Pure Python Implementation of MySQL replication protocol build on top of PyMYSQL. This allow you to receive event like insert, update, delete with their datas and raw SQL queries.
- MySQL to NoSQL database replication
- MySQL to search engine replication
- Invalidate cache when something change in database
- Audit
- Real time analytics
A work in progress documentation is available here: https://python-mysql-replication.readthedocs.org/en/latest/
pip install mysql-replication
You can get support and discuss about new features on: https://groups.google.com/d/forum/python-mysql-replication
The current project is a proof of concept of what you can do with the MySQL replication log.
The project is test with:
- MySQL 5.5 and 5.6
- Python 2.7
- Python 3.2
It's not tested in real production situation.
GEOMETRY field is not decoded you will get the raw data.
Only binlog_row_image=full is supported (it's the default value).
- Mysql River Plugin for ElasticSearch: https://github.com/scharron/elasticsearch-river-mysql
In your MySQL server configuration file you need to enable replication:
[mysqld]
server-id = 1
log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
binlog-format = row #Very important if you want to receive write, update and delete row events
All examples are available in the examples directory
This example will dump all replication events to the console:
from pymysqlreplication import BinLogStreamReader
mysql_settings = {'host': '127.0.0.1', 'port': 3306, 'user': 'root', 'passwd': ''}
stream = BinLogStreamReader(connection_settings = mysql_settings)
for binlogevent in stream:
binlogevent.dump()
stream.close()For this SQL sessions:
CREATE DATABASE test;
use test;
CREATE TABLE test4 (id int NOT NULL AUTO_INCREMENT, data VARCHAR(255), data2 VARCHAR(255), PRIMARY KEY(id));
INSERT INTO test4 (data,data2) VALUES ("Hello", "World");
UPDATE test4 SET data = "World", data2="Hello" WHERE id = 1;
DELETE FROM test4 WHERE id = 1;Output will be:
=== RotateEvent ===
Date: 1970-01-01T01:00:00
Event size: 24
Read bytes: 0
=== FormatDescriptionEvent ===
Date: 2012-10-07T15:03:06
Event size: 84
Read bytes: 0
=== QueryEvent ===
Date: 2012-10-07T15:03:16
Event size: 64
Read bytes: 64
Schema: test
Execution time: 0
Query: CREATE DATABASE test
=== QueryEvent ===
Date: 2012-10-07T15:03:16
Event size: 151
Read bytes: 151
Schema: test
Execution time: 0
Query: CREATE TABLE test4 (id int NOT NULL AUTO_INCREMENT, data VARCHAR(255), data2 VARCHAR(255), PRIMARY KEY(id))
=== QueryEvent ===
Date: 2012-10-07T15:03:16
Event size: 49
Read bytes: 49
Schema: test
Execution time: 0
Query: BEGIN
=== TableMapEvent ===
Date: 2012-10-07T15:03:16
Event size: 31
Read bytes: 30
Table id: 781
Schema: test
Table: test4
Columns: 3
=== WriteRowsEvent ===
Date: 2012-10-07T15:03:16
Event size: 27
Read bytes: 10
Table: test.test4
Affected columns: 3
Changed rows: 1
Values:
--
* data : Hello
* id : 1
* data2 : World
=== XidEvent ===
Date: 2012-10-07T15:03:16
Event size: 8
Read bytes: 8
Transaction ID: 14097
=== QueryEvent ===
Date: 2012-10-07T15:03:17
Event size: 49
Read bytes: 49
Schema: test
Execution time: 0
Query: BEGIN
=== TableMapEvent ===
Date: 2012-10-07T15:03:17
Event size: 31
Read bytes: 30
Table id: 781
Schema: test
Table: test4
Columns: 3
=== UpdateRowsEvent ===
Date: 2012-10-07T15:03:17
Event size: 45
Read bytes: 11
Table: test.test4
Affected columns: 3
Changed rows: 1
Affected columns: 3
Values:
--
* data : Hello => World
* id : 1 => 1
* data2 : World => Hello
=== XidEvent ===
Date: 2012-10-07T15:03:17
Event size: 8
Read bytes: 8
Transaction ID: 14098
=== QueryEvent ===
Date: 2012-10-07T15:03:17
Event size: 49
Read bytes: 49
Schema: test
Execution time: 1
Query: BEGIN
=== TableMapEvent ===
Date: 2012-10-07T15:03:17
Event size: 31
Read bytes: 30
Table id: 781
Schema: test
Table: test4
Columns: 3
=== DeleteRowsEvent ===
Date: 2012-10-07T15:03:17
Event size: 27
Read bytes: 10
Table: test.test4
Affected columns: 3
Changed rows: 1
Values:
--
* data : World
* id : 1
* data2 : Hello
=== XidEvent ===
Date: 2012-10-07T15:03:17
Event size: 8
Read bytes: 8
Transaction ID: 14099
Be carefull tests will reset the binary log of your MySQL server.
Make sure you have the following configuration set in your mysql config file (usually my.cnf on development env):
log-bin=mysql-bin
server-id=1
binlog_do_db=pymysqlreplication_test
binlog-format = row #Very important if you want to receive write, update and delete row events
To run tests:
python setup.py test
- Kodoma: Ruby-binlog based MySQL replication listener https://github.com/y310/kodama
- MySQL Hadoop Applier: C++ version http://dev.mysql.com/tech-resources/articles/mysql-hadoop-applier.html
- MySQL binlog from Jeremy Cole was a great souce of knowledge about MySQL replication protocol https://github.com/jeremycole/mysql_binlog
- Samuel Charron for his help https://github.com/scharron
- bjoernhaeuser for his bugs fixing and improvements https://github.com/bjoernhaeuser
- Dvir Volk for bug fix https://github.com/dvirsky
- Lior Sion code cleanup and improvements https://github.com/liorsion
- Lx Yu code improvements https://github.com/lxyu
Copyright 2012 Julien Duponchelle
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.