thank u alot.But,anyway,I am still curious why the developer of the nutch not treat the UrlNormalizer as the others do.Is it a bug or a specified trick?
On Thu, Aug 25, 2011 at 5:09 PM, lewis john mcgibbney < [email protected]> wrote: > Hi Kaiwii, > > If you look at nutch-extensionpoints/plugin.xml you will see a short > comment > which states "...that plugins can define extension points as well to be > extendable". The the case of the ulrnormalizer series of plugins we can > specify settings (within nutch-site.xml) for which urlnormalizer plugins we > wish to use, in which order we wish to use them, etc. > > On Thu, Aug 25, 2011 at 4:31 AM, Kaiwii Ho <[email protected]> wrote: > > > I'm a freshman learning about the nutch. > > Here,I have serval questions: > > 1、URLNormalizer is a kind of a ExtensionPoint.But why does it implement > the > > Pluggable as other extensionpoint does? > > > > > And further-more,do any difference > > exist between the URLNormalizer and the other ExtensionPoint leading > > the URLNormalizer's not implementing the Pluggable? > > > > The honest truth here is I don't know, however I what difference would you > expect to get from comparing a pluggable urlnormalizer with accessing the > nutch-extensionpoint directly... is there any reason for this... IMHO it > would be easier to utilise the functionality of a particular plugin in the > usual way, through nutch-site.xml > > 2、while URLNormalizer not implementing the Pluggable,everything seems to > > work well.So,I wonder whether it is necessary to make the extensionpoint > > implement the Pluggable? > > > > As above... > > > > > Waiting for ur answer.And thank u! > > > > > -- > *Lewis* >
