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https://issues.apache.org/jira/browse/SOLR-17725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18048490#comment-18048490
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David Smiley commented on SOLR-17725:
-------------------------------------
We avoid multiple PRs to be done for one JIRA where those PRs don't land on the
same branches/versions. Since #3903 isn't going to make it to 10.0 but #3883
did, I propose a separate linked JIRA specifically about UPGRADECOREINDEX be
created, that depends on the current issue for providing that merge policy.
> Automatically upgrade Solr indexes without needing to reindex from source
> -------------------------------------------------------------------------
>
> Key: SOLR-17725
> URL: https://issues.apache.org/jira/browse/SOLR-17725
> Project: Solr
> Issue Type: Improvement
> Reporter: Rahul Goswami
> Priority: Major
> Labels: pull-request-available
> Fix For: 10.0, 9.11
>
> Attachments: High Level Design.png
>
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> Today upgrading from Solr version X to X+2 requires complete reingestion of
> data from source. This comes from Lucene's constraint which only guarantees
> index compatibility between the version the index was created in and the
> immediate next version.
> This reindexing usually comes with added downtime and/or cost. Especially in
> case of deployments which are in customer environments and not completely in
> control of the vendor, this proposition of having to completely reindex the
> data can become a hard sell.
> I, on behalf of my employer, Commvault, have developed a way which achieves
> this reindexing in-place on the same index. Also, the process automatically
> keeps "upgrading" the indexes over multiple subsequent Solr upgrades without
> needing manual intervention.
> It comes with the following limitations:
> i) All _source_ fields need to be either stored=true or docValues=true. Any
> copyField destination fields can be stored=false of course, just that the
> source fields (or more precisely, the source fields you care about
> preserving) should be either stored or docValues true.
> ii) The datatype of an existing field in schema.xml shouldn't change upon
> Solr upgrade. Introducing new fields is fine.
> For indexes where this limitation is not a problem (it wasn't for us!), the
> tool can reindex in-place on the same core with zero downtime and
> legitimately "upgrade" the index. This can remove a lot of operational
> headaches, especially in environments with hundreds/thousands of very large
> indexes.
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