Showing entries 1 to 10 of 69
10 Older Entries »
Displaying posts with tag: XtraDB Cluster (reset)
Webinar Wednesday, April 18, 2018: Percona XtraDB Cluster 5.7 Tutorial

Please join Percona’s Architect, Tibi Köröcz as he presents Percona XtraDB Cluster 5.7 Tutorial on Wednesday, April 18, 2018, at 7:00 am PDT (UTC-7) / 10:00 am EDT (UTC-4).

Never used Percona XtraDB Cluster before? Come join this 45-minute tutorial where we will introduce you to the concepts of a fully functional Percona XtraDB Cluster.

In this tutorial, we will show you how you can install Percona XtraDB Cluster with ProxySQL, and monitor it with Percona …

[Read more]
This Week in Data with Colin Charles 30: Schedule for Percona Live, and Tracking Those Missing Features

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

Have you registered for Percona Live already? The tutorial grid, the schedules for day 1 and day 2 are pretty amazing, and there is even an extra track being added, for a total of 10 concurrent/parallel tracks during day 1 & day 2. If you submitted a talk and it didn’t get accepted (competition was high), you should have received a discount code to register for the event.

I plan to write more dedicated blog posts around M|18 and the MariaDB Developer’s …

[Read more]
This Week in Data with Colin Charles 25: Meltdown/Spectre still dominate, FOSDEM approaches and Timescale gets funding

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

Still on Meltdown/Spectre, this time MariaDB Corporation has published Meltdown Vulnerability Impact On MariaDB Server – interesting the comparison between glibc/tcmalloc. Worthy Facebook thread about this too, with a bit of chat about MongoDB performance. Officially MongoDB says a degradation of 10-15%. ScaleGrid has a good post, in which they test MongoDB against …

[Read more]
This Week in Data with Colin Charles 17: AWS Re:Invent, a New Book on MySQL Cluster and Another Call Out for Percona Live 2018

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

The CFP for Percona Live Santa Clara 2018 closes December 22, 2017: please consider submitting as soon as possible. We want to make an early announcement of talks, so we’ll definitely do a first pass even before the CFP date closes. Keep in mind the expanded view of what we are after: it’s more than just MySQL and MongoDB. And don’t forget that with one day less, there will be intense competition to fit all the content in.

A new book on MySQL Cluster is out: Pro MySQL NDB Cluster by Jesper Wisborg Krogh and Mikiya Okuno. At 690 pages, it is a weighty tome, and something I fully plan on reading, considering I haven’t played with …

[Read more]
Improved wsrep-stages and related instrumentation in Percona XtraDB Cluster

In this blog post, we’ll look at how we’ve improved wsrep-stages and related instrumentation in Percona XtraDB Cluster.

Introduction

When you execute a workload and need to find out what the given thread is working on, “SHOW PROCESSLIST” comes to the top of your mind. It is an effective way to track the thread status. We decided to improve the stages in Percona XtraDB Cluster to make “SHOW PROCESSLIST” more meaningful.

In the blog below, we will check out the different wsrep-stages and the significance associated with them.

Loading of data

Running a simple insert/sysbench prepare workload. The state is stable as it mainly captures …

[Read more]
Percona XtraDB Cluster Transaction Replay Anomaly

In this blog post, we’ll look at a transaction replay anomaly in Percona XtraDB Cluster.

Introduction

Percona XtraDB Cluster/Galera replays a transaction if the data is non-conflicting but, the transaction happens to have conflicting locks.

Anomaly

Let’s understand this with an example:

  • Let’s assume a two-node cluster (node-1 and node-2)
  • Base table “t” is created as follows:
create database test;
use test;
create table t (i int, c char(20), primary key pk(i)) engine=innodb;
insert into t values (1, 'abc'), (2, 'abc'), (4, 'abc');
select * from t;
mysql> select * from t;
+---+------+
| i | c |
+---+------+
| 1 | abc |
| 2 | abc |
| 4 | abc |
+---+------+
  • node-2 starts runs a transaction (trx-2):
[Read more]
BEWARE: Increasing fc_limit can affect SELECT latency

In this blog post, we’ll look at how increasing the fc_limit can affect SELECT latency.

Introduction

Recent Percona XtraDB Cluster optimizations have exposed fc_limit contention. It was always there, but was never exposed as the Commit Monitor contention was more significant. As it happens with any optimization, once we solve the bigger contention issues, smaller contention issues start popping up. We have seen this pattern in InnoDB, and Percona XtraDB Cluster is no exception. In fact, it is good because it tells us that we are on the right track.

If you haven’t yet checked the performance blogs, then please visit here and …

[Read more]
Simplified Percona XtraDB Cluster SSL Configuration

In this blog post, we’ll look at a feature that recently added to Percona XtraDB Cluster 5.7.16, that makes it easier to configure Percona XtraDB Cluster SSL for all related communications. It uses mode “encrypt=4”, and configures SSL for both IST/Galera communications and SST communications using the same SSL files. “encrypt=4” is a new encryption mode added in Percona XtraDB Cluster 5.7.16 (we’ll cover it in a later blog post).

If this option is used, this will override all other Galera/SST SSL-related file options. This is to ensure that a consistent configuration is applied. Using this option also means that the Galera/SST communications are …

[Read more]
Tracking IST Progress in Percona XtraDB Cluster

In this blog post, we’ll look at how Percona XtraDB Cluster uses IST.

Introduction

Percona XtraDB Cluster uses the concept of an Incremental State Transfer (IST). When a node of the cluster leaves the cluster for a short period of time, it can rejoin the cluster by getting the delta set of missing changes from any active node in the cluster.

This process of getting the delta set of changes is named as IST in Percona XtraDB Cluster.

Tracking IST Progress

The number of write-sets/changes that the joining node needs to catch up on when rejoining the cluster is dictated by:

  1. The duration the node was not present in the cluster
[Read more]
How We Made Percona XtraDB Cluster Scale

In this blog post, we’ll look at the actions and efforts Percona experts took to scale Percona XtraDB Cluster.

Introduction

When we first started analyzing Percona XtraDB Cluster performance, it was pretty bad. We would see contention even with 16 threads. Performance was even worse with sync binlog=1, although the same pattern was observed even with the binary log disabled. The effect was not only limited to OLTP workloads, as even other workloads (like update-key/non-key) were also affected in a wider sense than OLTP.

That’s when we started analyzing the contention issues and found multiple problems. We will discuss all these problems and the solutions we adapted. But …

[Read more]
Showing entries 1 to 10 of 69
10 Older Entries »