noblepaul commented on issue #1109: More pervasive use of PackageLoader / PluginInfo URL: https://github.com/apache/lucene-solr/pull/1109#issuecomment-568812967 Technically, Hot-reloading means reloading an object without restarting the JVM. So, it's OK to reload an object by reloading a core. The problem with this PR is that it leaves the system in an inconsistent state. Consider the following scenario - `ComponentX` uses `PackageA` `1.0` - User updates `PackageA` to `2.0` - A core that got started after the package update uses `2.0` & all other cores use `1.0` We really cannot leave the system in an inconsistent state and say we will deal with the inconsistencies in another ticket. What is the solution? There are 2 ways to use packages. 1. Ensure that the plugin has true hot reloading. As it is done for the plugins we support today 2. Or, we identify a list of plugins that do not need to be `hot-reloaded`. If a package is updated and such a plugin is using that package, we just reload the core Wherever possible we strive to implement option#1 because reloading cores can cause instability in the system & we try to minimize it as much as possible. If option#1 is not possible we MUST implement option#2.
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