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Showing entries 1 to 10 of 10

Displaying posts with tag: master-master (reset)

How to convert master-slave to master-master replication in MySQL
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Recently, I have worked on one of this case where customer wanted to convert master-slave to master-master replication. They wanted to write on one master and keep another master as a hotspare. Many people are using this kind of environment Continue reading →   [Read more...]
Building a Geo-Distributed CMS-backed site on a Budget (Poor Man’s CDN)
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Many CMS-backed sites are built using MySQL and are launched on cloud infrastructure. In order to mitigate down-time due to regional outages, it is advisable to create a geo-distributed redundancy topology in both the app layer as well as within the database. GenieDB makes it very easy to set up multiple MySQL database servers around the world that are automatically kept synchronized as data is changed on any of the nodes. The database nodes are typically paired 1-on-1 with an app or web server. Some of our customers use the app servers to dish out their CMS backed sites. The database is kept synchronized, but the customers still need to find a way to keep the media content that they use to be available on all these app/web servers. Below is a simple setup that can be easily configured within a very small budget and provides high availability

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Third party solutions for master-master replication in MySQL
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Two of the more popular solutions are  MySQL Master HA and Percona Replication Manager. MySQL Master HA MHA is based on a set of Perl scripts that monitors for replication and server health. When a failover scenario will happen, it Continue reading →   [Read more...]
Morning Reading: Database Players to Watch
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Catching up on our reading today, we saw a blog post from Chris Stevens, the multi-faceted VP of Engineering at Traxo, technology consultant, and Full Stack developer. In his post, he notes some of the impressive new database technologies he’s seeing lately in tech blogs and on the conference circuit.

Chris says that when it makes sense he advises his clients to look at non-relational datatstores, but for a number of reasons he works with MySQL wherever possible. Many of his clients looking to run globally distributed applications often need to distribute the database across more than one data center (geo-distribution) for fault tolerance and localized performance.

“Globally distributed applications often require localized performance,” he said in his post. “We can do

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Beyond Failover: MySQL Multi-Region Master–Master Replication Considerations and Limitations.
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Standard MySQL is configurable such that a single master server can be clustered with a number of read-only slave servers. To enable this master-slave replication, master’s transaction logs are communicated to the slaves (log shipping). Log shipping is a form of asynchronous replication. Under this configuration, the data on the slave always remains behind the master, a condition referred to as slave lag or replication lag. The extent of the slave lag depends on workload, network bandwidth and network latency. Database reads can be served out of the slaves, assuming the application has been designed to tolerate the slave lag and requisite staleness of data (eventual consistency), which can at times be variable and opaque. MySQL master-slave replication offers the possibility of promoting a slave to become the new master

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Could not find first log file name in binary log index file
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Scenario Master – Master replication

MasterA is a client facing server
MasterB is a warm standby server (read only)

MasterB restarted abruptly and when instances were braught back up MasterA (it’s slave) was showing the following error:

MasterA has the following error in show slave status:
Last_IO_Errno: 1236
Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: ‘Could not find first log file name in binary log index file’


Slave: stop slave;

Master: flush logs
Master: show master status; — take note of the master log file and master log position

Slave: start slave;

Quick Multi MySQL Server Installation with Master-Master Replication on Same Windows Box
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This article is a brief step-by-step tutorial on the subject task which is divided into the following main parts: Installing two MySQL Server Instances Setting up master-slave replication Setting up slave-master replication Let’s begin covering those points… Installing Two MySQL Server Instances on Windows: 1. Install MySQL: Download MySQL Binaries from Install normal MSI […]
Replication slave lag monitoring using heartbeat and windows batch scripts
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“Show Slave Status” command has a last column “Seconds_Behind_Master”, which gives us idea about how much time slave is lagging behind master. It is an important to be considered parameter in monitoring and maintaining replication. This article explains us a way to monitor replication slave lag time. It also includes a sample batch scripts to […]
MySQL Master-Master Replication Manager 1.0 Released
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It’s been a long time since we’ve started this project and it is time to make a checkpoint. So, I’ve decided to release final 1.0 version and make 1.X branch stable while all serious development with deep architectural changes will be done 2.X branch (trunk at this moment).

Changes from previous release:

  • Perl semaphores implementation caused huge memory leaks (mmmd_mod).
  • Now we do not send any commands to hard offline hosts with dead TCP/IP stack to prevent mointoring problems for other hosts.
  • Removed legacy StartSlave method from agent code which caused problems on some Perl versions
  • Added a few fixes to prevent non-exclusive roles
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MMM Release 1.0-pre3
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MySQL Master-Master Replication Manager version 1.0-pre3 has been released today. Changes list is really short now:

  • Major fix in multiple clusters support - now you can use many clusters with one monitoring node (details are in mmmd_mon man page)
  • Man pages for mmmd_mon, mmmd_agent and mmm_control scripts
  • Startup scripts added/fixed for mmmd_mon and mmmd_agent
  • Installation script now requires iproute package to be installed on server.

As always, if you have any questions/suggestions, post them here or in mmm-devel mail list.

Showing entries 1 to 10 of 10

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