Pl18 saving bandwidth

Apr 25, 2018Download as PPTX, PDF0 likes44 views

This document discusses efforts to reduce bandwidth usage when retrieving data from a MySQL database. It describes how metadata packets increase the size of the response from a SELECT query. The team implemented changes that allow clients to request data without metadata, reducing response sizes by over 300% in some cases. The changes were a collaborative effort between Oracle, Twitter, Facebook, and others.

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
Saving Bandwidth
Georgi Kodinov
Team Lead, MySQL SrvGen Team
The case of missing metadata

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
Agenda
2
 Network footprint of a SELECT
 How not to send the stuff you don’t need
 The outcome of our efforts

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
Let’s Start With an Example
• CREATE TABLE mysqlers (
pk_column INTEGER PRIMARY KEY,
first_name VARCHAR(20),
last_name VARCHAR(20),
years_in_mysql INTEGER,
joining_date DATE);
• INSERT INTO mysqlers VALUES(1, 'Georgi', 'Kodinov', 12, '2006-03-13');
• SELECT * FROM mysqlers;
3

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
Network Footprint Of a SELECT
Gathering data and making sense of it
4

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. | 5
The
Response
Summary1 count packet
5
column
metadata
packets
1 result row
packet
1 OK/EOF
packet

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
• Request: 81 bytes on the wire
– 27 bytes TCP
– 23 bytes COM_QUERY
– 22 bytes SQL query text
• Reply: 443 bytes on the wire
– 389 bytes TCP
– 32 bytes MySQL (packet # and length)
– LPacket1: 1 b: Meta count
– LPacket2: 60 b: Meta of pk_column
– LPacket3: 62 b: Meta of first_name
– LPacket4: 60 b: Meta of last_name
– LPacket5: 70 b: Meta of years_in_mysql
– LPacket6: 66 b: Meta of joining_date
– LPacket7: 31 b: Row Data
– LPacket8: 7 b: OK/EOF
6
Network Footprint of mysql_query(): Details

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
Query Text
27%
MySQL
6%TCP
67%
Request
MySQL
9%
Metadata
72%
Data
7%
TCP
12%
Reply
7
Network Footprint of mysql_query()

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
How Not To Send
The Stuff You Don’t Need
8

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
First Naïve Attempt
9

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
A Sample SELECT Program
10
We can
deal with
no
metadata
SSL off so
we can
trace
We don’t
need
metadata !
Check lack
of
metadata
Data still
here

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
The Outcome
Of Our Efforts
11

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
A Sample SELECT Program: it works !
12
But How about the Network ?

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
A Very Different Picture
13
106 Bytes !
It used to be 443 !
The metadata sub-
packets are gone !

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
The “Before” And “After” Image: 320% Lost !
0
50
100
150
200
250
300
350
400
450
500
54 54
40 20
338
0
35
35
BYTES
Data
Metadata
MySQL
TCP
14

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
It Was a True Team Effort !
• “Thank you” goes to:
– Davi Arnaut @ Twitter
– Facebook
– Ramil Kalimulin
– The MySQL team @ Oracle
15

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
Tools Used
• Wireshark
– https://www.wireshark.org/
• Oracle MySQL 8.0 client and server
– https://dev.mysql.com/downloads/mysql/8.0.html
• Protocol Doxygen in MySQL 8.0
– https://dev.mysql.com/doc/dev/mysql-server/latest/PAGE_PROTOCOL.html
16

Copyright © 2018, Oracle and/or its affiliates. All rights reserved. |
Safe Harbor Statement
The preceding is intended to outline our general product direction. It is intended for
information purposes only, and may not be incorporated into any contract. It is not a
commitment to deliver any material, code, or functionality, and should not be relied upon
in making purchasing decisions. The development, release, and timing of any features or
functionality described for Oracle’s products remains at the sole discretion of Oracle.
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