[jira] [Created] (SOLR-16242) Regenerate heavy joins in background

["Mikhail Khludnev (Jira)" <ji...@apache.org>]

Mikhail Khludnev created SOLR-16242:
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             Summary: Regenerate heavy joins in background
                 Key: SOLR-16242
                 URL: https://issues.apache.org/jira/browse/SOLR-16242
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: query
            Reporter: Mikhail Khludnev
            Assignee: Mikhail Khludnev


* When join queries specifies fromIndex result docset might be cached let's say in toIndex filter cache. Usually joins are heavy, take a while to execute. But after result docset is cached it respond fast. 
* if docs updated in fromIndex and commit occurs (in fromIndex) the next request (for the same join query) misses the toIndex filter cache and takes a while to regenerate this join query entry. 
* However, we might be ok to use old docset in toIndex if it doesn't harm query latency, and fine if changes in fromIndex will be joined little bit later. 
This issue proposes to introduce
#  \{!join cacheEventually=true ..}.. 
# separate user cache for these join query docsets and 
# update processor to regenerate them explicitly /solr/fromIndex/update?stream.body=%3Ccommit/%3E&post-processor=refresh-join-caches    



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