Constant GETDATA_SENT_BYTES_LIMIT

pub const GETDATA_SENT_BYTES_LIMIT: usize = 1_000_000;

The number of bytes the Inbound service will queue in response to a single block or transaction request, before ignoring any additional block or transaction IDs in that request.

This is the same as zcashd’s default send buffer limit: https://github.com/zcash/zcash/blob/829dd94f9d253bb705f9e194f13cb8ca8e545e1e/src/net.h#L84 as used in ProcessGetData(): https://github.com/zcash/zcash/blob/829dd94f9d253bb705f9e194f13cb8ca8e545e1e/src/main.cpp#L6410-L6412