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Posted to dev@nutch.apache.org by Julien Nioche <li...@gmail.com> on 2010/04/06 15:43:14 UTC
Nutch 2.0 roadmap
Hi guys,
I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
based on what is currently referred to as NutchBase. Shall we create a
branch for 2.0 in the Nutch SVN repository and have a label accordingly for
JIRA so that we can file issues / feature requests on 2.0? Do you think that
the current NutchBase could be used as a basis for the 2.0 branch?
Talking about features, what else would we add apart from :
* support for HBase : via ORM or not (see
NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
)
* plugin cleanup : Tika only for parsing - get rid of everything else?
* remove index / search and delegate to SOLR
* new functionalities e.g. sitemap support, canonical tag etc...
I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
update?
I look forward to hearing your thoughts on this
Julien
--
DigitalPebble Ltd
http://www.digitalpebble.com
Re: Nutch 2.0 roadmap
Posted by Andrzej Bialecki <ab...@getopt.org>.
On 2010-04-07 19:24, Enis Söztutar wrote:
>>> Also, the goal of the crawler-commons project is to provide APIs and
>>> implementations of stuff that is needed for every open source crawler
>>> project, like: robots handling, url filtering and url normalization, URL
>>> state management, perhaps deduplication. We should coordinate our
>>> efforts, and share code freely so that other projects (bixo, heritrix,
>>> droids) may contribute to this shared pool of functionality, much like
>>> Tika does for the common need of parsing complex formats.
>>>
>>>
>
> So, it seems that at some point, we need to bite the bullet, and
> refactor plugins, dropping backwards compatibility.
Right, that was my point - now is the time to break it, with the
cut-over to 2.0, and leaving 1.1 branch in a good shape, to serve well
enough in the interim period.
--
Best regards,
Andrzej Bialecki <><
___. ___ ___ ___ _ _ __________________________________
[__ || __|__/|__||\/| Information Retrieval, Semantic Web
___|||__|| \| || | Embedded Unix, System Integration
http://www.sigram.com Contact: info at sigram dot com
Re: Nutch 2.0 roadmap
Posted by Enis Söztutar <en...@gmail.com>.
Hi,
On 04/07/2010 07:54 PM, Doğacan Güney wrote:
> Hey everyone,
>
> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki<ab...@getopt.org> wrote:
>
>> On 2010-04-06 15:43, Julien Nioche wrote:
>>
>>> Hi guys,
>>>
>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
>>> based on what is currently referred to as NutchBase. Shall we create a
>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly for
>>> JIRA so that we can file issues / feature requests on 2.0? Do you think that
>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>>
>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>> fixes and changes in trunk since it's been last touched ...
>>
>>
> I know... But I still intend to finish it, I just need to schedule
> some time for it.
>
> My vote would be to go with nutchbase.
>
A suggestion would be to continue with trunk until nutch-base is stable.
Once it is, then we can merge the nutchbase branch to trunk (after 1.1
split), at which point trunk becomes the nutchbase+other issues merged.
Then when the time comes, we can fork branch-2.0 and release when
blockers are done. I strongly suggest against having a trunk and a 2.0
branch for development.
>
>>> Talking about features, what else would we add apart from :
>>>
>>> * support for HBase : via ORM or not (see
>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>> )
>>>
>> This IMHO is promising, this could open the doors to small-to-medium
>> installations that are currently too cumbersome to handle.
>>
>>
> Yeah, there is already a simple ORM within nutchbase that is
> avro-based and should
> be generic enough to also support MySQL, cassandra and berkeleydb. But
> any good ORM will
> be a very good addition.
>
Current ORM code is merged with nutchbase code, but I think the sooner
we split it the better, since development will be much more clear and
simple this way. A have opened Nutch-808 to explore the alternatives,
but we might as well continue with current implementation. I intent to
share my findings in a couple of days.
>
>>> * plugin cleanup : Tika only for parsing - get rid of everything else?
>>>
>> Basically, yes - keep only stuff like HtmlParseFilters (probably with a
>> different API) so that we can post-process the DOM created in Tika from
>> whatever original format.
>>
>> Also, the goal of the crawler-commons project is to provide APIs and
>> implementations of stuff that is needed for every open source crawler
>> project, like: robots handling, url filtering and url normalization, URL
>> state management, perhaps deduplication. We should coordinate our
>> efforts, and share code freely so that other projects (bixo, heritrix,
>> droids) may contribute to this shared pool of functionality, much like
>> Tika does for the common need of parsing complex formats.
>>
>>
So, it seems that at some point, we need to bite the bullet, and
refactor plugins, dropping backwards compatibility.
>>> * remove index / search and delegate to SOLR
>>>
>> +1 - we may still keep a thin abstract layer to allow other
>> indexing/search backends, but the current mess of indexing/query filters
>> and competing indexing frameworks (lucene, fields, solr) should go away.
>> We should go directly from DOM to a NutchDocument, and stop there.
>>
>>
> Agreed. I would like to add support for katta and other indexing
> backends at some point but
> NutchDocument should be our canonical representation. The rest should
> be up to indexing backends.
>
>
>> Regarding search - currently the search API is too low-level, with the
>> custom text and query analysis chains. This needlessly introduces the
>> (in)famous Nutch Query classes and Nutch query syntax limitations, We
>> should get rid of it and simply leave this part of the processing to the
>> search backend. Probably we will use the SolrCloud branch that supports
>> sharding and global IDF.
>>
>>
>>> * new functionalities e.g. sitemap support, canonical tag etc...
>>>
>> Plus a better handling of redirects, detecting duplicated sites,
>> detection of spam cliques, tools to manage the webgraph, etc.
>>
>>
>>> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
>>> update?
>>>
>> Definitely. :)
>>
>> --
>> Best regards,
>> Andrzej Bialecki<><
>> ___. ___ ___ ___ _ _ __________________________________
>> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
>> ___|||__|| \| || | Embedded Unix, System Integration
>> http://www.sigram.com Contact: info at sigram dot com
>>
>>
>>
>
>
>
Re: Nutch 2.0 roadmap
Posted by Doğacan Güney <do...@gmail.com>.
On Wed, Apr 7, 2010 at 20:32, Andrzej Bialecki <ab...@getopt.org> wrote:
> On 2010-04-07 18:54, Doğacan Güney wrote:
>> Hey everyone,
>>
>> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki <ab...@getopt.org> wrote:
>>> On 2010-04-06 15:43, Julien Nioche wrote:
>>>> Hi guys,
>>>>
>>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
>>>> based on what is currently referred to as NutchBase. Shall we create a
>>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly for
>>>> JIRA so that we can file issues / feature requests on 2.0? Do you think that
>>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>>
>>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>>> fixes and changes in trunk since it's been last touched ...
>>>
>>
>> I know... But I still intend to finish it, I just need to schedule
>> some time for it.
>>
>> My vote would be to go with nutchbase.
>
> Hmm .. this puzzles me, do you think we should port changes from 1.1 to
> nutchbase? I thought we should do it the other way around, i.e. merge
> nutchbase bits to trunk.
>
Hmm, I am a bit out of touch with the latest changes but I know that
the differences
between trunk and nutchbase are unfortunately rather large right now.
If merging nutchbase
back into trunk would be easier then sure, let's do that.
>
>>>> * support for HBase : via ORM or not (see
>>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>>> )
>>>
>>> This IMHO is promising, this could open the doors to small-to-medium
>>> installations that are currently too cumbersome to handle.
>>>
>>
>> Yeah, there is already a simple ORM within nutchbase that is
>> avro-based and should
>> be generic enough to also support MySQL, cassandra and berkeleydb. But
>> any good ORM will
>> be a very good addition.
>
> Again, the advantage of DataNucleus is that we don't have to handcraft
> all the mid- to low-level mappings, just the mid-level ones (JOQL or
> whatever) - the cost of maintenance is lower, and the number of backends
> that are supported out of the box is larger. Of course, this is just
> IMHO - we won't know for sure until we try to use both your custom ORM
> and DataNucleus...
I am obviously a bit biased here but I have no strong feelings really.
DataNucleus
is an excellent project. What I like about avro-based approach is the
essentially free
MapReduce support we get and the fact that supporting another language
is easy. So,
we can expose partial hbase data through a server and a python-client
can easily read/write to it, thanks
to avro. That being said, I am all for DataNucleus or something else.
>
> --
> Best regards,
> Andrzej Bialecki <><
> ___. ___ ___ ___ _ _ __________________________________
> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
> ___|||__|| \| || | Embedded Unix, System Integration
> http://www.sigram.com Contact: info at sigram dot com
>
>
--
Doğacan Güney
Re: Nutch 2.0 roadmap
Posted by Andrzej Bialecki <ab...@getopt.org>.
On 2010-04-07 18:54, Doğacan Güney wrote:
> Hey everyone,
>
> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki <ab...@getopt.org> wrote:
>> On 2010-04-06 15:43, Julien Nioche wrote:
>>> Hi guys,
>>>
>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
>>> based on what is currently referred to as NutchBase. Shall we create a
>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly for
>>> JIRA so that we can file issues / feature requests on 2.0? Do you think that
>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>
>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>> fixes and changes in trunk since it's been last touched ...
>>
>
> I know... But I still intend to finish it, I just need to schedule
> some time for it.
>
> My vote would be to go with nutchbase.
Hmm .. this puzzles me, do you think we should port changes from 1.1 to
nutchbase? I thought we should do it the other way around, i.e. merge
nutchbase bits to trunk.
>>> * support for HBase : via ORM or not (see
>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>> )
>>
>> This IMHO is promising, this could open the doors to small-to-medium
>> installations that are currently too cumbersome to handle.
>>
>
> Yeah, there is already a simple ORM within nutchbase that is
> avro-based and should
> be generic enough to also support MySQL, cassandra and berkeleydb. But
> any good ORM will
> be a very good addition.
Again, the advantage of DataNucleus is that we don't have to handcraft
all the mid- to low-level mappings, just the mid-level ones (JOQL or
whatever) - the cost of maintenance is lower, and the number of backends
that are supported out of the box is larger. Of course, this is just
IMHO - we won't know for sure until we try to use both your custom ORM
and DataNucleus...
--
Best regards,
Andrzej Bialecki <><
___. ___ ___ ___ _ _ __________________________________
[__ || __|__/|__||\/| Information Retrieval, Semantic Web
___|||__|| \| || | Embedded Unix, System Integration
http://www.sigram.com Contact: info at sigram dot com
Re: Nutch 2.0 roadmap
Posted by Doğacan Güney <do...@gmail.com>.
On Thu, Apr 8, 2010 at 21:11, MilleBii <mi...@gmail.com> wrote:
> Not sure what u mean by pig script, but I'd like to be able to make a
> multi-criteria selection of Url for fetching...
I mean a query language like
http://hadoop.apache.org/pig/
if we expose data correctly, then you should be able to generate on any criteria
that you want.
> The scoring method forces into a kind of mono dimensional approach
> which is not really easy to deal with.
>
> The regex filters are good but it assumes you want select URLs on data
> which is in the URL... Pretty limited in fact
>
> I basically would like to do 'content' based crawling. Say for
> example: that I'm interested in "topic A".
> I'd'like to label URLs that match "Topic A" (user supplied logic).
> Later on I would want to crawl "topic A" urls at a certain frequency
> and non labeled urls for exploring in a different way.
>
> This looks like hard to do right now
>
> 2010/4/8, Doğacan Güney <do...@gmail.com>:
>> Hi,
>>
>> On Wed, Apr 7, 2010 at 21:19, MilleBii <mi...@gmail.com> wrote:
>>> Just a question ?
>>> Will the new HBase implementation allow more sophisticated crawling
>>> strategies than the current score based.
>>>
>>> Give you a few example of what I'd like to do :
>>> Define different crawling frequency for different set of URLs, say
>>> weekly for some url, monthly or more for others.
>>>
>>> Select URLs to re-crawl based on attributes previously extracted.Just
>>> one example: recrawl urls that contained a certain keyword (or set of)
>>>
>>> Select URLs that have not yet been crawled, at the frontier of the
>>> crawl therefore
>>>
>>
>> At some point, it would be nice to change generator so that it is only a
>> handful
>> of methods and a pig (or something else) script. So, we would provide
>> most of the functions
>> you may need during generation (accessing various data) but actual
>> generation would be a pig
>> process. This way, anyone can easily change generate any way they want
>> (even make it more jobs
>> than 2 if they want more complex schemes).
>>
>>>
>>>
>>>
>>> 2010/4/7, Doğacan Güney <do...@gmail.com>:
>>>> Hey everyone,
>>>>
>>>> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki <ab...@getopt.org> wrote:
>>>>> On 2010-04-06 15:43, Julien Nioche wrote:
>>>>>> Hi guys,
>>>>>>
>>>>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will
>>>>>> be
>>>>>> based on what is currently referred to as NutchBase. Shall we create a
>>>>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly
>>>>>> for
>>>>>> JIRA so that we can file issues / feature requests on 2.0? Do you think
>>>>>> that
>>>>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>>>>
>>>>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>>>>> fixes and changes in trunk since it's been last touched ...
>>>>>
>>>>
>>>> I know... But I still intend to finish it, I just need to schedule
>>>> some time for it.
>>>>
>>>> My vote would be to go with nutchbase.
>>>>
>>>>>>
>>>>>> Talking about features, what else would we add apart from :
>>>>>>
>>>>>> * support for HBase : via ORM or not (see
>>>>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>>>>> )
>>>>>
>>>>> This IMHO is promising, this could open the doors to small-to-medium
>>>>> installations that are currently too cumbersome to handle.
>>>>>
>>>>
>>>> Yeah, there is already a simple ORM within nutchbase that is
>>>> avro-based and should
>>>> be generic enough to also support MySQL, cassandra and berkeleydb. But
>>>> any good ORM will
>>>> be a very good addition.
>>>>
>>>>>> * plugin cleanup : Tika only for parsing - get rid of everything else?
>>>>>
>>>>> Basically, yes - keep only stuff like HtmlParseFilters (probably with a
>>>>> different API) so that we can post-process the DOM created in Tika from
>>>>> whatever original format.
>>>>>
>>>>> Also, the goal of the crawler-commons project is to provide APIs and
>>>>> implementations of stuff that is needed for every open source crawler
>>>>> project, like: robots handling, url filtering and url normalization, URL
>>>>> state management, perhaps deduplication. We should coordinate our
>>>>> efforts, and share code freely so that other projects (bixo, heritrix,
>>>>> droids) may contribute to this shared pool of functionality, much like
>>>>> Tika does for the common need of parsing complex formats.
>>>>>
>>>>>> * remove index / search and delegate to SOLR
>>>>>
>>>>> +1 - we may still keep a thin abstract layer to allow other
>>>>> indexing/search backends, but the current mess of indexing/query filters
>>>>> and competing indexing frameworks (lucene, fields, solr) should go away.
>>>>> We should go directly from DOM to a NutchDocument, and stop there.
>>>>>
>>>>
>>>> Agreed. I would like to add support for katta and other indexing
>>>> backends at some point but
>>>> NutchDocument should be our canonical representation. The rest should
>>>> be up to indexing backends.
>>>>
>>>>> Regarding search - currently the search API is too low-level, with the
>>>>> custom text and query analysis chains. This needlessly introduces the
>>>>> (in)famous Nutch Query classes and Nutch query syntax limitations, We
>>>>> should get rid of it and simply leave this part of the processing to the
>>>>> search backend. Probably we will use the SolrCloud branch that supports
>>>>> sharding and global IDF.
>>>>>
>>>>>> * new functionalities e.g. sitemap support, canonical tag etc...
>>>>>
>>>>> Plus a better handling of redirects, detecting duplicated sites,
>>>>> detection of spam cliques, tools to manage the webgraph, etc.
>>>>>
>>>>>>
>>>>>> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
>>>>>> update?
>>>>>
>>>>> Definitely. :)
>>>>>
>>>>> --
>>>>> Best regards,
>>>>> Andrzej Bialecki <><
>>>>> ___. ___ ___ ___ _ _ __________________________________
>>>>> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
>>>>> ___|||__|| \| || | Embedded Unix, System Integration
>>>>> http://www.sigram.com Contact: info at sigram dot com
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Doğacan Güney
>>>>
>>>
>>>
>>> --
>>> -MilleBii-
>>>
>>
>>
>>
>> --
>> Doğacan Güney
>>
>
>
> --
> -MilleBii-
>
--
Doğacan Güney
Re: Nutch 2.0 roadmap
Posted by MilleBii <mi...@gmail.com>.
Not sure what u mean by pig script, but I'd like to be able to make a
multi-criteria selection of Url for fetching...
The scoring method forces into a kind of mono dimensional approach
which is not really easy to deal with.
The regex filters are good but it assumes you want select URLs on data
which is in the URL... Pretty limited in fact
I basically would like to do 'content' based crawling. Say for
example: that I'm interested in "topic A".
I'd'like to label URLs that match "Topic A" (user supplied logic).
Later on I would want to crawl "topic A" urls at a certain frequency
and non labeled urls for exploring in a different way.
This looks like hard to do right now
2010/4/8, Doğacan Güney <do...@gmail.com>:
> Hi,
>
> On Wed, Apr 7, 2010 at 21:19, MilleBii <mi...@gmail.com> wrote:
>> Just a question ?
>> Will the new HBase implementation allow more sophisticated crawling
>> strategies than the current score based.
>>
>> Give you a few example of what I'd like to do :
>> Define different crawling frequency for different set of URLs, say
>> weekly for some url, monthly or more for others.
>>
>> Select URLs to re-crawl based on attributes previously extracted.Just
>> one example: recrawl urls that contained a certain keyword (or set of)
>>
>> Select URLs that have not yet been crawled, at the frontier of the
>> crawl therefore
>>
>
> At some point, it would be nice to change generator so that it is only a
> handful
> of methods and a pig (or something else) script. So, we would provide
> most of the functions
> you may need during generation (accessing various data) but actual
> generation would be a pig
> process. This way, anyone can easily change generate any way they want
> (even make it more jobs
> than 2 if they want more complex schemes).
>
>>
>>
>>
>> 2010/4/7, Doğacan Güney <do...@gmail.com>:
>>> Hey everyone,
>>>
>>> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki <ab...@getopt.org> wrote:
>>>> On 2010-04-06 15:43, Julien Nioche wrote:
>>>>> Hi guys,
>>>>>
>>>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will
>>>>> be
>>>>> based on what is currently referred to as NutchBase. Shall we create a
>>>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly
>>>>> for
>>>>> JIRA so that we can file issues / feature requests on 2.0? Do you think
>>>>> that
>>>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>>>
>>>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>>>> fixes and changes in trunk since it's been last touched ...
>>>>
>>>
>>> I know... But I still intend to finish it, I just need to schedule
>>> some time for it.
>>>
>>> My vote would be to go with nutchbase.
>>>
>>>>>
>>>>> Talking about features, what else would we add apart from :
>>>>>
>>>>> * support for HBase : via ORM or not (see
>>>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>>>> )
>>>>
>>>> This IMHO is promising, this could open the doors to small-to-medium
>>>> installations that are currently too cumbersome to handle.
>>>>
>>>
>>> Yeah, there is already a simple ORM within nutchbase that is
>>> avro-based and should
>>> be generic enough to also support MySQL, cassandra and berkeleydb. But
>>> any good ORM will
>>> be a very good addition.
>>>
>>>>> * plugin cleanup : Tika only for parsing - get rid of everything else?
>>>>
>>>> Basically, yes - keep only stuff like HtmlParseFilters (probably with a
>>>> different API) so that we can post-process the DOM created in Tika from
>>>> whatever original format.
>>>>
>>>> Also, the goal of the crawler-commons project is to provide APIs and
>>>> implementations of stuff that is needed for every open source crawler
>>>> project, like: robots handling, url filtering and url normalization, URL
>>>> state management, perhaps deduplication. We should coordinate our
>>>> efforts, and share code freely so that other projects (bixo, heritrix,
>>>> droids) may contribute to this shared pool of functionality, much like
>>>> Tika does for the common need of parsing complex formats.
>>>>
>>>>> * remove index / search and delegate to SOLR
>>>>
>>>> +1 - we may still keep a thin abstract layer to allow other
>>>> indexing/search backends, but the current mess of indexing/query filters
>>>> and competing indexing frameworks (lucene, fields, solr) should go away.
>>>> We should go directly from DOM to a NutchDocument, and stop there.
>>>>
>>>
>>> Agreed. I would like to add support for katta and other indexing
>>> backends at some point but
>>> NutchDocument should be our canonical representation. The rest should
>>> be up to indexing backends.
>>>
>>>> Regarding search - currently the search API is too low-level, with the
>>>> custom text and query analysis chains. This needlessly introduces the
>>>> (in)famous Nutch Query classes and Nutch query syntax limitations, We
>>>> should get rid of it and simply leave this part of the processing to the
>>>> search backend. Probably we will use the SolrCloud branch that supports
>>>> sharding and global IDF.
>>>>
>>>>> * new functionalities e.g. sitemap support, canonical tag etc...
>>>>
>>>> Plus a better handling of redirects, detecting duplicated sites,
>>>> detection of spam cliques, tools to manage the webgraph, etc.
>>>>
>>>>>
>>>>> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
>>>>> update?
>>>>
>>>> Definitely. :)
>>>>
>>>> --
>>>> Best regards,
>>>> Andrzej Bialecki <><
>>>> ___. ___ ___ ___ _ _ __________________________________
>>>> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
>>>> ___|||__|| \| || | Embedded Unix, System Integration
>>>> http://www.sigram.com Contact: info at sigram dot com
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Doğacan Güney
>>>
>>
>>
>> --
>> -MilleBii-
>>
>
>
>
> --
> Doğacan Güney
>
--
-MilleBii-
Re: Nutch 2.0 roadmap
Posted by Doğacan Güney <do...@gmail.com>.
Hi,
On Wed, Apr 7, 2010 at 21:19, MilleBii <mi...@gmail.com> wrote:
> Just a question ?
> Will the new HBase implementation allow more sophisticated crawling
> strategies than the current score based.
>
> Give you a few example of what I'd like to do :
> Define different crawling frequency for different set of URLs, say
> weekly for some url, monthly or more for others.
>
> Select URLs to re-crawl based on attributes previously extracted.Just
> one example: recrawl urls that contained a certain keyword (or set of)
>
> Select URLs that have not yet been crawled, at the frontier of the
> crawl therefore
>
At some point, it would be nice to change generator so that it is only a handful
of methods and a pig (or something else) script. So, we would provide
most of the functions
you may need during generation (accessing various data) but actual
generation would be a pig
process. This way, anyone can easily change generate any way they want
(even make it more jobs
than 2 if they want more complex schemes).
>
>
>
> 2010/4/7, Doğacan Güney <do...@gmail.com>:
>> Hey everyone,
>>
>> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki <ab...@getopt.org> wrote:
>>> On 2010-04-06 15:43, Julien Nioche wrote:
>>>> Hi guys,
>>>>
>>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
>>>> based on what is currently referred to as NutchBase. Shall we create a
>>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly
>>>> for
>>>> JIRA so that we can file issues / feature requests on 2.0? Do you think
>>>> that
>>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>>
>>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>>> fixes and changes in trunk since it's been last touched ...
>>>
>>
>> I know... But I still intend to finish it, I just need to schedule
>> some time for it.
>>
>> My vote would be to go with nutchbase.
>>
>>>>
>>>> Talking about features, what else would we add apart from :
>>>>
>>>> * support for HBase : via ORM or not (see
>>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>>> )
>>>
>>> This IMHO is promising, this could open the doors to small-to-medium
>>> installations that are currently too cumbersome to handle.
>>>
>>
>> Yeah, there is already a simple ORM within nutchbase that is
>> avro-based and should
>> be generic enough to also support MySQL, cassandra and berkeleydb. But
>> any good ORM will
>> be a very good addition.
>>
>>>> * plugin cleanup : Tika only for parsing - get rid of everything else?
>>>
>>> Basically, yes - keep only stuff like HtmlParseFilters (probably with a
>>> different API) so that we can post-process the DOM created in Tika from
>>> whatever original format.
>>>
>>> Also, the goal of the crawler-commons project is to provide APIs and
>>> implementations of stuff that is needed for every open source crawler
>>> project, like: robots handling, url filtering and url normalization, URL
>>> state management, perhaps deduplication. We should coordinate our
>>> efforts, and share code freely so that other projects (bixo, heritrix,
>>> droids) may contribute to this shared pool of functionality, much like
>>> Tika does for the common need of parsing complex formats.
>>>
>>>> * remove index / search and delegate to SOLR
>>>
>>> +1 - we may still keep a thin abstract layer to allow other
>>> indexing/search backends, but the current mess of indexing/query filters
>>> and competing indexing frameworks (lucene, fields, solr) should go away.
>>> We should go directly from DOM to a NutchDocument, and stop there.
>>>
>>
>> Agreed. I would like to add support for katta and other indexing
>> backends at some point but
>> NutchDocument should be our canonical representation. The rest should
>> be up to indexing backends.
>>
>>> Regarding search - currently the search API is too low-level, with the
>>> custom text and query analysis chains. This needlessly introduces the
>>> (in)famous Nutch Query classes and Nutch query syntax limitations, We
>>> should get rid of it and simply leave this part of the processing to the
>>> search backend. Probably we will use the SolrCloud branch that supports
>>> sharding and global IDF.
>>>
>>>> * new functionalities e.g. sitemap support, canonical tag etc...
>>>
>>> Plus a better handling of redirects, detecting duplicated sites,
>>> detection of spam cliques, tools to manage the webgraph, etc.
>>>
>>>>
>>>> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
>>>> update?
>>>
>>> Definitely. :)
>>>
>>> --
>>> Best regards,
>>> Andrzej Bialecki <><
>>> ___. ___ ___ ___ _ _ __________________________________
>>> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
>>> ___|||__|| \| || | Embedded Unix, System Integration
>>> http://www.sigram.com Contact: info at sigram dot com
>>>
>>>
>>
>>
>>
>> --
>> Doğacan Güney
>>
>
>
> --
> -MilleBii-
>
--
Doğacan Güney
Re: Nutch 2.0 roadmap
Posted by MilleBii <mi...@gmail.com>.
Just a question ?
Will the new HBase implementation allow more sophisticated crawling
strategies than the current score based.
Give you a few example of what I'd like to do :
Define different crawling frequency for different set of URLs, say
weekly for some url, monthly or more for others.
Select URLs to re-crawl based on attributes previously extracted.Just
one example: recrawl urls that contained a certain keyword (or set of)
Select URLs that have not yet been crawled, at the frontier of the
crawl therefore
2010/4/7, Doğacan Güney <do...@gmail.com>:
> Hey everyone,
>
> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki <ab...@getopt.org> wrote:
>> On 2010-04-06 15:43, Julien Nioche wrote:
>>> Hi guys,
>>>
>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
>>> based on what is currently referred to as NutchBase. Shall we create a
>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly
>>> for
>>> JIRA so that we can file issues / feature requests on 2.0? Do you think
>>> that
>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>
>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>> fixes and changes in trunk since it's been last touched ...
>>
>
> I know... But I still intend to finish it, I just need to schedule
> some time for it.
>
> My vote would be to go with nutchbase.
>
>>>
>>> Talking about features, what else would we add apart from :
>>>
>>> * support for HBase : via ORM or not (see
>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>> )
>>
>> This IMHO is promising, this could open the doors to small-to-medium
>> installations that are currently too cumbersome to handle.
>>
>
> Yeah, there is already a simple ORM within nutchbase that is
> avro-based and should
> be generic enough to also support MySQL, cassandra and berkeleydb. But
> any good ORM will
> be a very good addition.
>
>>> * plugin cleanup : Tika only for parsing - get rid of everything else?
>>
>> Basically, yes - keep only stuff like HtmlParseFilters (probably with a
>> different API) so that we can post-process the DOM created in Tika from
>> whatever original format.
>>
>> Also, the goal of the crawler-commons project is to provide APIs and
>> implementations of stuff that is needed for every open source crawler
>> project, like: robots handling, url filtering and url normalization, URL
>> state management, perhaps deduplication. We should coordinate our
>> efforts, and share code freely so that other projects (bixo, heritrix,
>> droids) may contribute to this shared pool of functionality, much like
>> Tika does for the common need of parsing complex formats.
>>
>>> * remove index / search and delegate to SOLR
>>
>> +1 - we may still keep a thin abstract layer to allow other
>> indexing/search backends, but the current mess of indexing/query filters
>> and competing indexing frameworks (lucene, fields, solr) should go away.
>> We should go directly from DOM to a NutchDocument, and stop there.
>>
>
> Agreed. I would like to add support for katta and other indexing
> backends at some point but
> NutchDocument should be our canonical representation. The rest should
> be up to indexing backends.
>
>> Regarding search - currently the search API is too low-level, with the
>> custom text and query analysis chains. This needlessly introduces the
>> (in)famous Nutch Query classes and Nutch query syntax limitations, We
>> should get rid of it and simply leave this part of the processing to the
>> search backend. Probably we will use the SolrCloud branch that supports
>> sharding and global IDF.
>>
>>> * new functionalities e.g. sitemap support, canonical tag etc...
>>
>> Plus a better handling of redirects, detecting duplicated sites,
>> detection of spam cliques, tools to manage the webgraph, etc.
>>
>>>
>>> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
>>> update?
>>
>> Definitely. :)
>>
>> --
>> Best regards,
>> Andrzej Bialecki <><
>> ___. ___ ___ ___ _ _ __________________________________
>> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
>> ___|||__|| \| || | Embedded Unix, System Integration
>> http://www.sigram.com Contact: info at sigram dot com
>>
>>
>
>
>
> --
> Doğacan Güney
>
--
-MilleBii-
Re: Nutch 2.0 roadmap
Posted by Enis Söztutar <en...@gmail.com>.
Forgot to say that, at Hadoop, it is the convention that big issues,
like the ones under discussion come with a design document. So that a
solid design is agreed upon for the work. We can apply the same pattern
at Nutch.
On 04/07/2010 07:54 PM, Doğacan Güney wrote:
> Hey everyone,
>
> On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki<ab...@getopt.org> wrote:
>
>> On 2010-04-06 15:43, Julien Nioche wrote:
>>
>>> Hi guys,
>>>
>>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
>>> based on what is currently referred to as NutchBase. Shall we create a
>>> branch for 2.0 in the Nutch SVN repository and have a label accordingly for
>>> JIRA so that we can file issues / feature requests on 2.0? Do you think that
>>> the current NutchBase could be used as a basis for the 2.0 branch?
>>>
>> I'm not sure what is the status of the nutchbase - it's missed a lot of
>> fixes and changes in trunk since it's been last touched ...
>>
>>
> I know... But I still intend to finish it, I just need to schedule
> some time for it.
>
> My vote would be to go with nutchbase.
>
>
>>> Talking about features, what else would we add apart from :
>>>
>>> * support for HBase : via ORM or not (see
>>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>>> )
>>>
>> This IMHO is promising, this could open the doors to small-to-medium
>> installations that are currently too cumbersome to handle.
>>
>>
> Yeah, there is already a simple ORM within nutchbase that is
> avro-based and should
> be generic enough to also support MySQL, cassandra and berkeleydb. But
> any good ORM will
> be a very good addition.
>
>
>>> * plugin cleanup : Tika only for parsing - get rid of everything else?
>>>
>> Basically, yes - keep only stuff like HtmlParseFilters (probably with a
>> different API) so that we can post-process the DOM created in Tika from
>> whatever original format.
>>
>> Also, the goal of the crawler-commons project is to provide APIs and
>> implementations of stuff that is needed for every open source crawler
>> project, like: robots handling, url filtering and url normalization, URL
>> state management, perhaps deduplication. We should coordinate our
>> efforts, and share code freely so that other projects (bixo, heritrix,
>> droids) may contribute to this shared pool of functionality, much like
>> Tika does for the common need of parsing complex formats.
>>
>>
>>> * remove index / search and delegate to SOLR
>>>
>> +1 - we may still keep a thin abstract layer to allow other
>> indexing/search backends, but the current mess of indexing/query filters
>> and competing indexing frameworks (lucene, fields, solr) should go away.
>> We should go directly from DOM to a NutchDocument, and stop there.
>>
>>
> Agreed. I would like to add support for katta and other indexing
> backends at some point but
> NutchDocument should be our canonical representation. The rest should
> be up to indexing backends.
>
>
>> Regarding search - currently the search API is too low-level, with the
>> custom text and query analysis chains. This needlessly introduces the
>> (in)famous Nutch Query classes and Nutch query syntax limitations, We
>> should get rid of it and simply leave this part of the processing to the
>> search backend. Probably we will use the SolrCloud branch that supports
>> sharding and global IDF.
>>
>>
>>> * new functionalities e.g. sitemap support, canonical tag etc...
>>>
>> Plus a better handling of redirects, detecting duplicated sites,
>> detection of spam cliques, tools to manage the webgraph, etc.
>>
>>
>>> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
>>> update?
>>>
>> Definitely. :)
>>
>> --
>> Best regards,
>> Andrzej Bialecki<><
>> ___. ___ ___ ___ _ _ __________________________________
>> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
>> ___|||__|| \| || | Embedded Unix, System Integration
>> http://www.sigram.com Contact: info at sigram dot com
>>
>>
>>
>
>
>
Re: Nutch 2.0 roadmap
Posted by Doğacan Güney <do...@gmail.com>.
Hey everyone,
On Tue, Apr 6, 2010 at 20:23, Andrzej Bialecki <ab...@getopt.org> wrote:
> On 2010-04-06 15:43, Julien Nioche wrote:
>> Hi guys,
>>
>> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
>> based on what is currently referred to as NutchBase. Shall we create a
>> branch for 2.0 in the Nutch SVN repository and have a label accordingly for
>> JIRA so that we can file issues / feature requests on 2.0? Do you think that
>> the current NutchBase could be used as a basis for the 2.0 branch?
>
> I'm not sure what is the status of the nutchbase - it's missed a lot of
> fixes and changes in trunk since it's been last touched ...
>
I know... But I still intend to finish it, I just need to schedule
some time for it.
My vote would be to go with nutchbase.
>>
>> Talking about features, what else would we add apart from :
>>
>> * support for HBase : via ORM or not (see
>> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
>> )
>
> This IMHO is promising, this could open the doors to small-to-medium
> installations that are currently too cumbersome to handle.
>
Yeah, there is already a simple ORM within nutchbase that is
avro-based and should
be generic enough to also support MySQL, cassandra and berkeleydb. But
any good ORM will
be a very good addition.
>> * plugin cleanup : Tika only for parsing - get rid of everything else?
>
> Basically, yes - keep only stuff like HtmlParseFilters (probably with a
> different API) so that we can post-process the DOM created in Tika from
> whatever original format.
>
> Also, the goal of the crawler-commons project is to provide APIs and
> implementations of stuff that is needed for every open source crawler
> project, like: robots handling, url filtering and url normalization, URL
> state management, perhaps deduplication. We should coordinate our
> efforts, and share code freely so that other projects (bixo, heritrix,
> droids) may contribute to this shared pool of functionality, much like
> Tika does for the common need of parsing complex formats.
>
>> * remove index / search and delegate to SOLR
>
> +1 - we may still keep a thin abstract layer to allow other
> indexing/search backends, but the current mess of indexing/query filters
> and competing indexing frameworks (lucene, fields, solr) should go away.
> We should go directly from DOM to a NutchDocument, and stop there.
>
Agreed. I would like to add support for katta and other indexing
backends at some point but
NutchDocument should be our canonical representation. The rest should
be up to indexing backends.
> Regarding search - currently the search API is too low-level, with the
> custom text and query analysis chains. This needlessly introduces the
> (in)famous Nutch Query classes and Nutch query syntax limitations, We
> should get rid of it and simply leave this part of the processing to the
> search backend. Probably we will use the SolrCloud branch that supports
> sharding and global IDF.
>
>> * new functionalities e.g. sitemap support, canonical tag etc...
>
> Plus a better handling of redirects, detecting duplicated sites,
> detection of spam cliques, tools to manage the webgraph, etc.
>
>>
>> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
>> update?
>
> Definitely. :)
>
> --
> Best regards,
> Andrzej Bialecki <><
> ___. ___ ___ ___ _ _ __________________________________
> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
> ___|||__|| \| || | Embedded Unix, System Integration
> http://www.sigram.com Contact: info at sigram dot com
>
>
--
Doğacan Güney
Re: Nutch 2.0 roadmap
Posted by Julien Nioche <li...@gmail.com>.
Hi,
I'm not sure what is the status of the nutchbase - it's missed a lot of
> fixes and changes in trunk since it's been last touched ...
>
yes, maybe we should start the 2.0 branch from 1.1 instead
Dogacan - what do you think?
BTW I see there is now a 2.0 label under JIRA, thanks to whoever added it
> Also, the goal of the crawler-commons project is to provide APIs and
> implementations of stuff that is needed for every open source crawler
> project, like: robots handling, url filtering and url normalization, URL
> state management, perhaps deduplication. We should coordinate our
> efforts, and share code freely so that other projects (bixo, heritrix,
> droids) may contribute to this shared pool of functionality, much like
> Tika does for the common need of parsing complex formats.
>
definitely
+1 - we may still keep a thin abstract layer to allow other
> indexing/search backends, but the current mess of indexing/query filters
> and competing indexing frameworks (lucene, fields, solr) should go away.
> We should go directly from DOM to a NutchDocument, and stop there.
>
I think that separating the parsing filters from the indexing filters can
have its merits e.g. combining the metadata generated by 2 or more different
parsing filters into a single field in the NutchDocument, keeping only a
subset of the available information etc...
> >
> > I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
> > update?
>
Have created a new page to serve as a support for discussion :
http://wiki.apache.org/nutch/Nutch2Roadmap
julien
--
DigitalPebble Ltd
http://www.digitalpebble.com
Re: Nutch 2.0 roadmap
Posted by Andrzej Bialecki <ab...@getopt.org>.
On 2010-04-06 15:43, Julien Nioche wrote:
> Hi guys,
>
> I gather that we'll jump straight to 2.0 after 1.1 and that 2.0 will be
> based on what is currently referred to as NutchBase. Shall we create a
> branch for 2.0 in the Nutch SVN repository and have a label accordingly for
> JIRA so that we can file issues / feature requests on 2.0? Do you think that
> the current NutchBase could be used as a basis for the 2.0 branch?
I'm not sure what is the status of the nutchbase - it's missed a lot of
fixes and changes in trunk since it's been last touched ...
>
> Talking about features, what else would we add apart from :
>
> * support for HBase : via ORM or not (see
> NUTCH-808<https://issues.apache.org/jira/browse/NUTCH-808>
> )
This IMHO is promising, this could open the doors to small-to-medium
installations that are currently too cumbersome to handle.
> * plugin cleanup : Tika only for parsing - get rid of everything else?
Basically, yes - keep only stuff like HtmlParseFilters (probably with a
different API) so that we can post-process the DOM created in Tika from
whatever original format.
Also, the goal of the crawler-commons project is to provide APIs and
implementations of stuff that is needed for every open source crawler
project, like: robots handling, url filtering and url normalization, URL
state management, perhaps deduplication. We should coordinate our
efforts, and share code freely so that other projects (bixo, heritrix,
droids) may contribute to this shared pool of functionality, much like
Tika does for the common need of parsing complex formats.
> * remove index / search and delegate to SOLR
+1 - we may still keep a thin abstract layer to allow other
indexing/search backends, but the current mess of indexing/query filters
and competing indexing frameworks (lucene, fields, solr) should go away.
We should go directly from DOM to a NutchDocument, and stop there.
Regarding search - currently the search API is too low-level, with the
custom text and query analysis chains. This needlessly introduces the
(in)famous Nutch Query classes and Nutch query syntax limitations, We
should get rid of it and simply leave this part of the processing to the
search backend. Probably we will use the SolrCloud branch that supports
sharding and global IDF.
> * new functionalities e.g. sitemap support, canonical tag etc...
Plus a better handling of redirects, detecting duplicated sites,
detection of spam cliques, tools to manage the webgraph, etc.
>
> I suppose that http://wiki.apache.org/nutch/Nutch2Architecture needs an
> update?
Definitely. :)
--
Best regards,
Andrzej Bialecki <><
___. ___ ___ ___ _ _ __________________________________
[__ || __|__/|__||\/| Information Retrieval, Semantic Web
___|||__|| \| || | Embedded Unix, System Integration
http://www.sigram.com Contact: info at sigram dot com