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http://issues.apache.org/jira/browse/NUTCH-192?page=comments#action_12364788 ] 

Stefan Groschupf commented on NUTCH-192:
----------------------------------------

That's true. In any case I don't wan't to store the class id map. Since if we 
do that, you are right we can use strings. 
What you think about having a map in the MapWritable itself where we manually 
assign id's. This was may plan in very beginning but I was thinking that using 
WritableName would be better, but of cource I overseen problemes you mentioned.
Do you think haveing a static block in the MapwWritable like this, will solve 
our problems?
CACHE.put(LongWritable.class, new Byte(1));

Thanks for taking time to discuss this.

> meta data support for CrawlDatum
> --------------------------------
>
>          Key: NUTCH-192
>          URL: http://issues.apache.org/jira/browse/NUTCH-192
>      Project: Nutch
>         Type: Improvement
>     Versions: 0.8-dev
>     Reporter: Stefan Groschupf
>      Fix For: 0.8-dev
>  Attachments: metadata300106.patch, metadata310106.patch
>
> Supporting meta data in CrawlDatum would help to get a set of new nutch 
> features realized and makes a lot possible to smaller special focused search 
> engines.

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