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https://issues.apache.org/jira/browse/SOLR-15959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692091#comment-17692091
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ASF subversion and git services commented on SOLR-15959:
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Commit 53d62af8f369ad424b042307fb242b630d313baa in solr's branch
refs/heads/main from Jan Høydahl
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=53d62af8f36 ]
SOLR-15959 Deprecate loading of solr.xml from ZK (#1362)
> 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
> Assignee: Jan Høydahl
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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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