final int pipelineSize,
final long minBytesRcvd,
final long maxBytesRcvd,
final long latestGenerationStamp,
DataChecksum requestedChecksum) throws IOException {
ClientOperationHeaderProto header = DataTransferProtoUtil.buildClientHeader(
blk, clientName, blockToken);
ChecksumProto checksumProto =
DataTransferProtoUtil.toProto(requestedChecksum);