Sharing a key in room of > 500 devices fails

[bwindels]

/keys/claim queries are not chunked

This is why the graph here doesn't go further: matrix-org/matrix-rust-sdk#170 (comment)

When needing to setup a lot of olm sessions at once, claiming the OTKs should be chunked in chunks of 250-500 users (larger chunks are faster, but rust-sdk uses 250 I think), otherwise key sharing in rooms > 500 devices will fail.

[bwindels]

Hmmm, just looked into this a bit, and I am wondering how 4ca5ff9 (from well before this report) does not chunk the /keys/claim queries to max 20 devices...