Robert Engels wrote:
Doesn't this cause a problem for highly interactive and large indexes? Since
every update to the index requires the rewriting of the norms, and
constructing a new array.

The original complaint was primarily about search-time memory size, not update speed. I like the proposed patch which addresses both. I was simply noting that there is a way, without patching, to address the memory issue.

How expensive is the maintining of the norms on disk, at least in regards to
index merging?

Norm processing is simple & fast. But with thousands of rarely used fields it could become a significant factor in update speed. As with all performance questions, the answer requires benchmarking.

Doug

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