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Displaying posts with tag: Replication (reset)
Fun with Bugs #67 - On Some Public Bugs Fixed in MySQL 8.0.11 GA

I stopped reviewing MySQL Release Notes for quite a some time, but major GA releases of MySQL do not happen often, so I decided to make an exception and write about some bugs from Community users fixed in MySQL 8.0.11 GA.

I'll start with good news about MySQL 8.0.11 GA! You can get sources at GitHub, and I had no problems to build on Fedora 27 on my good old QuadCore box, using the following cmake command line:
[openxs@fc23 mysql-server]$ cmake . -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_CONFIG=mysql_release -DFEATURE_SET=community -DWITH_EMBEDDED_SERVER=OFF -DDOWNLOAD_BOOST=1 -DWITH_BOOST=/home/openxs/boost …

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Some bugs and spring pilgrimage to Percona Live Santa Clara 2018

I am now in an airport, waiting for one of the four flights that will bring me to Percona Live Santa Clara 2018.  This is a good time to write some details about my tutorial on parallel replication.  But before talking about Percona Live, I will share thoughts on MySQL/MariaDB bugs that caught my attention in the last weeks/months (Valeriy: you clearly have an influence on me).

MySQL/MariaDB

MySQL 8.0: New Features in Replication

It is with extreme delight and a big smile on our face that we share the news that a new major MySQL release has been declared Generally Available (GA). The road to MySQL 8 was pretty eventful, sometimes painful and sometimes hard, always challenging, but nonetheless a great ride and an extremely rewarding journey for the engineers that have worked on it.…

Tungsten Clustering 5.3.1 and Tungsten Replicator 5.3.1 are now available!

Continuent are pleased to announce that the new 5.3.1 release is now available for all our customers.

This is a key bug fix and feature release, the key component of which is the final piece of the support for extracting data types from MySQL 5.7 with the Geometry data type.

Key improvements within Tungsten Clustering:

  • Full Support for MySQL data types with the addition of Geometry datatype
  • Fixed an issue where large memory dumps could be collected during a failure
  • Fixed some issues to ensure compatibility with upcoming products

Key improvements within Tungsten Replicator:

  • Full Support for MySQL data types with the addition of Geometry datatype

It’s important to note that due to the addition of support for the geometry datatype, THL written with Geometry data will no longer be readable by …

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Fun with Bugs #66 - On MySQL Bug Reports I am Subscribed to, Part VI

I have some free time today, but I am still lazy enough to work on numerous planned and pending "ToDo" kind of posts, so why not to continue review of older MySQL bugs I am subscribed to. Today I am going to list 15 more bugs reported more than a year ago and still not fixed:

  • Bug #85805 - "Incorrect ER_BAD_NULL_ERROR after LOAD DATA LOCAL INFILE". This detailed bug report by Tsubasa Tanaka stays "Verified" for more than a year already. It's a great example of gdb use for MySQL troubleshooting. Setting a couple of breakpoints may really help to understand how MySQL works and why some …
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Fun with Bugs #65 - On MySQL Bug Reports I am Subscribed to, Part V

I think it's time to review some bugs I've subscribed to several months ago, those older than in the first post from this series. There are several really serious bugs in the list of 15 below:

  • Bug #87560 - "XA PREPARE log order error in replication and binlog recovery". This bug was reported by Wei Zhao, who also provided patches.
  • Bug #87526 - "The output of 'XA recover convert xid' is not useful". This bug reported by Sveta Smirnova is well known and is a real pain for DBAs who have to deal with incomplete XA transactions after some crash or unexpected restart. Check  …
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Test MySQL 8.0 right in your computer

MySQL 8.0 GA is right around the corner. I don't have precise information about its release, as I don't work at Oracle. If I did, I would probably know, but I couldn't tell when the release is scheduled to appear because of company policies. I can, however, speculate and infer, based of my experience with previous releases. My personal assessment is that the release will appear before 9:00am PT on April 24, 2018. The "before" can be anything from a few minutes to one week in advance.
Then, again, it may not happen at all if someone finds an atrocious bug that needs to be fixed asap.

Either way, users are keen on testing the new release in its current state of release candidate. Here I show a few methods that allow you to have a taste of the new …

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Fun with Bugs #64 - On MySQL Bug Reports I am Subscribed to, Part IV

I've subscribed to more than 15 new MySQL bug reports since the previous post in this series, so it's time for a new one. I am trying to follow important, funny or hard to process bug reports every day. Here is the list of the most interesting recent ones starting from the latest (with several still not processed properly):

  • Bug #90211 - "Various warnings and errors when compiling MySQL 8 with Clang".  Roel Van de Paar and Percona in general continue their QA efforts in a hope to make MySQL 8 better. Current opinion of Oracle …
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Multi-Source Replication Performance with GTID

In this blog post, we’ll look at the performance of multi-source replication with GTID.

Multi-Source Replication is a topology I’ve seen discussed recently, so I decided to look into how it performs with the different replication concepts. Multi-source replication use replication channels, which allow a slave to replicate from multiple masters. This is a great way to consolidate data that has been sharded for production or simplify the analytics process by using the same server. Since multiple masters are taking writes, care is needed to not overlook the slave. The traditional replication concept uses the binary log file name, and the position inside that file.

This was the standard until the release of global transaction identifiers (GTID). I have set up a test environment to validate which concept would perform better, and be a better choice for use in this topology.

SETUP

My test suite …

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Percona XtraDB Cluster, MySQL Asynchronous Replication and log-slave-updates

Recently, I’ve been looking into issues with the interactions between MySQL asynchronous replication and Galera replication. In this blog post, I’d like to share what I’ve learned.

MySQL asynchronous replication and Galera replication interactions are complicated due to the number of factors involved (Galera replication vs. asynchronous replication, replication filters, and row-based vs. statement-based replication). So as a start, I’ll look at an issue that came up with setting up an asynchronous replication channel between two Percona XtraDB Cluster (PXC) clusters.

Here’s a view of the desired topology:

The Problem

We want to set up an asynchronous replication channel between two PXC …

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