DiskDocValues is a codec (or part of a codec, apparenlty) for accessing the DocValues from disk, with minimal RAM usage for things like offsets. Lucene42Codec alternatively puts all of DocValues in RAM. Is the actual disk resident data format the same between them? And how do you pick & choose the formats? i.e. can I use Lucene42Codec for all the non-DocValues stuff but then use DiskDocValues so that I can let the OS's cache govern access to DV data while lowering my Java heap and giving the GC a break. Ok I'm going to answer the 2nd question as I just discovered Lucene42Codec.getDocValuesFormatForField which I can customize. But that still leaves the 1st question. It would be nice to not have to re-index.
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