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From "Semyon Semyonov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (NUTCH-2481) HostDatum deltas(previous step statistics) and Metadata expressions
Date Wed, 17 Jan 2018 13:44:00 GMT

     [ https://issues.apache.org/jira/browse/NUTCH-2481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Semyon Semyonov updated NUTCH-2481:
-----------------------------------
    Component/s:     (was: generator)

> HostDatum deltas(previous step statistics) and Metadata expressions
> -------------------------------------------------------------------
>
>                 Key: NUTCH-2481
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2481
>             Project: Nutch
>          Issue Type: Improvement
>          Components: hostdb
>            Reporter: Semyon Semyonov
>            Priority: Minor
>
> To allow the usage of previous step statistics(deltas of fetched,unfetced etc) in hostdb.
The motivation is usage of this statistics in generate with maxCount expressions.
>  
> The solution allows to fill in metadata of hostdatum based on custom JEXL expression
using two hostdatum: before update(previousHostDatum) and after update(currentHostDatum)..
> For example to fill in difference in quantity of fetched at round t and t-1 we can use
the following expression
> <property>
>  <name>hostdb.deltaExpression</name>
>  <value>\{return new ("javafx.util.Pair","FetchedDelta", currentHostDatum.fetched
- previousHostDatum.fetched);}</value>
> </property>
> A pull request will be provided shortly.



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