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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