[QUESTION] ImportSST::Upload and Ingest rpc method can be used or not ?

[mzygQAQ]

i notice that the upload and ingest methods:
I wonder if it can be used to import SST files into tikv(used with txn-client) ?

kvproto/proto/import_sstpb.proto

Lines 38 to 40 in 8c4cd3f

	rpc Upload(stream UploadRequest) returns (UploadResponse) {}
	// Ingest an uploaded SST file to a region.
	rpc Ingest(IngestRequest) returns (IngestResponse) {}

I checked the source code of some import tools of tidb like tikv-br, tidb-lightning and found that they did not use these two interfaces (upload and ingest), but called importsst:: write / rawwrite. Why?

kvproto/proto/import_sstpb.proto

Lines 50 to 51 in 8c4cd3f

	rpc Write(stream WriteRequest) returns (WriteResponse) {}
	rpc RawWrite(stream RawWriteRequest) returns (RawWriteResponse) {}

[disksing]

/cc @overvenus