mayya-sharipova commented on pull request #728:
URL: https://github.com/apache/lucene/pull/728#issuecomment-1059202282
@jtibshirani Thanks a lot for your review.
> If a user had 100 vector fields, then now we might have 100+ files being
written concurrently, multiplied by the number of segments we're writing at the
same time. It seems like this could cause problems -- should we only use this
strategy if there are a relatively small number of vector fields?
That's a good concern, and the way you suggested to address looks reasonable
to me. I can explore this in subsequent work, if we decide to keep this
approach
> It feels wasteful to be writing the vectors to a temp file in
IndexingChain, then immediately reading and writing them to a temp file again
Lucene91HnswVectorsWriter. I wonder if we could make a top-level
OffHeapVectorValues class that's more broadly visible, so that
Lucene91HnswVectorsWriter could just check if it's dealing with a file-backed
vector values and avoid creating another one?
I had the same thought and was intending to explore this in subsequent work.
One thing to note for now, is copying data like this takes almost no time,
except we temporarily occupying extra disk space while the graph is being built.
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