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Displaying posts with tag: Replication (reset)
MySQL Compressed Binary Logs

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On a busy server, the binary logs can end up being one of the largest contributors to amount of disk space used. That means higher I/O, larger backups (you are backing up your binary logs, right?), potentially more network traffic when replicas fetch the logs, and so on. In general, binary logs compress well, so it has been a long time wish for a feature that allowed you to compress the logs while MySQL are still using them. Starting from MySQL 8.0.20 that is now possible. I will take a look at the new feature in this post.

Configuration

The binary log compression feature is controlled by two variables, one for enabling the feature and …

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Known Issue Announcement for Tungsten Products and MySQL 8

On Monday April 27th, MySQL released a much-anticipated patch release 8.0.20. Along with many bug fixes and improvements, a new property was introduced – binlog-transaction-compression. During our own internal testing we have discovered an incompatibility with our Continuent Tungsten products when this property is enabled.

The newly-released binlog-transaction-compression feature is really interesting because it compresses transaction payloads before being written into the binary logs, which in turn reduces the disk space overhead required for storage. I’m sure many users will be keen to implement this, however at this time the use of binlog-transaction-compression=ON will prevent Replication from functioning correctly.

This …

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MySQL 8.0.20 Replication Enhancements

We have just released MySQL 8.0.20. And it has some interesting replication enhancements. In particular one big and exciting feature: binary log compression. Here is the list of things in this release:

  • Binary Log Compression (WL#3549). This work done by Luís Soares implements binary log compression, making use of the popular compression algorithm ZSTD.

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Fun with Bugs #97 - On MySQL Bug Reports I am Subscribed to, Part XXXI

Time for the next blog post about MySQL bugs! The previous one covered some bugs I considered interesting in March, this one will be about community bug reports that I've picked up since March 26, 2020. I'd better review bug fixed in MySQL 5.7.30 instead of this, but it is still not released, even though we know it must get some important security fixes based on "Oracle Critical Patch Update Advisory - April 2020" recently published.

As usual, I am mostly interested in replication, …

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Evaluating Group Replication Scaling for I/O Bound Workloads

In this post, I want to evaluate Group Replication Scaling capabilities in cases when we increase the number of nodes and increase user connections. While this setup is identical to that in my post “Evaluating Group Replication Scaling Capabilities in MySQL”,  in this case, I will use an I/O bound workload.

For this test, I will deploy multi-node bare metal servers, where each node and client are dedicated to an individual server and connected between themselves by a 10Gb network.

Also, I will use 3-nodes and 5-nodes Group Replication setup. In both cases, the load is directed only to ONE node, but I expect with five nodes there is some additional overhead from replication.

Hardware specifications:

System | Supermicro; SYS-F619P2-RTN; v0123456789 (Other)
Service Tag | …
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Evaluating Group Replication with Multiple Writers in MySQL

In this blog, I want to evaluate Group Replication Scaling capabilities to handle several writers, that is, when the read-write connection is established to multiple nodes, and in this case, two nodes. This setup is identical to my previous post, Evaluating Group Replication Scaling Capabilities in MySQL.

For this test, I deploy multi-node bare metal servers, where each node and client are dedicated to an individual server and connected between themselves by a 10Gb network.

I use the 3-nodes Group Replication setup.

Hardware specifications:

System | Supermicro; SYS-F619P2-RTN; v0123456789 (Other)
Service Tag | S292592X0110239C
   Platform | Linux
    Release | Ubuntu 18.04.4 LTS (bionic)
     Kernel | 5.3.0-42-generic
Architecture | CPU = 64-bit, OS = 64-bit
  Threading | NPTL 2.27 …
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Evaluating Group Replication Scaling Capabilities in MySQL

In this blog, I want to evaluate Group Replication Scaling capabilities in cases when we increase the number of nodes and increase user connections.

For testing, I will deploy multi-node bare metal servers, where each node and client are dedicated to an individual server and connected between themselves by a 10Gb network.

Also, I will use 3-nodes and 5-nodes Group Replication setup.

Hardware specifications:

System | Supermicro; SYS-F619P2-RTN; v0123456789 (Other)
Service Tag | S292592X0110239C
   Platform | Linux
    Release | Ubuntu 18.04.4 LTS (bionic)
     Kernel | 5.3.0-42-generic
Architecture | CPU = 64-bit, OS = 64-bit
  Threading | NPTL 2.27
    SELinux | No SELinux detected
Virtualized | No virtualization detected
# Processor ##################################################
 Processors | physical = 2, cores = 40, virtual = 80, hyperthreading = yes
     Models | 80xIntel(R) Xeon(R) Gold 6230 CPU @ …
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Fun with Bugs #96 - On MySQL Bug Reports I am Subscribed to, Part XXX

My weekdays are still busy even during this lockdown period, but weekend is a perfect time for yet another blog post about MySQL bugs I considered interesting. Very few followers read my posts on other topics anyway, especially if they have the "M....DB" word...

So, here is a new list of optimizer, replication, InnoDB and few other bugs in GA versions of MySQL that I've subscribed to since the end of February, 2020:

  • Bug #98675 - "LIMIT clause in derived table garbles EXPLAIN Note". It's not a big deal and in specific case presented by
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Fun with Bugs #95 - On MySQL Bug Reports I am Subscribed to, Part XXIX

With conferences cancelled or postponed and people forced to stay at home due to COVID-19 wide spreading, what can be better than to give my readers a new list of MySQL bugs to check? Useful reading should help! So today I continue my previous post with a quick review of bugs I've subscribed to in February, 2020, while things were still going as usual for most of us...

Here is the list of InnoDB, replication, optimizer and some other bugs to note while working with recent MySQL 5.7.x and 8.0.19 releases:

  • Bug #98473 - "group replication will be block after lock table". This problem report by
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MySQL SSL Enable Replication

This blog post illustrates ” How to setup SSL enabled replication”

By default, mysql package installation creates SSL file in the data directory at the time of installation. If you would like to use different self-signed certificates then create them as described here.

Add SSL setting to my.cnf on all servers.


ssl=on
ssl-ca=/etc/sslcerts/ca.pem
ssl-cert=/etc/sslcerts/server-cert.pem
ssl-key=/etc/sslcerts/server-key.pem

Restart mysql server and verify the settings.

Example: client connections using SSL


#mysql -urpluser -p -P22403 --host 127.0.0.1 --ssl-cert=/etc/sslcerts/client-cert.pem --ssl-key=/etc/sslcerts/client-key.pem -e '\s'
Enter password:
--------------

Connection id: 5
Current database:
Current user: rpluser@localhost
SSL: Cipher in use is DHE-RSA-AES256-SHA
Current …
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