Initiating key re-exchange (too much data received)

I'm trying to transfer a rather large file through sftp. I'm getting these lines in the log:
> 2018-03-05 11:10:21.493 Type: SSH_FXP_OPEN, Size: 71, Number: 4172291
< 2018-03-05 11:10:21.494 Type: SSH_FXP_STATUS, Size: 24, Number: 4172036
. 2018-03-05 11:10:21.494 Discarding reserved response
< 2018-03-05 11:10:21.509 Type: SSH_FXP_HANDLE, Size: 13, Number: 4172291
> 2018-03-05 11:10:21.509 Type: SSH_FXP_FSTAT, Size: 13, Number: 4172552
< 2018-03-05 11:10:21.623 Type: SSH_FXP_ATTRS, Size: 37, Number: 4172552
> 2018-03-05 11:10:21.623 Type: SSH_FXP_READ, Size: 25, Number: 4172805
. 2018-03-05 11:28:56.828 Initiating key re-exchange (too much data received)
. 2018-03-05 11:28:56.953 Doing ECDH key exchange with curve Curve25519 and hash SHA-256
. 2018-03-05 11:28:57.293 Initialised AES-256 SDCTR client->server encryption
. 2018-03-05 11:28:57.293 Initialised HMAC-SHA-256 client->server MAC algorithm
. 2018-03-05 11:28:57.293 Initialised AES-256 SDCTR server->client encryption
. 2018-03-05 11:28:57.293 Initialised HMAC-SHA-256 server->client MAC algorithm

My question is, when it initiates a key re-exchange, does that mean it is starting the transfer over? Or will it eventually finish?

The key re-exchange is transparent to the transfer. I.e. it has no impact on it.