On 1/16/07, Andrzej Bialecki <[EMAIL PROTECTED]> wrote:
Scott Green wrote:
> Hi Sami
>
> On 1/16/07, Sami Siren <[EMAIL PROTECTED]> wrote:
>> Scott Green wrote:
>> > Thanks Dennis! Your methond should work.
>> >
>> > And I really hope there is one directly method say getPluginRootDir()
>> > in the plugin implementation.
>>
>> I'd recommend taking path shown by Andrzej because IMO it's bad design
>> to depend on plugin system from a plugin.
>
> I am not much clear about your reason.
>
> The getPluginRootDir() method mentioned above should expose the
> (absolutely) path of xxx-plugin in the below example.
>
> plugins
> `-xxx-plugin
> `------ lib
> `------ conf
> `------ src
> `------ web (only for web plugin)
> `------ plugin.xml
> `------ build.xml
Ok. Now imagine that all plugins are packed together in a Jar file (as
is the case with Nutch). Is your method still going to work? Nope.
getPluginRootDir() may still return some non-null value (not sure about
that), but the resources are not available as files because they are
packed into a Jar.
Well, why should all resources needed to be packed?
The built result may looks like:
xxx-plugin
`--- conf
`--- web
`--- xxx-plugin.jar
`--- deps.jar
`-- plugin.xml
Now, you may have tested your method and found that it does indeed work
- but the reason is a bit obscure: the bin/nutch and bin/hadoop scripts
add your build/ directory to the classpath, so that you can locally test
the latest versions of the code without creating the *.job file.
However, when you run your code on a Hadoop cluster your local build/
directory is no longer accessible, and your method will mysteriously
fail - or even worse, you may get a different version of a resource from
an older version of the build/ directory found on Hadoop tasktracker
nodes ...
If you packed everything into jar(s), it is possible that the jar on
hadoop tasktracker node is old version, right?
>
> Andrzej's idea is limited(?) since i cannot get resources from conf dir.
Absolutely not - that's how the whole Configuration system works.
--
Best regards,
Andrzej Bialecki <><
___. ___ ___ ___ _ _ __________________________________
[__ || __|__/|__||\/| Information Retrieval, Semantic Web
___|||__|| \| || | Embedded Unix, System Integration
http://www.sigram.com Contact: info at sigram dot com
