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Displaying posts with tag: Replication (reset)
MySQL 8.0.14 Replication Enhancements

MySQL 8.0.14 is out and it contains some new and very interesting replication enhancements. As always, we are very pleased to share with you the details about the exciting new features in this release.

This blog post will provide you a summary of the features and subsequent blog posts will dive into the mechanics and details of each one.…

Fun with Bugs #77 - On MySQL Bug Reports I am Subscribed to, Part XIV

Slides for my talk about MySQL bugs at FOSDEM 2019 MySQL, MariaDB and Friends Devroon are ready, support customers decided not to break anything badly on weekend, so I have some free time for blogging.  As usual, when I do not have any better idea or useful recent real life experience to share I write about MySQL bugs.

Today I'd like to continue my review of interesting MySQL bug reports added by Community members in December, 2018. I'll review them starting from the oldest:

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Replication Manager Works with MariaDB

Some time ago I wrote a script to manage asynchronous replication links between Percona XtraDB clusters. The original post can be found here. The script worked well with Percona XtraDB Cluster but it wasn’t working well with MariaDB®.  Finally, the replication manager works with MariaDB.

First, let’s review the purpose of the script. Managing replication links between Galera based clusters is a tedious task. There are many potential slaves and many potential masters. Furthermore, each replication link must have only a single slave. Just try to imagine how you would maintain the following replication topology:

A complex replication topology

The above topology consists of five clusters and four …

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Using dbdeployer With MariaDB Server

Some time ago I've noted that one of the tools I use for testing various MySQL and MariaDB cases and to reproduce potential bugs, MySQL-Sandbox, is not updated any more. It turned out that active development switched to its port in Go called dbdeployer. You can find detailed information about dbdeployer and reasons behind developing it provided by its author, Giuseppe Maxia, here and there. See also this post at Percona blog for some quick review of its main features. One of the points of …

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Fun with Bugs #76 - On MySQL Bug Reports I am Subscribed to, Part XIII

Holidays season is almost over here, so it's time to get back to my main topic of MySQL bugs. Proper MySQL bug reporting will be a topic of my FOSDEM 2019 talk in less than 4 weeks (and few slides with recent examples of bugs are not yet ready), so I have to concentrate on bugs.

Last time in this series I reviewed some interesting bug reports filed in November, 2018. Time to move on and proceed with bugs reported in December, 2018, as I've subscribed to 27 or so of them. As usual, I'll review them briefly starting from the oldest and try to check if MariaDB 10.3 is also affected when the bug report is about common features:

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Fun with Bugs #75 - On MySQL Bug Reports I am Subscribed to, Part XII

From the lack of comments to my previous post it seems everything is clear with ERROR 1213 in different kinds and forks of MySQL. I may still write a post of two about MyRocks or TokuDB deadlocks one day, but let's get back to my main topic of MySQL bugs. Today I continue my series of posts about community bug reports I am subscribed to with a review of bugs reported in November, 2018, starting from the oldest and skipping those MySQL 8 regression ones I've already commented on. I also skip documentation bugs that should be a topic for a separate post one day (to give more illustration to …

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MySQL Binary Log as a Transaction Coordinator

I had the pleasure to receive a nice educative video from my colleague Narendra Singh Chauhan, working in the QA team for MySQL Replication.

If you are curious to understand how all this works, please take a look at the video, like it and share it

Fun with Bugs #74 - On MySQL Bug Reports I am Subscribed to, Part XI

For some reason the Committee of FOSDEM 2019 MySQL, MariaDB & Friends Devroom of all my talks submitted picked up the one on how to create a useful MySQL bug report, so I have no options but continue to write about MySQL bugs, as long and MySQL Community wants and even prefers to listen and read about them... That's what I do, with pleasure.

Today I'll continue my series of posts about community bug reports I am subscribed to with the review of bugs reported since October 1, 2018, starting from the oldest and skipping those MySQL 8 regression ones I've already commented on:

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MySQL High Availability: Stale Reads and How to Fix Them

Continuing on the series of blog posts about MySQL High Availability, today we will talk about stale reads and how to overcome this issue.

The Problem

Stale reads is a read operation that fetches an incorrect value from a source that has not synchronized an update operation to the value (source Wiktionary).

A practical scenario is when your application applies INSERT or UPDATE data to your master/writer node, and has to read it immediately after. If this particular read is served from another server in the replication/cluster topology, the data is either not there yet (in case of an INSERT) or it still provides the old value (in case of an UPDATE).

If your application or part of your application …

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Fun with Bugs #73 - On MySQL Bug Reports I am Subscribed to, Part X

It's time to continue my review of MySQL bug reports that I considered interesting for some reason recently. I had not got any notable reaction from Oracle engineers to my previous post about recent regression bugs in MySQL 8.0.13, so probably this topic is not really that hot. In this boring post I'll just review some bugs I've subscribed to since August that are still not closed, starting from the oldest.

Let me start with a couple of bug reports that remain "Open":

  • Bug #91959 - "UBSAN: signed integer overflow in lock_update_trx_age". It's really unusual to see bug reported by …
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