Upload operation using multiple connections

• US 10,084,839 B2
• Filed: 12/27/2013
• Issued: 09/25/2018
• Est. Priority Date: 12/27/2013
• Status: Active Grant

• Current Assignee: SAP SE
• Original Assignee: SAP SE
• Inventors: Boshev, Stoyan, Ilev, Hristo, Yousouf, Shenol, Gerginov, Georgi
• Primary Examiner(s): Lazaro, David R
• Application Number:
  US14/141,489
• Publication Number:
  US 20150188969A1
• Time in Patent Office: 1,733 Days
• CPC Class Codes: G06F 9/544 Buffers; Shared memory; Pipes
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/43 Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 67/06 specially adapted for file transfer, e.g. file transfer protocol [FTP]
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols

Abstract

A client system requests to upload an input data stream to a server system. The input data stream is split to a sequence of chunks. The chunks are transferred in parallel by a number of connections from the client system to the server system. At the server system, the transferred chunks are merged into an output stream according to the sequence. The output stream represents the rebuilt input stream.

Claims

1. A computer implemented method to receive data through a plurality of connections, the method comprising:

receiving a request to establish the plurality of connections;

sending a response to the request comprising an identifier of an upload operation and a location to be polled for status of the upload operation;

creating a plurality of connection reader threads corresponding to the plurality of connections, wherein the plurality of connection reader threads corresponds to a plurality of server buffers;

receiving a sequence of chunks at the plurality of connection reader threads through the plurality of connections, wherein each of the plurality of connections is associated with the identifier of the upload operation;

reading, via a connection reader thread of the plurality of connection reader threads, one or more chunks from the sequence of chunks;

writing the one or more chunks from the sequence of chunks to a server buffer of the plurality of server buffers, wherein the connection reader thread from the plurality of connection reader threads corresponds to the server buffer;

searching in the plurality of server buffers for a chunk with a consecutive number expected next for an output data stream;

when the chunk with the consecutive number expected next is missing in the plurality of server buffers, blocking the connection reader thread and the server buffer until the chunk with the consecutive number expected next is read by a different connection reader thread of the plurality of connection reader threads;

when the chunk with the consecutive number next expected is read by the different connection reader thread, adding the chunk with the consecutive number expected next to the output data stream; and

merging chunks from the plurality of server buffers into the output data stream according to the sequence.

2. The method of claim 1, wherein receiving the sequence of chunks at the plurality of connection reader threads further comprises:

at a client system;

reading in chunks an input data stream by a feeder thread, wherein a chunk from the sequence of chunks includes a chunk identifier representing a consecutive number of the chunk in the sequence and a size of the chunk;

writing the sequence of chunks into a client buffer, wherein the sequence of chunks to be read from the client buffer by a plurality of connection sender threads; and

upon reading the input data stream, the feeder thread notifying the plurality of connections that the input data stream has been read.

3. The method of claim 1, further comprising:

upon determining that a consecutive number of the read chunk is next in the sequence of chunks expected, rebuilding an input data stream by merging the read chunk to the output data stream according to the sequence of chunks.

4. The method of claim 1, further comprising:

upon determining that a consecutive number of the read chunk is different from an expected consecutive number, writing the chunk to a corresponding server buffer from the plurality of server buffers.

5. The method of claim 1 further comprising:

when the plurality of connections is closed, receiving a polling request for the status of the upload operation, wherein the polling request comprises the identifier of the upload operation; and

sending a response comprising the status of the upload operation.

6. A computer system to receive data by a plurality of connections, the system comprising:

a memory to store computer executable instructions;

at least one computer processor coupled to the memory to execute the instructions, to perform operations comprising;

receiving a request to establish the plurality of connections;

sending a response to the request comprising an identifier of an upload operation and a location to be polled for status of the upload operation;

creating a plurality of connection reader threads corresponding to the plurality of connections, wherein the plurality of connection reader threads corresponds to a plurality of server buffers;

receiving a sequence of chunks at the plurality of connection reader threads through the plurality of connections, wherein each of the plurality of connections is associated with the identifier of the upload operation;

reading, via a connection reader thread of the plurality of connection reader threads, one or more chunks from the sequence of chunks;

writing the one or more chunks from the sequence of chunks to a server buffer of the plurality of server buffers, wherein the connection reader thread from the plurality of connection reader threads corresponds to the server buffer;

searching in the plurality of server buffers for a chunk with a consecutive number expected next for an output data stream;

when the chunk with the consecutive number expected next is missing in the plurality of server buffers, blocking the connection reader thread and the server buffer until the chunk with the consecutive number expected next is read by a different connection reader thread of the plurality of connection reader threads;

when the chunk with the consecutive number expected next is read by the different connection reader thread, adding the chunk with the consecutive number expected next to the output data stream; and

merging chunks from the plurality of server buffers into the output data stream.

7. The system of claim 6, wherein the operations further comprising:

at a client system;

reading in chunks an input data stream by a feeder thread, wherein a chunk from the sequence of chunks includes a chunk identifier representing a consecutive number of the chunk in the sequence and a size of the chunk;

writing the sequence of chunks into a client buffer, wherein the sequence of chunks to be read from the client buffer by a plurality of connection sender threads; and

upon reading the input data stream, the feeder thread notifying the plurality of connections that the input data stream has been read.

8. The system of claim 6, wherein:

the plurality of server buffers to store chunks transferred by the plurality of connection reader threads, and the corresponding connection reader thread from the plurality of connection reader threads reading a chunk from the one or more chunks sent by a corresponding connection sender thread from a plurality of connection sender threads.

9. The system of claim 8, wherein the operations further comprising:

upon determining that a consecutive number of the read chunk is next in the sequence of chunks expected, rebuilding an input data stream by merging the read chunk to the output data stream according to the sequence of chunks.

10. The system of claim 8, wherein the operations further comprising:

upon determining that a consecutive number of the read chunk is different from the expected consecutive number, writing the chunk to a corresponding server buffer from the plurality of server buffers.

11. The system of claim 6, wherein the operations further comprising:

when the plurality of connections is closed, receive a polling request for the status of the upload operation, wherein the polling request comprises the identifier of the upload operation; and

send a response comprising the status of the upload operation.

12. A non-transitory computer readable storage medium having instructions encoded thereon that, when executed by a processor, cause the processor to perform operations comprising:

receive a request to establish a plurality of connections;

send a response to the request comprising an identifier of an upload operation and a location to be polled for status of the upload operation;

create a plurality of connection reader threads corresponding to the plurality of connections, wherein the plurality of connection reader threads corresponds to a plurality of server buffers;

receive a sequence of chunks at the plurality of connection reader threads through the plurality of connections, wherein each of the connections of the plurality of connections is associated with the identifier of the upload operation;

read, via a connection reader thread of the plurality of connection reader threads, one or more chunks from the sequence of chunks;

write the one or more chunks from the sequence of chunks to a server buffer of the plurality of server buffers, wherein the connection reader thread from the plurality of connection reader threads corresponds to the server buffer;

search in the plurality of server buffers for a chunk with a consecutive number expected next for an output data stream;

when the chunk with the consecutive number expected next is missing in the plurality of server buffers, block the connection reader thread and the server buffer until the chunk with the consecutive number expected next is read by a different connection reader thread of the plurality of connection reader threads;

when the chunk with the consecutive number expected next is read by the different connection reader thread, add the chunk with the consecutive number expected next to the output data stream; and

merge chunks from the plurality of server buffers into the output data stream.