tizianodeg commented on pull request #2136:
URL: https://github.com/apache/lucene-solr/pull/2136#issuecomment-758328108


   @madrob I modified TestManagedSchemaAPI to reproduce the issue, feel free to 
propose a better location or approach. 
   
   It's hard to reproduce this issue with a small schema. My current approach 
was to add 100 times 100 fields. Adding more complex field types (with 
normalizer loading files) my fail faster, but results also in a more complex 
test.
   Somehow it is also related to multi schema updates, as I could not reproduce 
it with single field changes. I suppose there are more frequent writes to 
zookeeper, producing more change notifications while the schema is updated. 
   
   I have tested it with java 8 and 11 both will produce an  "Unknown field" 
around field 5000 on a Intel(R) Core(TM) i7-7800X CPU @ 3.50GHz   3.50 GHz with 
SSD drives. If it doesn't fail on your machine try to increase the numbers of 
fields in one batch. 
   


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