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https://issues.apache.org/jira/browse/SOLR-14843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17201732#comment-17201732
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Ilan Ginzburg commented on SOLR-14843:
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I think we need to think the hierarchy carefully... Node props being overridden
by cluster props might work, but I can easily think of use cases where the
opposite makes sense as well, for example configuring a one off node in an
otherwise homogeneous cluster, but then system properties and environment
variables (which really are node props) override all the rest...
I believe a proposal needs to also have another dimension of where these
configurations come from. For system properties and environment variables it's
pretty simple, but cluster and node props can be in some central place (ZK) or
can be defined within the Solr distribution (file) and as such can end up being
different on each node (nothing prevents deploying slightly different images on
the nodes, or changing the node config after deploy).
What I really need short term is a way to do what {{solr.xml}} allows me doing
(define default config, let the user change them before deploy if he so
wishes). We do not currently have a replacement for this.
> Define strongly-typed cluster configuration API
> -----------------------------------------------
>
> Key: SOLR-14843
> URL: https://issues.apache.org/jira/browse/SOLR-14843
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Andrzej Bialecki
> Priority: Major
> Labels: clean-api
> Fix For: master (9.0)
>
>
> Current cluster-level configuration uses a hodgepodge of traditional Solr
> config sources (solr.xml, system properties) and the new somewhat arbitrary
> config files kept in ZK ({{/clusterprops.json, /security.json,
> /packages.json, /autoscaling.json}} etc...). There's no uniform
> strongly-typed API to access and manage these configs - currently each config
> source has its own CRUD, often relying on direct access to Zookeeper. There's
> also no uniform method for monitoring changes to these config sources.
> This issue proposes a uniform config API facade with the following
> characteristics:
> * Using a single hierarchical (or at least key-based) facade for accessing
> any global config.
> * Using strongly-typed sub-system configs instead of opaque Map-s:
> components would no longer deal with JSON parsing/writing, instead they would
> use properly annotated Java objects for config CRUD. Config objects would
> include versioning information (eg. lastModified timestamp).
> * Isolating access to the underlying config persistence layer: components
> would no longer directly interact with Zookeeper or files. Most likely the
> default implementation would continue using different ZK files per-subsystem
> in order to limit the complexity of file formats and to reduce the cost of
> notifications for unmodified parts of the configs.
> * Providing uniform way to register listeners for monitoring changes in
> specific configs: components would no longer need to interact with ZK
> watches, they would instead be notified about modified configs that they are
> interested in.
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