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Displaying posts with tag: Percona Software (reset)
Percona Kubernetes Operator for Percona XtraDB Cluster: HAProxy or ProxySQL?

Percona Kubernetes Operator for Percona XtraDB Cluster comes with two different proxies, HAProxy and ProxySQL. While the initial version was based on ProxySQL, in time, Percona opted to set HAProxy as the default Proxy for the operator, without removing ProxySQL. 

While one of the main points was to guarantee users to have a 1:1 compatibility with vanilla MySQL in the way the operator allows connections, there are also other factors that are involved in the decision to have two proxies. In this article, I will scratch the surface of this why.

Operator Assumptions

When working with the Percona Operator, there are few things to keep in mind:

  • Each deployment has to be seen as a single MySQL service as if a single MySQL instance
  • The technology used to provide the service may change in time …
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Streaming MySQL Backups with Percona XtraBackup – Another Alternative

Today we are going to present you with another way to make a database copy between servers using our Percona XtraBackup utility.  What is the difference with many others existing on the web?  Not many, but they are interesting in terms of performance and availability.

We will combine the xbstream utility with the power of pigz and socat, to take advantage of the multi-processing in the case of having multiple processors, and at the same time, reduce the use of network bandwidth in cases where this component is a bottleneck.  So let’s explain each component:

socat: This stands for SOcket CAT. It is a utility for data transfer between two addresses.

What makes socat so versatile is the fact that an address can represent a network socket, any file descriptor, a Unix domain datagram or stream …

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Percona XtraBackup: Introducing Support For Storage Class in xbcloud

A lot of elements take part in a good backup strategy. Two of them are:

  • Where to store your backups – Never on the same server. Preferable not in the same datacenter. Ideally far enough so you can restore in case of a natural disaster (region flood, extended local power outage, etc…).
  • Retention period – The longer, the better.

Those points relate directly to costs. Storing a backup on an off-site facility cost money. Keeping the backups available to fulfill your retention period policy costs money.

The main cloud providers have different layers of storage often called Storage Class. Each layer has its own particularities and policies, but they come with an important factor – Cost!

We are happy to announce that starting at …

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Redesign of –lock-ddl-per-table in Percona XtraBackup

MySQL 5.7, alongside other many improvements, brought bulk load for creating an index (WL#7277 to be specific), which made ADD INDEX operations much faster by disabling redo logging and making the changes directly to tablespace files. This change requires extra care for backup tools. To block DDL statements on an instance, Percona Server for MySQL implemented LOCK TABLES FOR BACKUP. Percona XtraBackup (PXB) uses this lock for the duration of the backup. This lock does not affect DML statements.

MySQL 5.7 doesn’t have an option to block an instance against DDL and to allow all MDL’s. Thus, Percona XtraBackup has also implemented –lock-ddl-per-table. Before we go into other details, let’s understand how –lock-ddl-per-table works up to now:

  1. PXB …
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Not Ready to Give Up MySQL 5.6? Get Post EOL Support from Percona!

As you may know, MySQL 5.6 will reach EOL (“End of Life”) in February 2021. This means in about two months, there will be no more updates, and more importantly, no more security fixes for discovered vulnerabilities.     

You may be well ahead of the curve and have already updated to MySQL 5.7 or MySQL 8.0, or even better, migrated to Percona Server for MySQL, or maybe not. Perhaps it takes more time than anticipated to adjust your application to be compatible with MySQL 5.7 or higher, or maybe you planned to decommission your application, but life got in the way. Now the EOL date is looming, and there is just no way to decommission your last MySQL 5.6 instance in time.

We have great news for our MySQL Luddites! Percona is pleased to …

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Enabling jemalloc on Percona Server for MySQL 5.7 and 8.0 Series

The benefits of jemalloc versus glibc memory allocator for use with MySQL have been widely discussed. With jemalloc (along with Transparent Huge Pages disabled) there is less memory fragmentation, and thus more efficient resource management of the server memory. For MySQL 5.6, installing jemalloc is enough to enable it when starting the MySQL process. However, for MySQL 5.7 and 8.0.X series, you will need to take a few extra steps.

Enabling jemalloc on Percona Server for MySQL

Installing the jemalloc package is simple for Percona. This is because the library is available on the Percona repository, which is available for both apt and yum package management:

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Support for Percona XtraDB Cluster in ProxySQL (Part Two)

How scheduler and script stand in supporting failover (Percona and Marco example) 

In part one of this series,  I had illustrated how simple scenarios may fail or have problems when using Galera native support inside ProxySQL. In this post, I will repeat the same tests but using the scheduler option and the external script.

The Scheduler

First a brief explanation about the scheduler.

The scheduler inside ProxySQL was created to allow administrators to extend ProxySQL capabilities. The scheduler gives the option to add any kind of script or application and run it at the specified interval of time. The scheduler was also the initial first way we had to deal with Galera/Percona XtraDB Cluster (PXC) node management in case of issues. 

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Support for Percona XtraDB Cluster in ProxySQL (Part One)

How native ProxySQL stands in failover support (both v2.0.15 and v2.1.0)

In recent times I have been designing several solutions focused on High Availability and Disaster Recovery. Some of them using Percona Server for MySQL with group replication, some using Percona XtraDB Cluster (PXC). What many of them had in common was the use of ProxySQL for the connection layer. This is because I consider the use of a layer 7 Proxy preferable, given the possible advantages provided in ReadWrite split and SQL filtering. 

The other positive aspect provided by ProxySQL, at least for Group Replication, is the native support which allows us to have a very quick resolution of possible node failures.

ProxySQL has Galera …

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Recover Percona XtraDB Cluster in Kubernetes From Wrong MySQL Config

Kubernetes operators are meant to simplify the deployment and management of applications. Our Percona Kubernetes Operator for Percona XtraDB Cluster serves the purpose, but also provides users the flexibility to fine-tune their MySQL and proxy services configuration.

The document Changing MySQL Options describes how to provide custom

my.cnf

configuration to the operator. But what would happen if you made a mistake and specified the wrong parameter in the configuration?

Apply Configuration

I already deployed my Percona XtraDB Cluster and deliberately submitted the wrong

my.cnf

  configuration in

cr.yaml

 :

spec:
...
  pxc:
    configuration: …
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Wondering How to Run Percona XtraDB Cluster on Kubernetes? Try Our Operator!

Kubernetes has been a big trend for a while now, particularly well-suited for microservices. Running your main databases on Kubernetes is probably NOT what you are looking for. However, there’s a niche market for them. My colleague Stephen Thorn did a great job explaining this in The Criticality of a Kubernetes Operator for Databases. If you are considering running your database on Kubernetes, have a look at it first. And, if after reading it you start wondering how the Operator works, Stephen also wrote an Introduction to Percona Kubernetes Operator for Percona XtraDB Cluster (PXC), which presents the Kubernetes architecture and how the Percona Operator simplifies the deployment of a …

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