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https://issues.apache.org/jira/browse/SOLR-8740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15183357#comment-15183357
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Adrien Grand commented on SOLR-8740:
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bq. And default to docValuesFormat="Memory" as well, or is that already the
default when docValues="true" is set?
Having the default setup not using the default codec looks dangerous to me as
it means that users won't be able to upgrade clusters without switching back to
the default codec first (which is the only supported one for backwards
compatibility).
bq. I've never been able to figure out why Lucene still needs Stored fields
(other than for tokenized text fields) if docValues is so much better.
Doc values are not better, they just have different trade-offs: stored fields
are optimized for randomly getting several values from a couple dozen documents
while doc values are optimized for sequentially reading a couple values from
many documents. If you were to replace stored fields with doc values,
performance would become horrible if your index is significantly larger than
your filesystem cache, especially if you have spinning disks. I suspect it
could be fine if it was only done for the version field as suggested above but
doing it for all fields sounds dangerous to me.
> use docValues by default
> ------------------------
>
> Key: SOLR-8740
> URL: https://issues.apache.org/jira/browse/SOLR-8740
> Project: Solr
> Issue Type: Improvement
> Affects Versions: master
> Reporter: Yonik Seeley
> Fix For: master
>
>
> We should consider switching to docValues for most of our non-text fields.
> This may be a better default since it is more NRT friendly and acts to avoid
> OOM errors due to large field cache or UnInvertedField entries.
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