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b15f6bf978
Since http2 spec defines the receive windows's size and max size of frame in the stream, the underlayer - gRPC client can pre-read data from server even if the application layer hasn't read it yet. And the initialized cluster has 20KiB snapshot, which can be pre-read by underlayer. We should increase the snapshot's size, just in case that the io.Copy won't return the canceled or timeout error. Fixes: #14477 Signed-off-by: Wei Fu <fuweid89@gmail.com>