ~0~ + L ~1~/D + L ~2~/D ^2^ + L ~3~/D ^3^ + ... + L ~H~/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 = (L ~0~*/D ^0^* + L ~1~/D *^1^* + L ~2~/D ^2^ + L ~3~/D ^3^ + ... + L ~H~/D ^H^) */ (1/D ^0^ + 1/D ^1^ + 1/D ^2^ + 1/D ^3^ + ... 1/D ^H^)*

... or more concisely as:

L = (∑^H^~i=0~ L ~i~/D ^i^) */* (∑^H^~i=0~ *1/*D ^i^)

... 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 = (L ~0~ + L ~1~/D + L ~2~/D ^2^ + L ~3~/D ^3^ + ... + L ~H~/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 = (L ~0~/D^0^ + L ~1~/D^1^ + L ~2~/D^2^ + L ~3~/D^3^ + ... + L ~H~/D ^H^) / (1/D ^0^ + 1/D ^1^ + 1/D ^2^ + 1/D ^3^ + ... 1/D ^H^)

... or more concisely as:

L = (∑^H^~i=0~ L ~i~/D ^i^) / (∑^H^~i=0~ 1/D ^i^)

... 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 = (L ~0~ + L ~1~/D + L ~2~/D ^2^ + L ~3~/D ^3^ + ... + L ~H~/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 = (L ~0~*/D ^0^* + L ~1~/D *^1^* + L ~2~/D ^2^ + L ~3~/D ^3^ + ... + L ~H~/D ^H^) */ (1/D ^0^ + 1/D ^1^ + 1/D ^2^ + 1/D ^3^ + ... 1/D ^H^)*
> ... or more concisely as:
> L = (∑^H^~i=0~ L ~i~/D ^i^) */* (∑^H^~i=0~ *1/*D ^i^)
> ... where D = decayFactor, and H = history.



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