HAProxy: Give me some logs on CentOS 6.5!
HAProxy is frequently used as a load-balancer in front of a Galera cluster. While diagnosing an issue with HAProxy configuration, I realized that logging doesn’t work out of the box on CentOS 6.5. Here...
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Q&A: Percona XtraDB Cluster as a MySQL HA solution for OpenStack
Thanks to all who attended my Nov. 12 webinar titled, “Percona XtraDB Cluster as a MySQL HA Solution for OpenStack.” I had several questions which I covered at the end and a few that I didn’t. You can...
View ArticleTesting backup locks during Xtrabackup SST on Percona XtraDB Cluster
Background on Backup Locks I was very excited to see Backup locks support in release notes for the latest Percona XtraDB Cluster 5.6.21 release. For those who are not aware, backup locks offer an...
View ArticleDiagnosing SST errors with Percona XtraDB Cluster for MySQL
State Snapshot Transfer (SST) is used in Percona XtraDB Cluster (PXC) when a new node joins the cluster or to resync a failed node if Incremental State Transfer (IST) is no longer available. SST is...
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Q&A: Multi-threaded Replication in MySQL 5.6 and MySQL 5.7
My webinar “Multi-threaded Replication in MySQL 5.6 and 5.7” on February 25 generated several excellent questions following the presentation (available here for playback along with the slides). I...
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Test your knowledge: Percona XtraDB Cluster (PXC) quiz
I often talk with people who are very interested in the features of Percona XtraDB Cluster (PXC) such as synchronous and parallel replication, multi-node writing and high availability. However some get...
View ArticleIs 80% of RAM how you should tune your innodb_buffer_pool_size?
It seems these days if anyone knows anything about tuning InnoDB, it’s that you MUST tune your innodb_buffer_pool_size to 80% of your physical memory. This is such prolific tuning advice, it seems...
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Optimizing Percona XtraDB Cluster for write hotspots
Some applications have a heavy write workload on a few records – for instance when incrementing a global counter: this is called a write hotspot. Because you cannot update the same row simultaneously...
View ArticleBypassing SST in Percona XtraDB Cluster with incremental backups
Beware the SST In Percona XtraDB Cluster (PXC) I often run across users who are fearful of SSTs on their clusters. I’ve always maintained that if you can’t cope with a SST, PXC may not be right for...
View ArticleBypassing SST in Percona XtraDB Cluster with binary logs
In my previous post, I used incremental backups in Percona XtraBackup as a method for rebuilding a Percona XtraDB Cluster (PXC) node without triggering an actual SST. Practically this reproduces the...
View ArticleOptimizing PXC Xtrabackup State Snapshot Transfer
State Snapshot Transfer (SST) at a glance PXC uses a protocol called State Snapshot Transfer to provision a node joining an existing cluster with all the data it needs to synchronize. This is...
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How Big Can Your Galera Transactions Be
While we should be aiming for small and fast transactions with Galera, it is always possible at some point you might want a single large transaction, but what is involved? First, this is supposed to be...
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MySQL High Availability: The Road Ahead for Percona and XtraDB Cluster
This blog post discusses what is going on in the MySQL high availability market, and what Percona’s plans are for helping customers with high availability solutions. One thing I like to tell people is...
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Galera Error Failed to Report Last Committed (Interrupted System Call)
In this blog, we’ll discuss the ramifications of the Galera Error Failed to Report Last Committed (Interrupted System Call). I have recently seen this error with Percona XtraDB Cluster (or Galera):...
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Galera warning “last inactive check”
In this post, we’ll discuss the Galera warning “last inactive check” and what it means. Problem I’ve been working with Percona XtraDB Cluster quite a bit recently, and have been investigating various...
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Quest for Better Replication in MySQL: Galera vs. Group Replication
UPDATE: Some of the language in the original post was considered overly-critical of Oracle by some community members. This was not my intent, and I’ve modified the language to be less so. I’ve also...
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Percona XtraDB Cluster 5.7.17-29.20 is now available
Percona announces the release of Percona XtraDB Cluster 5.7.17-29.20 on April 19, 2017. Binaries are available from the downloads section or our software repositories. NOTE: You can also run Docker...
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Performance improvements in Percona XtraDB Cluster 5.7.17-29.20
In our latest release of Percona XtraDB Cluster, we’ve introduced major performance improvements to the MySQLwrite-set replication layer. In this post, we want to show what these improvements look...
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Percona XtraDB Cluster 5.7.24-31.33 Is Now Available
Percona is glad to announce the release of Percona XtraDB Cluster 5.7.24-31.33 (PXC) on January 4, 2019. Binaries are available from the downloads section or from our software repositories. Percona...
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Percona XtraDB Cluster 5.6.42-28.30 Is Now Available
Percona announces the release of Percona XtraDB Cluster 5.6.42-28.30 (PXC) on January 4, 2019. Binaries are available from the downloads section or our software repositories. Percona XtraDB Cluster...
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