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From "Beale, Jim (US-KOP)" <>
Subject Block tree terms dict & index
Date Tue, 30 Apr 2013 23:57:02 GMT
Hello all,

We've just upgraded to 4.2 from 3.6 and suffered some performance degradation in both indexing
and retrieval.  We've had to eliminate compression, even supplying our own NoCompression codec
since there doesn't appear to be any built in support for this.  Hopefully we're not overlooking
something with the compression.  It did reduce the size of our indexes and thus our memory
footprint but we lost more on the LZ4 decompression than we gained by having more free memory.

DocValues didn't help us either.  We attempted to create an in-memory cache, using a separate
index which we closed afterwards and performing a map reduce to speed up access, but we didn't
see any significant performance gains.

What about block tree terms?  What is the use case for that feature?  I noticed that benefits
appeared in the spell correction tests but I'm still not clear about how best to employ the
codec.  Has anyone had any experience with it?

Thanks for any and all insights.

Best regards,
Jim Beale

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