Caching of dynamic external file fields

["Zisis T." <zi...@runbox.com>]

In Solr there's /ExternalFileFieldReloader/ which is responsible for caching
the contents of external files whenever a new searcher is being warmed up. 

It happens that I've defined a dynamic field to be used as an
/ExternalField/ as in 
/*<dynamicField name="myfield*" .... /> */ 

If you have a look inside the code /ExternalFileFieldReloader/ there's a
loop over the explicit schema fields through /schema.getFields()/ which
means that dynamic external fields do not get cached. 

Of course I did notice that once those files started getting bigger (~50MB)
and searches started timing out. 

Q1 : Is there a specific reason why only explicit fields are cached?
Q2 : I have extended /ExternalFileFieldReloader/ and added the capability to
also cache dynamic external file field contents and it seems to be working
fine. Does anyone think this is useful to make it into Solr codebase?



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