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Asked: 2026-06-16T15:20:06+00:00

Are there any major differences between Solr 3.6 and Solr 4.0 other than new

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Are there any major differences between Solr 3.6 and Solr 4.0 other than new features? Am I safe using my existing queries (those that work in Solr 3.6) inside of Solr 4.0?

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  1. Editorial Team

    Are there any major differences between Solr 3.6 and Solr 4.0 other
    than new features?

    I find this question weird, least to say. Bug fixes and new features are the whole point of releases!

    You can look at the full changelog of the Solr release which is a available here. Don’t forget that Solr and Lucene are released in unison so you also need to look for relevant changes in both projects.

    Am I safe using my existing queries (those that work in Solr 3.6)
    inside of Solr 4.0?

    Queries should be fine, but indices – probably not. Quoting javanna from another SO post:

    The index format has changed, but Solr will take care of upgrading the
    index. That happens automatically once you start Solr with your old
    index. But after that the index cannot be read anymore by a previous
    Solr/lucene version.

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