[jira] [Commented] (SOLR-2778) Revise distributed code inside SearchComponents

["Jason Rutherglen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-2778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108316#comment-13108316 ] 

Jason Rutherglen commented on SOLR-2778:
----------------------------------------

Sweet-ness.com!

> Revise distributed code inside SearchComponents
> -----------------------------------------------
>
>                 Key: SOLR-2778
>                 URL: https://issues.apache.org/jira/browse/SOLR-2778
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Martijn van Groningen
>
> The distributed code inside search components such as QueryComponent and FacetComponent is complex. By structuring responsibilities
> the code becomes less complex and easier to understand. There is already a start for this that was part of distributed grouping (SOLR-2066).
> The following concepts were developed inside QueryComponent for SOLR-2066:
> * ShardRequestFactory is responsible for creating requests to shards in the cluster based on the incoming request from the client.
> * ShardResultTransformer. Transforming a NamedList response from the client in for example SearchGroup or TopDocs instance.
> * ShardResponseProcessor. Basically merges the shard responses. The ShardReponseProcessor uses a ShardResultTransformer to transform the shard response into a native structure (SearchGroup / TopGroups).
> These concepts are now only used for distributed grouping, but I think can also be used for non grouped distributed search.

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