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Posted to dev@lucene.apache.org by "Tom Winch (JIRA)" <ji...@apache.org> on 2015/12/10 18:01:11 UTC
[jira] [Issue Comment Deleted] (SOLR-8235) Federated Search (new) -
Merge
[ https://issues.apache.org/jira/browse/SOLR-8235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tom Winch updated SOLR-8235:
----------------------------
Comment: was deleted
(was: patch against SOLR 4.10.3)
> Federated Search (new) - Merge
> ------------------------------
>
> Key: SOLR-8235
> URL: https://issues.apache.org/jira/browse/SOLR-8235
> Project: Solr
> Issue Type: New Feature
> Reporter: Tom Winch
> Priority: Minor
> Labels: federated_search
> Fix For: 4.10.3
>
> Attachments: SOLR-8235.patch
>
>
> This issue describes a SearchComponent for merging search results obtained from a DJoin distributed search (see SOLR-8234) as part of federated search - that is, distributed search over documents stored in separated instances of SOLR (for example, one server per continent), where a single document (identified by an agreed, common unique id) may be stored in more than one server instance, with (possibly) differing fields and data.
> In the use of this search component, it is assumed that there is a single SOLR server (the "aggregator") that uses distributed search (shards=) to collect documents from other SOLR servers using DJoin (see SOLR-8234). The DJoin generates a result set containing parent documents each with child documents having the same unique id. This merge component turns each set of child documents into a single document conforming to the aggregator schema.
> For example, suppose the aggregator schema defines a multi-valued integer field, 'num', and three shards return field values "48", 23, and "strawberry". Then the resulting merged field value would be [48, 23] and an error would included for the NumberFormatException.
> Custom field merge behaviour may be specified by defining custom field types in the usual way and this is supported via a MergeAbstractFieldType class.
> This issue combines with others to provide full federated search support. See also SOLR-8234 and SOLR-8236.
> –
> Note that this is part of a new implementation of federated search as opposed to the older issues SOLR-3799 through SOLR-3805.
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