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Subject [GitHub] [lucenenet] rclabo commented on issue #403: How to use HIGH_COMPRESSION in Lucene.Net 4.8
Date Fri, 22 Jan 2021 13:05:15 GMT

rclabo commented on issue #403:
URL: https://github.com/apache/lucenenet/issues/403#issuecomment-765383722


   @NightOwl888  The more I think about this, it's kinda interesting.  If one uses an IndexWriter
to open the index and then obtains a NRT reader from the IndexWriter then the codec gets hard
coded via either
          `indexConfig.Codec = new Lucene46HighCompressionCodec();`
   or
         `indexConfig.Codec = Codec.ForName("Lucene46HighCompression");`
   
   But if one obtains a reader via `DirectoryReader aReader = DirectoryReader.Open(indexDir);
` then the codec used is selected dynamically based on the codec name stored in the index
header. 
   
   It makes sensed that when obtaining a writer for a new index the codec would need to be
explicitly stated in code, but it's odd that when obtaining a writer for an _existing index_
the codec is not obtained dynamically based on the codec in the header of the index.  Isn't
that lack of symmetry in the design kinda odd?  (I realize this statement is not about Lucene.Net
per se but about Java Lucene design.)
   
   To give flexibility to NRT readers (obtained from an `IndexWriter`) to open indexes with
different codecs, it seems there is probably an easy way to read the codec name from the header
so that the name could be used in ` `indexConfig.Codec = Codec.ForName(nameReadFromHeader);``.
 
   
   Is there an existing API to get this codec name from the header? 


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