[GitHub] [lucene-solr] johann-beessip opened a new pull request #651: Performance improvement for update?optimize=true

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johann-beessip opened a new pull request #651: Performance improvement for update?optimize=true
URL: https://github.com/apache/lucene-solr/pull/651
 
 
   For our use case we have a small number of documents with a large number of docValues.  During optimize we noticed a lot of time being spent in the FilterFieldInfor constructor, on the filterFields.contains(...) function.  
   
   The small change from an ArrayList to a LinkedHashSet reduced our optimize time from 60min to < 1min.
   
   This was added to branch 7_2 as that's the version we're still using, but the issue is still present in master:
   https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/perfield/PerFieldDocValuesFormat.java#L142
   
   
   

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