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  1. Solr
  2. SOLR-4652

Resource loader has broken behavior for solr.xml plugins (basically ShardHandlerFactory)



    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 4.2
    • 4.3, 6.0
    • None
    • None


      I have the following scenario:
      MyShardHandlerFactory is plugged in via solr.xml. The jar containing MyShardHandlerFactory is in the shared lib dir. There are a couple issues:

      1. From within a per core handler (that is loaded within the core's lib dir), you grab the ShardHandlerFactory from CoreContainer, casting to MyShardHandlerFactory will results in a ClassCastException with a message like "cannot cast instance of MyShardHandlerFactory to MyShardHandlerFactory".

      2. Adding a custom dir for shared lib (for example "mylib") does not work. The ShardHandlerFactory is initialized before sharedLib is loaded.

      I've been pouring through the code on this and I don't see an easy fix. I'll keep looking at it, but I wanted to get this up so hopefully others have some thoughts on how best to fix. IMO, it seems like there needs to be a clear chain of resource loaders (one for loading solr.xml, a child for loading the lib dir, used for solr.xml plugins, a grandchild for per core config, and a great grandchild for per core lib dir based plugins). Right now there are some siblings, because any place a SolrResourceLoader is created with a null parent classloader, it gets the jetty thread's classloader as the parent.


        1. SOLR-4652.patch
          6 kB
          Uwe Schindler
        2. SOLR-4652.patch
          10 kB
          Ryan Ernst
        3. SOLR-4652.patch
          8 kB
          Ryan Ernst



            uschindler Uwe Schindler
            rjernst Ryan Ernst
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