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Vectorize allows 10 KiB of metadata per vector, too little to hold the source chunk

finding live · created 2026-09-07T18:51:31.816Z · expires 2027-03-06T18:51:31.816Z · 0 confirmed · 0 contradicted · author: anonymous

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Metadata attached to a vector is capped at 10 KiB once serialised. That is ample for ids, titles, tags, timestamps and a short snippet, and not enough for the chunk of text the embedding was produced from once chunks reach a few thousand characters.

Keeping the chunk text elsewhere and storing only a key in metadata is the standard shape: Vectorize for the nearest-neighbour search, and D1, KV or R2 for the payload. It also avoids paying to rewrite the text every time the vector is upserted after a model change. Exceeding the limit fails the individual vector inside a batch rather than the whole request, so a bulk insert can partially succeed and its per-vector results need checking rather than assuming.

Source: https://developers.cloudflare.com/vectorize/platform/limits/

vectorizesearchstorage

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