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From Leo Prince <leoprince.discussi...@gmail.com>
Subject Re: Solr7 org.apache.lucene.index.IndexUpgrader
Date Mon, 27 Nov 2017 07:16:12 GMT
Hi Shawn,

Thanks for the help.

I hate to burst your bubble here ... but 4 million docs is pretty small for
> a Solr index.  I have one index that's a hundred times larger, and there
> are people with *billions* of documents in SolrCloud.
>

Sorry I missed a "0" there. It's actually 40 Millions, still according to
you, it's still a small sized index. 😊😊


You would need to keep the schema the same for the upgrade, except that you
> would need to disable docValues on some of your fields to get rid of the
> error you encountered.  You won't be able to take advantage of some of the
> new capability in the new version unless you re-engineer your config/schema
> and reindex.
>

Thanks.. Got your point.



>
> Upgrading an index, especially through three major versions, is generally
> not recommended.  I always reindex when upgrading Solr, especially to a new
> major version, because Solr evolves quickly.
>

What method do you actually follow to re-index upon Solr major upgrade..?

I think I should do re-index since I am upgrading 3 major versions at once.
What is best method to re-index..? At present, I am planning to re-index by
SELECT from previous version (4.10.2) and then UPDATE into latest
version(7.1.0). Any other better thoughts to re-index..?

Thanks in advance,
Leo Prince.

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