MariaDB Galera Cluster is a synchronous multi-master cluster.

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Galera: any drawback of enabling wsrep_log_conflicts and cert.log_conflicts?

We have a HAProxy which balances reads and writes to only one (of three) Galera nodes. If this balancing works fine, the parameters wsrep_log_conflicts and cert.log_conflicts should never log any ...
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Howto defrag a Galera Cluster (5.5.41) with innodb_file_per_table = off? After TRUNCATE a huge table is defrag needed?

First question how to defragment our cluster (see Galera and MariaDB config)? I don't know how Galera replicates the new data files size? Second question, is defrag needed? We truncated a 30 GB table ...
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Howto fix replication failure with Galera - thousands of GRA_*.log files on all nodes

Galera Cluster generates a GRA log files if it fails to apply the writeset on the target node. This files exists in the MySQL data directory I use grareader to extract the SQL statement and get ...
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galera cluster in simple failover mode

Can mariadb-galera cluster be configured without data replication but simply in failover mode? I envision such configuration as one active master server and one backup server, both using the same ...
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1 Node crashed of 3 node mariadb galera cluster

Heading I have three nodes Galera cluster MariaDB, a node in June 4, 2016 suddenly crash, the following is log error Red Hat Enterprise Linux Server release 6.5 Server version: 5.5.39-MariaDB-wsrep-...
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WSREP: Requesting state transfer failed: -11(Resource temporarily unavailable)

We have a 3 node Galera cluster. Only one node has "valid" data (gal-1). The other nodes need to sync from this node. I delete datadir and start MariaDB. 160527 14:28:20 [Note] WSREP: discarding ...
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67 views

Unable to change innodb_log_file_size in MariaDB Galera Cluster 10.0

I have a MariaDB Galera cluster (v. 10.0.19) with 3 nodes. I want to increase the innodb_log_file_size (i.e. the size of the InnoDB redo log files) on one of the nodes to match what it is on the other ...
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pt-duplicate-key-checker - DBD::mysql::db selectall_arrayref failed: MySQL server has gone away

I run pt-duplicate-key-checker a few months ago successfully. Now I receive on the same database (Galera, RHEL7) those errors DBD::mysql::db do failed: MySQL server has gone away On CLI I can do use ...
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79 views

MySQL replication/cluster of multiple databases

I am looking for a suitable MySQL replication technology. I'll try to explain our use case first. We have several applications: 1 public web application multiple customized enterprise web ...
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Restarting Galera MySQL after proper Shutdown

I already have read and followed dozens of documents describing a split brain situation and how to restart the cluster after then. However, I am less in this situation as in the situation of shutting ...
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32 views

Galera Cluster not syncing from a standalone Mysql Server

I had setup a 3 node Galera cluster in production network. And I am replicating the data from a Standalone MySQL Server to one of the galera node(node1) through master slave replication. I can ...
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18 views

How to Ensure of Data MariaDB Galera Cluster's Safety?

MariaDB will send a copy of SST to every server which request for it even without checking whether it is in the gcomm:// list. So I can easily get other people's data by simply install a fresh copy of ...
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160 views

systemctl startup script gives “WSREP: Failed to recover position” - manual startup works

We have a Galera crash. 3 Nodes on RHEL7. I can start one node with this command # sudo -u mysql /usr/libexec/mysqld --wsrep-cluster-address='gcomm://' 160408 13:36:24 [Warning] Could not increase ...
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1answer
44 views

Galera MariaDB not joining with IST

Until now, I have a single MariaDB 10.1 node running as Galera Cluster. So, now I want to join the next one. systemctl start mysql initiates the snapshot state transfer (which takes about 10 hours ...
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1answer
180 views

The right way of starting up a Galera Cluster

I am confused about the bootstrap process of MariaDB Galera Cluster. Let's say we have 3 nodes of a MariaDB Galera Cluster, working and functioning normally on CentOS6/7. However, at some point we ...
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143 views

Galera won`t start

MariaDB 10.1. I have 3 nodes: KVM-1 wsrep_on=ON binlog_format=ROW default_storage_engine=InnoDB innodb_autoinc_lock_mode=2 innodb_locks_unsafe_for_binlog=1 query_cache_size=0 query_cache_type=0 ...
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'/etc/init.d/mysql start ­­wsrep­sst_donor=node1' with systemctl (pass WSREP options)

With classic init.d you can pass startup options. /etc/init.d/mysql start ­­wsrep­sst_donor=node1 How to do the same with RHEL7 and systemd (systemctl start mariadb). We use Red Hat provided ...
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60 views

How to do rolling upgrade MariaDB 10.0 -> 10.1 on ubuntu 14

I'm trying to figure out how to do a rolling upgrade of our galera cluster running on MariaDB on Ubuntu 14.04. In testing, the first node I upgraded started complaining about the timestamp column in ...
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Using Galera-Replication, what's the use in having a GTID associated with your backup?

On the topic of using a backupscripts the documentation for galera-cluster states that: You can use backups of this kind to recover data, but they are insufficient for use in recovering nodes to ...
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23 views

Galera timezones out of sync on 2/3 nodes

With a 3-node Galera cluster we had an issue where 2 of the servers started having the wrong timezone. On all of the servers, SELECT @@session.time_zone; would return SYSTEM, but on 2 of these ...
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77 views

How to verify galera is synced

I have been using mysql master:master replication and was always able to check the status of replication using this command: mysql > show slave status\G I was able to see this in the show slave ...
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26 views

innotop “Command Summary”

We provide DBaaS. This is innotop C output: We have only 8% read workload? The rest is write? I don't understand this is very uncommon workload for DBaaS? Statistics since last restart? What is ...
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47 views

Galera Replication error: log block numbers mismatch

I am attempting to get Galera replication working between two nodes. I am finding these errors in my innobackup.backup.log file: xtrabackup: error: log block numbers mismatch: xtrabackup: ...
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MariaDB Galera cluster write all nodes

I've setup a MariaDB Galera cluster. It replicates OK, and works OK. I want to be able to allow inserts in all the cluster nodes, not only on the first node, and right now, I can't do it. It allow ...
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ERROR WSREP`: gcs/src/gcs.cpp:gcs_open():1379:` Failed to open channel 'test_cluster'

I have three server that I want to Install Galera clustering on them, I followed this link to install and config it. but when I want to start the first server I got this error : root@node107:/home/...
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180 views

MySQL cluster write performance with Galera (MariaDB)

I am currently evaluating the migration from our current database server to a three node cluster. Our current server is a VM running MariaDB 10.1 with asynchronous replication to another server in ...
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at the moment mysqldump (22 minutes exec time, 5 GB Dump), when to use xtrabackup?

We use the Puppet code for deploying MariaDB. Those are the backup options. mysql::backup::mysqldump: Implements mysqldump backups. mysql::backup::mysqlbackup: Implements backups with Oracle MySQL ...
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Galera cluster: change the size of InnoDB Redo log files online?

We have a 3 node Galera cluster. I need to change the mysqld innodb_log_file_size parameter (see Changing the Number or Size of InnoDB Redo Log Files). I do this by stopping all 3 nodes and ...
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How can I avoid this deadlock in MariaDB?

I saw that I got a deadlock in a MariaDB cluster. I have 3 cluster database. What should I do to avoid that? 160211 16:29:02 *** (1) TRANSACTION: TRANSACTION 75AB6B17, ACTIVE 0 sec starting index ...
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Changing IP address from existing Mariadb10.1 Galera Cluster

I have a multimaster cluster with MariaDB Galera working properly, it is set to perform the replica through its WAN interface. This configuration was a result of a previous migration from another ...
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MariaDB/Galera Cluster with 3 nodes - Change ENGINE from MyISAM to InnoDB without crash

We have tables with MyISAM. The are out of sync, the number of records is different on each cluster node > select table_schema, table_name from tables where ENGINE = 'MyISAM' and table_schema != '...
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MariaDB Galera Cluster Replication

Does the replication between an async slave connected to a master withing the cluster affect the performance of the master in the cluster?
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How do I stop, tune and restart a MariaDB Galera cluster?

So I have 4 nodes running on some fast but smallist (ram wise) vps machines. This is very cool but they are using 100% of the memory available. I need to turn off performance schema and possibly lower ...
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1answer
168 views

How to get number of active users with one SQL-Query?

I am running a site similar to craigslist where users can create classifieds and write/reply messages. In order to get an idea of activity I would like to get the amount of active users per month. ...
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1answer
83 views

Duplicate keys error after switching to MySQL Galera

I recently switched from a single MySQL installation to MySQL Galera, running on 3 nodes addressed via HAProxy. Ever since switching I do get randomly "duplicate key" errors reported which ...
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1answer
53 views

Why does Table Definitions Opened differ this much between cluster nodes?

I have a Percona/Galera cluster and see this when i monitor the different cluster nodes. What does this really mean? And is this something erroneous that needs to be taken care of? This is how one of ...
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144 views

What's the best setup for a MySQL multi master replication for a POS in a restaurant?

We're in the process of implementing a point of sale (POS) solution where we have heavily modified an existing open source POS. The original POS was never created with replication/synchronization ...
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mariadb error transaction deadlock

I use galera cluster with 4 nodes, mariadb, we insert nearly 12million data. Insert task was finished. However we have lost 11000 data. I don't know where they go. In error log it writes; 151220 17:...
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Can a Galera cluster be configured to allow reads-only while in a non-primary state?

If a node is unable to obtain a quorum, it goes into a non-primary state, where it will not accept any queries until it rejoins other nodes in primary state. There are config options to either ...
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274 views

Replicate only some tables of MariaDB database

I currently have a ready-made structure cluster with MariaDB Galera with two servers that keeps both updated database. However I now have the need to create a new similar structure but with one ...
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Galera 3 node cluster - force an online state transfer without downtime on existing node

We have 3 node Galera cluster. On node 3 I wish to force a state transfer. We have out of sync issues, because table was MyISAM. Now InnoDB. Howto do that? Delete data files and restart? The cluster ...
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WSREP: failed to report last committed and stop

I have galera cluster and I have 4 nodes. I'm importing some data. however one node gives error. Warning. The warning is; warning WSREP: Failed to report last committed 59102, -q (interrupted system ...
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157 views

mariadb galera cluster stop one node automaticly

I have Mariadb galera cluster. I have 4 nodes. but When one node become slow, it stop itself automaticly. that's the error. What should I do? 151030 17:17:14 [Note] WSREP: view((empty)) 151030 17:17:...
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install Galera but mariadb existing on system

I try to install galera on ubuntu 14.04 system. It has already got mariadb and it's working. How can I install it? my command : sudo apt-get install -y rsync galera-3 mariadb-galera-server it ...
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Mariadb, Galera auto_increment_increment

I have a 3 node Galera cluster configured and as a temporary solution so I can re point a client at a time (for testing) I also have a master-master old style slave from the Galera cluster to the old ...
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Galera Cluster crashes because of “ALTER TABLE” statement?

We use on RHEL7 # rpm -qa | grep maria mariadb-5.5.41-2.el7_0.x86_64 mariadb-galera-common-5.5.41-2.el7ost.x86_64 mariadb-galera-server-5.5.41-2.el7ost.x86_64 Do I analyze logs correct that Galera ...
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1answer
48 views

Using Galera Cluster(Percona XtraDB Cluster, MariaDB Cluster) for setting up multi master

Before i gotta use one I want to know if it is working in windows OS cause I saw a lot using it in linux OS. Does using galera (Percona XtraDB Cluster, MariaDB Cluster) cluster works in windows?
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123 views

How to change the replication State Transfer SST to IST in Galera Config

I would like to migrate 700GB data to galera cluster(2node+1arbitrator). I found that IST is the best method for huge DBs.So how to forecfully change the replication from SST to IST in Galera Config. ...
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How (if at all) does Galera enforce authentication for SST via rsync when adding a node?

I have to be missing something here. It just hit me as added a new node to my cluster in order to prepare for the removal of a different node: "How does the cluster know that it is okay to send the ...