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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-5244) Exporting Full Sorted Result Sets
Date Thu, 24 Jul 2014 17:50:40 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073429#comment-14073429
] 

David Smiley commented on SOLR-5244:
------------------------------------

I like rows=-1 for the same reason (vs. "all").  I'm not 100% sure I like the 'wt' being automatically
changed from what the user might specify but I can think of no better alternative.  It's too
bad the response format can't simply be the same.  I haven't dug into this issue to understand
the rationale.  I *do* appreciate that a binary output (e.g. Avro) is useful as an explicit
option if asked for.

> Exporting Full Sorted Result Sets
> ---------------------------------
>
>                 Key: SOLR-5244
>                 URL: https://issues.apache.org/jira/browse/SOLR-5244
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 5.0
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>            Priority: Minor
>             Fix For: 5.0, 4.10
>
>         Attachments: 0001-SOLR_5244.patch, SOLR-5244.patch, SOLR-5244.patch
>
>
> It would be great if Solr could efficiently export entire search result sets without
scoring or ranking documents. This would allow external systems to perform rapid bulk imports
from Solr. It also provides a possible platform for exporting results to support distributed
join scenarios within Solr.
> This ticket provides a patch that has two pluggable components:
> 1) ExportQParserPlugin: which is a post filter that gathers a BitSet with document results
and does not delegate to ranking collectors. Instead it puts the BitSet on the request context.
> 2) BinaryExportWriter: Is a output writer that iterates the BitSet and prints the entire
result as a binary stream. A header is provided at the beginning of the stream so external
clients can self configure.
> Note:
> These two components will be sufficient for a non-distributed environment. 
> For distributed export a new Request handler will need to be developed.
> After applying the patch and building the dist or example, you can register the components
through the following changes to solrconfig.xml
> Register export contrib libraries:
> <lib dir="../../../dist/" regex="solr-export-\d.*\.jar" />
>  
> Register the "export" queryParser with the following line:
>  
> <queryParser name="export" class="org.apache.solr.export.ExportQParserPlugin"/>
>  
> Register the "xbin" writer:
>  
> <queryResponseWriter name="xbin" class="org.apache.solr.export.BinaryExportWriter"/>
>  
> The following query will perform the export:
> {code}
> http://localhost:8983/solr/collection1/select?q=*:*&fq={!export}&wt=xbin&fl=join_i
> {code}
> Initial patch supports export of four data-types:
> 1) Single value trie int, long and float
> 2) Binary doc values.
> The numerics are currently exported from the FieldCache and the Binary doc values can
be in memory or on disk.
> Since this is designed to export very large result sets efficiently, stored fields are
not used for the export.



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