One step to complete MySQL migration to Redis

Moving a big table from MySQL to Redis, you'll find that the slow speed you get when extracting, converting, or loading a row of data is unbearable. I'm going to tell you a little trick to get you out of here. Use the "Pipeline output" method to pass the contents of the MySQL command line directly to the REDIS-CLI, in order to bypass the "middleware" way to make the two in the data operation to achieve the best speed.

A MySQL table of about 8 million rows of data, originally imported into Redis takes 90 minutes, and it takes only two minutes to use this method. Whether you believe it or not, I believe it anyway.

MySQL-to-redis data protocol

The REDIS-CLI command-line tool has a bulk insert mode that is specifically designed for batch execution commands. The first step is to format the contents of the MySQL query into REDIS-CLI available data formats. Here we go!

My Table of statistics:

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1234567

CREATE TABLE events_all_time (  id int(11) unsigned NOT NULL AUTO_INCREMENT,  action varchar(255) NOT NULL,  count int(11) NOT NULL DEFAULT 0,  PRIMARY KEY (id),  UNIQUE KEY uniq_action (action));

The Redis commands that are prepared to execute in each row of data are as follows:

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1	HSET events_all_time [action] [count]

Follow the Redis command rules above to create a events_to_redis.sql file that is used to generate the SQL for the Redis Data protocol format:

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123456789101112131415161718192021

-- events_to_redis.sqlSELECT CONCAT(  "*4\r\n",  ‘$‘, LENGTH(redis_cmd), ‘\r\n‘,  redis_cmd, ‘\r\n‘,  ‘$‘, LENGTH(redis_key), ‘\r\n‘,  redis_key, ‘\r\n‘,  ‘$‘, LENGTH(hkey), ‘\r\n‘,  hkey, ‘\r\n‘,  ‘$‘, LENGTH(hval), ‘\r\n‘,  hval, ‘\r‘)FROM (  SELECT  ‘HSET‘ as redis_cmd,  ‘events_all_time‘ AS redis_key,  action AS hkey,  count AS hval  FROM events_all_time) AS t

OK, execute with the following command:

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1	mysql stats_db --skip-column-names --raw < events_to_redis.sql | redis-cli --pipe

Important MySQL Parameter description:
--raw: Make MySQL do not convert the line break in field values.
--skip-column-names: Does not include the column name in each line of MySQL output.

One step to complete MySQL migration to Redis