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Displaying posts with tag: Group Replication (reset)
Performance Improvements in MySQL 8.0 Replication

MySQL 8.0 became Generally Available (GA) on April 19th, a great moment for us working on MySQL at Oracle. It is now a “fully grown adult” packed with new features, and improvements to existing features, as described here.

This blog post focuses on the impact of replication performance improvements that went into MySQL 8.0.…

MySQL Shell for MySQL 8.0: your best friends in the cloud !

MySQL 8.0.11 seems to be around the corner and the new MySQL Shell will take advantage of all the new improvements made in MySQL 8.0 like SET PERSIST, RESTART, … see this previous post.

In the video below, I show you how easy it’s to deploy a MySQL InnoDB Cluster using the Shell that connects remotely to all the instances:

I …

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MySQL InnoDB Cluster & Group Replication: how to upgrade safely your cluster

Recently on MySQL Forums, somebody was looking for documentation or procedure to upgrade a MySQL InnoDB Cluster (or Group Replication cluster) to a newer version.

In this post I am illustrating the best practices to achieve this task safely.

To illustrate the procedure, I will use an InnoDB Cluster of 3 members: mysql1, mysql2 and mysql3. The cluster is setup in Single-Primary mode (mysql1) and runs MySQL 5.7.21.

Let’s have a look at the cluster status:

 MySQL / mysql1:3306 / JS / cluster.status()
    "clusterName": "MyCluster", 
    "defaultReplicaSet": {
        "name": "default", 
        "primary": "mysql1:3306", 
        "ssl": "DISABLED", 
        "status": "OK", 
        "statusText": "Cluster is ONLINE and can tolerate up to …
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Fun with Bugs #63 - On Bugs Detected by ASan

Among other things Geir Hoydalsvik stated in his nice post yesterday:
 "We’ve fixed a number of bugs detected by UBsan and Asan." This is indeed true, I already noted many related bugs fixed in recent MySQL 8.0.4. But I think that a couple of details are missing in the blog post. First of all, there still a notable number of bugs detected by ASan or noted in builds with ASan that remain "Verified". Second, who actually found and reported these bugs?

I decided to do a quick search and present my summary to clarify these details. Let me start with the list of "Verified" or "Open" bugs in public MySQL bugs database, starting from the oldest one:

  • Bug #69715 - "UBSAN: Item_func_mul::int_op() mishandles …
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dbdeployer release candidate

The latest release of dbdeployer is possibly the last one with a leading 0. If no serious bugs are found in the next two weeks, the next release will bear a glorious 1.0.

Latest news

The decision to get out of the stream of pre-releases that were published until now comes because I have implemented all the features that I wanted to add: mainly, all the ones that I wished to add to MySQL-Sandbox but it would have been too hard:

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Concurrent sandbox deployment

Version 0.3.0 of dbdeployer has gained the ability of deploying multiple sandboxes concurrently. Whenever we deploy a group of sandboxes (replication, multiple) we can use the --concurrent flag, telling dbdeployer that it should run operations concurrently.

What happens when a single sandbox gets deployed? There are six sets of operations:

  1. Create the sandbox directory and write down its scripts;
  2. Run the initialisation script;
  3. Start the database server;
  4. Run the pre-grants SQL commands (if any;)
  5. Load the grants;
  6. Run the post-grants SQL commands (if any;)

When several …

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MySQL 8.0 : more about new authentication plugin and replication

MySQL 8.0’s new default authentication plugin means more secure connections for users connections but also for replication… but you need to be aware of it !

Yesterday Giuseppe – the datacharmer – Maxia, submitted a bug related to a strange behavior of MySQL’s replication.

He observed that after creating a new user for replication (using the new authentication method, caching_sha2_password), when he created the slave as usual, replication was not starting… Slave_IO_Running was constantly in “Connecting” and the Last_IO_Error was:

Last_IO_Error: error connecting to master 'repl2@' - …
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The confusing strategy for MySQL shell

Where the hell is it?

The MySQL shell is a potentially useful tool that has been intentionally made difficult to use properly.

It was introduced, with much fanfare, with the MySQL Document Store, as THE tool to bridge the SQL and no-SQL worlds. The release was less than satisfactory, though: MySQL 5.7.12 introduced a new feature (the X-protocol plugin) bundled with the server. The maturity of the plugin was unclear, as it popped out of the unknown into a GA release, without any public testing. It was allegedly GA quality, although the quantity of bug reports that were filed soon after the release proved otherwise. The maturity of the shell was known as "development preview", and so we had a supposedly GA feature that could only be used with an alpha …

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Meet dbdeployer: the new sandbox maker

How it happened

A few years ago I started thinking about refactoring MySQL-Sandbox. I got lots of ideas and a name for the project (dbdeployer) but went no further. The initial idea (this was 2013!) was to rewrite the project in Ruby: I had been using Ruby at work and it looked like a decent replacement for Perl. My main problem was the difficulty of installation in an uncontrolled environment. If you have control over your environment (it's your laptop or you are in charge of the server configuration via Puppet or similar) then the task is easy. But if you ever need to deploy somewhere with little or no notice, it becomes a problem: there are servers where Perl is not installed, and is common that the server also have a policy forbidding all scripting languages from being deployed. …

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MySQL HA Architecture #1 : InnoDB Cluster & Consul


I received many request about MySQL High Availability Architecture. There are a lot of tools, but how can we use them to achieve MySQL HA without over engineering everything.

To answer such demand, there is no generic architecture, of course there are leaders in solutions, but put them together can result in many different designs, I will start a series of article on that topic. Feel free, as usual to comment, but also recommend other tools that could be used in a future post.

So today’s post is related to MySQL InnoDB Cluster with Hashicorp’s Consul.


This is the overview of the deployed architecture:

As you can see, we have 3 data centers, but in fact we have only two DCs on premises and one in the cloud. A large amount of request are always …

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