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Faster Cluster Restarts in 3.19 with Gcache Recovery

Galera 3.19 comes with improvements to better handle the situation where the entire cluster needs to be restarted. In previous blog post, we already discussed one such feature: Safe-to-Bootstrap.

In this post, we will discuss gcache recovery, which allows for the cluster to be restarted quickly after it was shut down, thus reducing the overall duration of planned or unplanned downtime.

The Gcache and Whole-Cluster Restarts

In previous versions of Galera, When a node starts up, its Gcache is wiped clean. This means that this node can not serve as an IST donor to other nodes that are also starting up at the same time. This is especially important when the entire cluster is being restarted. When the second node starts, it hopes to quickly rejoin the cluster via IST from the first node:

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Introducing the “Safe-To-Bootstrap” feature in Galera Cluster

Galera Clusters are generally meant to run non-stop, so shutting down the entire cluster is not required during normal operation. Yet, if there is a need to perform such a procedure, it is likely that it will be happening under pressure, so it is important for it to complete safely and as quickly as possible in order to avoid extended downtime and potential data loss.

Galera 3.19 includes two important improvements to whole-cluster restart: the “Safe-to-Bootstrap” protection and Gcache recovery. In this article, we will describe the first feature.

Whole-Cluster Restart

First, a few words on cluster restarts in general. Regardless of whether it was an orderly shutdown or a sudden crash of all nodes, restarting the entire cluster is governed by the following principles:

  • Since the old cluster no longer logically exists, a new logical cluster is being created
  • The first node that is being started …
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Announcing Galera Cluster 5.5.53 and 5.6.34 with Galera 3.19 with improvements to cluster restart

Codership is pleased to announce a new release of Galera Cluster for MySQL consisting of MySQL-wsrep 5.6.34 and Galera 3.19, wsrep API version 25.

This release includes enhancements to make cluster restarts faster and safer, which we will be blogging about over the coming days. It also incorporates all changes up to MySQL 5.6.34, including security fixes.

This and future releases will be available from http://www.galeracluster.com.
The source repositories and bug tracking are now on http://www.github.com/codership.

New features and notable fixes in the Galera replication library since last binary release by Codership (3.18):

  • A new wsrep provider option, gcache.recover, enables gcache to be recovered at restart. This allows the restarted node to serve IST to any other nodes that …
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Meet Codership at MariaDB Developers Meet Up 6-8.10 Amsterdam and OpenStack Summit Barcelona 24-27.10

Come and meet Codership’s Galera Cluster experts at OpenStack Summit Barcelona 24-27.10. Learn more about our plans and latest Galera Cluster for MySQL 5.7 release.  Our booth is A 18.  If you want to set up a meeting with us, please email to info@galeracluster.com .

 

Codership’s CEO Seppo Jaakola will give Galera Cluster for MySQL 5.7 presentation today, 5th of October, at the Percona Live at 2:40pm to 3:05pm. He will also be available for discussions at the MariaDB Developers Meet Up Amsterdam 6-8.10.

Announcing Galera Cluster 5.7 Beta

Codership is pleased to announce a new beta release of Galera Cluster for MySQL 5.7, consisting of MySQL-wsrep 5.7.15 and Galera 3.18.

Galera Cluster for MySQL 5.7 contains enhancements in multiple key areas, including security, performance and monitoring.

This is a beta-quality release and should not be used in production, however we encourage you to give it a try and we welcome all feedback. You can use the bug tracker at https://github.com/codership/mysql-wsrep/issues to submit issues or you can email us at info@galeracluster.com.

This release incorporates all changes up to MySQL 5.7.15 and is available as targeted packages and package repositories for Ubuntu 16.06 and CentOS 7 that can be downloaded from http://www.galeracluster.com. …

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Codership is hiring Software Packaging Engineer!

Software Packaging EngineerJob Description & Main Responsibilities

 

Codership is looking for a part-time Build and Packaging Engineer. We use Jenkins to build various packages for multiple distros and the engineer will take ownership of the build pipeline and extend it to cover additional platforms and testing scenarios.

There are plenty of interesting problems to tackle on the job, from crafting .spec files with complex dependencies to automatically testing no-downtime rolling upgrades of a distributed system.

Main Responsibilities

  •  take the ownership of and maintain Galera Cluster packages on Linux (.RPM and .DEB) and BSD
  • maintain the automatic package building pipeline and extend it to cover additional platforms and testing scenarios

 

Desired Skills & Requirements

 

  • knowledge of …
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View Galera Cluster Best Practices Webinar Replay Part One!

Codership’s Galera Cluster Best Practices Webinar for MySQL DBAs and DevOps Part One is now available to watch here

Announcing Galera Cluster 5.5.52 and 5.6.33 with Galera 3.18 with fix for CVE-2016-6662

Codership is pleased to announce a new release of Galera Cluster for MySQL consisting of MySQL-wsrep 5.6.33 and Galera 3.18, wsrep API version 25.

This release incorporates all changes up to MySQL 5.5.52 and 5.6.33, including the fix for CVE-2016-6662.

Galera Cluster is now available as targeted packages and package repositories for a number of Linux distributions, including Ubuntu, Debian, Fedora, CentOS, RHEL, OpenSUSE and SLES. Obtaining packages using a package repository removes the
need to download individual files and facilitates the deployment and upgrade of Galera nodes.

This and future releases will be available from http://www.galeracluster.com. The source repositories and bug tracking are now on http://www.github.com/codership.

New features and notable fixes in Galera …

[Read more]
Announcing Galera Cluster 5.5.50 and 5.6.31 with Galera 3.17

Codership is pleased to announce a new release of Galera Cluster for MySQL consisting of MySQL-wsrep 5.5.50 and 5.6.31 and Galera 3.17, wsrep API version 25.

This release incorporates all changes up to MySQL 5.5.50 and 5.6.31.

Galera Cluster is now available as targeted packages and package repositories for a number of Linux distributions, including Ubuntu, Debian, Fedora, CentOS, RHEL, OpenSUSE and SLES. Obtaining packages using a package repository removes the
need to download individual files and facilitates the deployment and upgrade of Galera nodes.

This and future releases will be available from http://www.galeracluster.com. The source repositories and bug tracking are now on http://www.github.com/codership .

New features and notable fixes in Galera replication since last …

[Read more]
Using Galera Replication to Create Geo-distributed Clusters on the WAN webinar video is now available!

We will show the advantages of having a geo-distributed database cluster and how to create one using Galera Cluster for MySQL. We will also discuss the configuration and status variables that are involved and how to deal with typical situations on the WAN such as slow, untrusted or unreliable links, latency and packet loss. We will demonstrate a multi-region cluster on Amazon EC2 and perform some throughput and latency measurements in real-time.

 

CHECK THE VIDEO

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