What on Earth is a Split-Brain Scenario in a MySQL Database Cluster?

Author: , June 24th, 2019

In this blog post we will define what a split-brain scenario means in a MySQL database cluster, and then explore how a Tungsten MySQL database cluster reacts to a split-brain situation.

Configuring the Tungsten Connector for PCI Compliance

Author: , June 18th, 2019

This blog is about configuring Tungsten for PCI compliance.

Why is My Java Application Freezing Under Heavy I/O Load?

Author: , June 17th, 2019

Latency-sensitive applications running in Java sometimes experience unacceptable delays under heavy I/O load. This blog discusses why this problem occurs and what to do about it for applications running Tungsten Clustering for MySQL.

Using Keep-Alives To Ensure Long-Running MySQL & MariaDB Sessions Stay Connected

Author: , June 14th, 2019

Overview The Skinny In this blog post we will discuss how to use the Tungsten Connector keep-alive feature to ensure long-running MySQL & MariaDB/Percona Server client sessions stay connected in a Tungsten Cluster. Agenda What’s Here? Briefly explore how the Tungsten Connector works Describe the Connector keep-alives – what are they and why do we […]

How To Install/Update CPAN on MacOS Mojave with fatal error: ‘EXTERN.h’ file not found

Author: , June 12th, 2019

The Problem Tried to install the latest version of cpan and got stuck. Tracked it down to the dependency module Mac::SystemDirectory which was failing to build:

The Solution Use the MacOS installer command to deploy the needed files:

The, rerunning the cpan install works:

How To Solve the LOAD DATA INFILE Error from –secure-file-priv

Author: , June 12th, 2019

The Problem Tried to load a Tab-delimited text file into MuSQL 5.6.43 and got the following error: mysql> LOAD DATA INFILE ‘sample.txt’ INTO TABLE test_table; ERROR 1290 (HY000): The MySQL server is running with the –secure-file-priv option so it cannot execute this statement Solution One mysql> SHOW VARIABLES LIKE “secure_file_priv”; Copy the file into the […]

How To Get Sonos Working on MacOS Mojave

Author: , June 6th, 2019

Sonos was running just fine oon my MacOS Mojave iMac, then I had to force-quit it due to a system freeze. The Sonos app REFUSED to start, no matter what I tried, including uninstall/reinstall, full scrub of all files located, uninstaller software, reboots, cache cleaning and reboot with Onyx – NOTHING worked, and i was […]

The Continuent Docker Support Policy Explained

Author: , June 5th, 2019

Overview Continuent has traditionally had a relaxed policy about Linux platform support for customers using our products. While it is possible to install and run Continuent Tungsten products (i.e. Cluster/Replicator/etc.) inside Docker containers, there are many reasons why this is not a good idea. Background As background, every database node in a Tungsten Cluster runs […]

How To Show Filenames With git log

Author: , June 3rd, 2019

To display the filenames included in each commit, just add the –name-only argument to git log:

How To Remove A File From The git Staging Pre-Commit List

Author: , May 31st, 2019

Quickref: How to Remove a file from the staging area

The Story Recently, I accidentally added some files to git’s pre-commit phase, i.e.:

For example, here is how to handle the above situation:

To better understand, here are the phases/states/stages that git uses: Untracked – when a file is first created, git […]