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https://issues.apache.org/jira/browse/SOLR-564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12597635#action_12597635
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Hoss Man commented on SOLR-564:
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bq. Some issues that have been cropping up include the anywhere direct field
cache access is performed. This includes SimpleFacets, ValueSource, and other
places.
...like sorting.
bq. Performing work inside the segments and then merging the results later is
how the Ocean is designed. I'm not sure how much work it would take to have
Solr do the same.
this sounds akin to LUCENE-831 .. it should probably be dealt with at the
Lucene level before attempting any big hoop jumping in Solr
> Realtime search in Solr
> -----------------------
>
> Key: SOLR-564
> URL: https://issues.apache.org/jira/browse/SOLR-564
> Project: Solr
> Issue Type: New Feature
> Components: replication, search
> Affects Versions: 1.3
> Reporter: Jason Rutherglen
>
> Before when I looked at this, the changes required to make Solr realtime
> would seem to break the rest of Solr. Is this still the case? In project
> Ocean http://code.google.com/p/oceansearch/ there is a realtime core however
> integrating into Solr has looked like a redesign of the guts of Solr.
> - Support for replication per update to transaction log
> - Custom realtime index creation
> - Filter and facet merging
> - Custom IndexSearcher that ties into realtime subsystem
> - Custom SolrCore that ties into realtime subsystem
> Is there a way to plug into these low level Solr functions without a massive
> redesign? A key area of concern is the doclist caching which is not used in
> realtime search because after every update the doclists are no longer valid.
> The doclist caching and handling is default in SolrCore. Ocean relies on a
> custom threaded MultiSearcher rather than a single IndexSearcher is a
> difficulty. DirectUpdateHandler2 works directly on IndexWriter is
> problematic.
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