With each record batch, the node sends the index in the bucket file (either as a file offset or a count index) of the last record included. If an error happens, after re-connection the client can tell the node the last index so it can carry on from that point.
With each record batch, the node sends the index in the bucket file (either as a file offset or a count index) of the last record included. If an error happens, after re-connection the client can tell the node the last index so it can carry on from that point.