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From "Ryan McKinley (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-2842) Re-factor UpdateChain and UpdateProcessor interfaces
Date Mon, 17 Oct 2011 21:37:10 GMT


Ryan McKinley commented on SOLR-2842:

I don't have a real proposal... just thinking about generally reusable pipeline code.

bq. Do you suggest to let UpdateProcessor base class implement this interface?

No, since most domain specific UpdateProcessors can be boiled down to this (tika, langid,
geonames, etc) i don't think they need to have access to the whole UpdateProcessor -- only
sometimes do they need access to SolrCore/Schema/ResourceLoader etc.  With minimal dependencies,
moving them around would be easy.

I was thinking we could have a general TransformingUpdateProcesor that could take a list of
transformers (or something), rather then having all the dependencies 

bq. But you still need to construct and initialize the processors even if they are wrapped
in the interface, thus my suggestion for a client side version of the factory.

I'm not convinced that a client side framework is necessary if the interfaces were easy enough
to deal with directly.  I can see where a DSL would be cool, but having a client side NamedListInitalizedPlugin
seems like a can of worms


> Re-factor UpdateChain and UpdateProcessor interfaces
> ----------------------------------------------------
>                 Key: SOLR-2842
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: update
>            Reporter: Jan H√łydahl
> The UpdateChain's main task is to send SolrInputDocuments through a chain of UpdateRequestProcessors
in order to transform them in some way and then (typically) indexing them.
> This generic "pipeline" concept would also be useful on the client side (SolrJ), so that
we could choose to do parts or all of the processing on the client. The most prominent use
case is extracting text (Tika) from large binary documents, residing on local storage on the
client(s). Streaming hundreds of Mb over to Solr for processing is not efficcient. See SOLR-1526.
> We're already implementing Tika as an UpdateProcessor in SOLR-1763, and what would be
more natural than reusing this - and any other processor - on the client side?
> However, for this to be possible, some interfaces need to change slightly..

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