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Posted to issues@solr.apache.org by "Jan Høydahl (Jira)" <ji...@apache.org> on 2023/02/16 08:59:00 UTC
[jira] [Commented] (SOLR-15959) Deprecate loading of solr.xml from ZK
[ https://issues.apache.org/jira/browse/SOLR-15959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689627#comment-17689627 ]
Jan Høydahl commented on SOLR-15959:
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Circling back to this topic. On the user list thread https://lists.apache.org/thread/cv0hbxrj6dpgvg98jhfwlb9dqjtr8htd there was no real push-back or arguments for why to keep it in ZK, particularly now that you can start a Solr node with an empty SOLR_HOME and it will pull the default solr.xml from the release. Thus I'll proceed with deprecation in 9.2 and removal in 10.0.
> Deprecate loading of solr.xml from ZK
> -------------------------------------
>
> Key: SOLR-15959
> URL: https://issues.apache.org/jira/browse/SOLR-15959
> Project: Solr
> Issue Type: Improvement
> Reporter: Jan Høydahl
> Priority: Major
>
> In SOLR-7735, five years ago (committed by me) we allowed loading of solr.xml from zookeeper.
> Part of the motivation back then was to be able to put {{solr.xml}} in a central place and not being forced to initialize {{SOLR_HOME}} with that file, similar to the goal of SOLR-9575. And perhaps also an easy way to update solr.xml.
> However, I think it may have been a mistake that should be deprecated and ultimately removed. Why? The {{solr.xml}} file is the "node config" for solr. Where you set node-level props that need to be there at early node startup. So even if you change the file in ZK, nodes will have not way of reloading those plugins dynamically without a restart
> The file may even contain local-node-specific settings that shuold differ from node to node. Especially during rolling upgrade, it may be important to be able to have a different {{solr.xml}} on the new nodes and on the old ones. With property substitution you can do some of that, but you cannot add XML tags with a sysprop.
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