Hi Talat,
On Sun, Nov 3, 2013 at 5:13 PM, <dev-digest-h...@nutch.apache.org> wrote:
>
> Why is createWebStore not generic ?
> 24736 by: Talat UYARER
>
> Hi All,
>
> I need create a table in plugins
I don't understand this/I am not familiar with this. You mean you are
building a table based on the plugins you use? Can you please elaborate.
> But I dont create that because of this code:
>
> if (WebPage.class.equals(persistentClass)) {
> schema = conf.get("storage.schema.webpage", "webpage");
> } else if (Host.class.equals(persistentClass)) {
> schema = conf.get("storage.schema.host", "host");
> } else {
> throw new UnsupportedOperationException("Unable to create store for
> class " + persistentClass);
> }
>
The code you've posted reflects the fact that Nutch 2.x can currently build
a Web table and Host table. THIS IS ALL. Depending on which Nutch tools you
use e.g. inject, updatedb, readdb or hostinject, updatehostdb and
readhostdb and subsequently which persistent class WebPage [0] or Host [1]
will be used respectively determines which persistent class is passed as a
parameter to them method @runtime. This way, the correct table can be
created within the backend datastore.
>
> Other methods are generic in StorageUtils.java What is the reasons of
> support other store creation ?
>
> You would need to write the avro schema (data model) for *another*
persistent class and store if you wished to use anything other than WebDB
and HostDB. Currently there is nothing stopping you Talat.
Hope this makes sense.
Thanks
Lewis
[0]
https://svn.apache.org/repos/asf/nutch/branches/2.x/src/java/org/apache/nutch/storage/Host.java
[1]
https://svn.apache.org/repos/asf/nutch/branches/2.x/src/java/org/apache/nutch/storage/WebPage.java
[2]
[3]
