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https://issues.apache.org/jira/browse/SOLR-13271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16779814#comment-16779814
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Christine Poerschke commented on SOLR-13271:
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{quote}... In some scenarios it's useful to be able to block any updates to a
collection, while still being able to search its contents. ...
{quote}
One edge case scenario could be even a collection that is deliberately empty
i.e. it has no content of its own but its replicas serve as 'federators' i.e.
callers pass the {{&collection=fooBar}} parameter in queries sent to the
'empty' collection and the empty collection replicas do load balancing,
federating and collating work.
{quote}... A more natural API would be to use a primary collection attribute:
...
{quote}
{quote}... Using property makes the API a little awkward, it should be a
primary attribute I think. ...
{quote}
I agree, a primary collection attribute seems clearer.
{quote}... We should be careful to document that setting the readOnly mode can
take a long time because the reload can cause IW.close which can trigger merges
etc.
{quote}
Great point! On initial thought it would be easy to think "read only" is quick
and the merge connection is not obviously apparent.
And I guess if segment merging cannot happen in read-only mode then "shard
splitting" (or indeed "shard merging") would also be out of the question in
read-only but replica additions or moves could be okay? That's out of scope
here though perhaps in the context of the .system collection migration.
> Implement a read-only mode for a collection
> -------------------------------------------
>
> Key: SOLR-13271
> URL: https://issues.apache.org/jira/browse/SOLR-13271
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.x, master (9.0)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: 8.x, master (9.0)
>
> Attachments: SOLR-13271.patch
>
>
> Spin-off from SOLR-11127. In some scenarios it's useful to be able to block
> any updates to a collection, while still being able to search its contents.
> Currently the scope of this issue is SolrCloud, ie. standalone Solr will not
> be supported.
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