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From Michael McCandless <>
Subject Re: (Benchmark) Split DocMaker into DocCollector and DocMaker
Date Sat, 11 Apr 2009 15:21:40 GMT
Sounds great!

As long as LineDocMaker still has very low overhead :)

But how about the name RawContentSource (or maybe ContentSource)
instead of DocCollector?  Ie, it's the thing that pulls raw content
from somewhere, and then DocMaker creates documents from it?


On Sat, Apr 11, 2009 at 11:10 AM, Shai Erera <> wrote:
> Hi
> I would like to propose some refactoring to the benchmark package. Today,
> DocMaker has two roles: collecting documents from a collection and preparing
> a Document object. I think these two should actually be split up to
> DocCollector and DocMaker, which will use a DocCollector instance.
> DocCollector will implement all the methods of DocMaker, like
> getNextDocData, raw size in bytes tracking etc. This can actually fit well
> w/ 1591, by having a basic DocCollector that offers input stream services,
> and wraps a file (for example) with a bzip or gzip streams etc.
> DocMaker will implement the makeDocument methods, reusing DocState etc.
> The idea is that collecting the Enwiki documents, for example, should be the
> same whether I create documents using DocState, add payloads or index
> additional metadata. Same goes for Trec and Reuters collections, as well as
> LineDocMaker.
> In fact, if one inspects EnwikiDocMaker and LineDocMaker closely, they are
> 99% the same and 99% different. Most of their differences lie in the way
> they read the data, while most of the similarity lies in the way the create
> documents (using DocState).
> That led to a somehwat bizzare extension of LineDocMaker by EnwikiDocMaker
> (just the reuse of DocState). Also, other DocMakers do not use that DocState
> today.
> So by having a EnwikiDocCollector, ReutersDocCollector and others (TREC,
> Line, Simple), I can write several DocMakers, such as DocStateMaker,
> ConfigurableDocMaker (one which accpets all kinds of config options) and
> custom DocMakers (payload, facets, sorting), passing to them a DocCollector
> instance (much like we do today w/ DocMaker) and reuse the same DocMaking
> algorithm with many document collections, as well as the same document
> collection algorithm with many DocMaker implementations.
> This will also give us the opportunity to perf test document collection
> alone (i.e., compare bzip, gzip and regular input streams), w/o the overhead
> of creating a Document object.
> I've already done so in my code environment (I extend the benchmark package
> for my application's purposes) and I like the flexibility I have. I think
> this can be a nice contribution to the benchmark package, which can result
> in some code cleanup as well.
> What do you think? I can open an issue and work out a patch.
> Shai

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