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https://issues.apache.org/jira/browse/SOLR-11677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714415#comment-16714415
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Uwe Schindler commented on SOLR-11677:
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Hi Hoss,
I think your idea is a good one. I'd like to try to provide a patch, depending
on the knowledge about that code part. I was asked several times already about
that issue (people using docvalues in-place updates for some per-document
metrics like click counts, but having many non-stored fields on the other side,
so they rely on in-place-updates).
> Add ability to "enforce" in-place updates
> -----------------------------------------
>
> Key: SOLR-11677
> URL: https://issues.apache.org/jira/browse/SOLR-11677
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: update
> Affects Versions: 6.6
> Reporter: Uwe Schindler
> Priority: Major
>
> There is currently a problem with in-place updates: Under certain conditions,
> an in-place update does not work, so Solr internally reindexes the whole
> document. This is not bad in most cases, unless you have some fields in your
> documents that are not stored (e.g. large fulltext fields). In that case, the
> try to do in-place update leads to data loss!
> I'd suggest to add a request parameter in the update to "enforce in-place
> mode". If not all conditions are met (e.g. field configuration is
> incompatible, version field does not have all required settings, or user uses
> other operations than "add" or "increment"), the request should simply fail -
> to prevent data loss!
> There is also a related issue that may lead to data loss because of the same
> issue: SOLR-11286. In this case it is completely unexpected because
> everything is correct from the schema settings, but it still does reindex.
> So there should really be a way to enforce in-place docvalues updates and
> fail otherwise!
> Another thing to maybe think of: Only prevent "reindexing" updates if
> documents have some fields that are unstored!
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