Gregory Chanan created SOLR-8098:
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Summary: Immutable ConfigSets can still change in ZK
Key: SOLR-8098
URL: https://issues.apache.org/jira/browse/SOLR-8098
Project: Solr
Issue Type: Bug
Components: SolrCloud
Affects Versions: 5.3, Trunk
Reporter: Gregory Chanan
I don't think this is necessarily a bug, just writing it down here and tracking
it so we have a reference.
Came up with an interesting case when I was testing Immutable ConfigSets. I
had defined a managed schema example as Immutable and was checking that all the
files defined as part of the ConfigSet were present in ZooKeeper.
Occasionally, schema.xml was missing, which was surprising to me because I
wasn't able to modify the schema (because it was Immutable). Turns out that
the managed schema renames the schema.xml when a collection is created using
the schema, it doesn't need to be modified.
In theory we could build in some smarts to the ManagedIndexSchema to know it's
immutable and so can avoid doing the rename, but it doesn't seem like we can
handle this in general, i.e. any user-written schema can just do all sorts of
schema modifications under the covers and decide not to check immutability.
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