Questions tagged [galera]

MariaDB Galera Cluster is a synchronous multi-master cluster.

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ERROR 1047 (08S01): WSREP has not yet prepared node for application use

I have 3 node MySQL Galera cluster in Production, Today when we hit large DDoS on our network cause some issue and assuming some kind of network separation caused following issue on node-1 ERROR 1047 (...
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MariaDB Galera cluster node won't start

I have configured a MariaDB Galera cluster with three nodes. The master node and one slave-master node is up and running, but the third node just won't run. The system specs and cluster config are the ...
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8k views

what is the right way to restart a mariadb galera cluster?

I am trying to restart cluster. I have two problems in stopping cluster and starting cluster In stopping cluster, I follow the instruction https://software.mirantis.com/reference-documentation-on-...
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Help setting up Galera Arbitrator

I am testing a MariaDB Galera Cluster set up with only 2 nodes, I have three servers haproxy, node1 and node2 . I was able to set it up and it worked fine until testing phase. There are two types of ...
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2k views

Connecting client application to MariaDB Galera cluster

I currently have a REST API written in Flask that connects to a MariaDB server. I'm thinking about replacing the server with a Galera cluster to improve availability and ensure continuity in case one ...
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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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How to restore a Galera Cluster from backup

I have a 5 node cluster, with 3 running as VMs on different hosts, and 2 nodes as physical machines. We had a power failure which took down the cluster, and I was not able to get any node to restart (...
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1k views

Getting duplicate record errors like “Duplicate Entry for key 'PRIMARY', error code 1062” when importing a full backup into slave

We're restoring our slave with a full backup from our master, and getting a bunch of duplicate key errors. Once the slave gets caught up, it does not throw any errors (only when it is behind the ...
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1k views

Galera - single database backup & restore

I have a MariaDB Galera cluster. One of its nodes is dedicated for the backups (pc.weight=0 and the MaxScale SQL proxy doesn't know it exists). I'm using mariabackup --backup --galera-info --target-...
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1answer
501 views

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 ...
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Mysql replication between 3 + 1 nodes

Suppose I have the following configuration for mysql 5.6 replication. Nodes A B C D Nodes A,B,C have wsrep_cluster_address set to respective ip's of nodes A,B and C. Then node D has ...
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galera_new_cluster hangs with galera_recovery

My cluster crashed and i cannot restart the first node with galera_new_cluster. The nodes are distributed geographically in France with medium latency of 12ms. It remains on /usr/bin/galera_recovery ...
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MariaDB 10.2.22 Galera Cluster Using Bad Indexes After Analyze

I'm using Drupal on a MariaDB Galera 10.2.22 3 node cluster and I'm having some problems with one query. I have a table (InnoDB) called field_data_field_department which has a bunch of indexes. If I ...
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341 views

Read after write in Galera

I am facing a issue with 3 node galera cluster where the read doesn't return any records even when the write has been commited. Below are the steps which can happen from multiple servers. 1>Server A ...
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1answer
25 views

How to limit impact of a bad application on MariaDB Galera Cluster with MaxScale?

I have a Galera Replication cluster with three MariaDB nodes where a Maxscale Active-Passive cluster in front provides a single node image to tis clients. I have a bad behaving client, which opens ...
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246 views

how wsrep_local_index is defined or could be changed?

I have a cluster of 3 nodes using Galera with MariaDB, every time I want to backup I check the node with the highest wsrep_local_index and then do: SET GLOBAL wsrep_desync = ON; Take the backup, ...
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Galera - why can't I use port 4567 for replication?

I have two Galera clusters in two different datacenters. I want to replicate cluster c1(using c1-1 node as replication master) to cluster c2 (using c2-1 node as replication slave). Everything works ...
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619 views

Mysql And Galera cluster mariaDB , Private and Public IP Addresses multisite

I am just wondering has anyone come accross this before and the best method to go about doing it. We have a customer that wants multi site replication over a galera cluster. I am familiar with ...
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620 views

InnoDB Buffer causing a lot of deadlocks and connection/client timeouts

I have a PXC cluster (5.7) with three nodes running on CentOS 7 VMs, each with the following system info: mysql_db# free total used free shared buff/cache ...
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228 views

Setup replication between two Galera nodes

I've been using MariaDB 10.2 Galera with 3 nodes successfully on local servers. Now, I have a second 3-nodes Galera cluster on another location, joined by an Site-to-Site IPSec Tunnel. I can't really ...
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1answer
2k views

Percona mysql xtradb cluster doesn't start properly and node restarts don't work

tl;dr When starting a fresh percona cluster of 3 kubernetes pods, the grastate.dat seq_no is set at -1 and doesn't change. On deleting one pod and watching it restart, expecting it to rejoin the ...
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Can we use proxysql 2.x for load balancing multiple Galera clusters?

We have recently introduced proxysql 2.x for loadbalancing a galera cluster in production environment. It is working great so far. I have been tasked to separate staging cluster which is currently in ...
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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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492 views

Mariadb Galera cluster empty set

I am playing around with a MariaDB Galera Master Master Cluster and I have some issues which I do not understand. [mysqld] bind-address=0.0.0.0 [galera] wsrep_on=ON wsrep_provider=/usr/lib64/galera/...
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526 views

can't join a freshley started mariadb galera cluster

I'm at my very first clustering experience. I need to create a MariaDB Cluster. Currenlty I have two servers but I planned to add 1 more in the future. Now, I have: maz-pihole (a debian 9 based OS ...
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1answer
32 views

Automatically and robustly restarting a Galera cluster

Galera clusters, somewhat famously, have a requirement that nodes need to be shut down and brought back up again in a certain order. There are a few questions here and on other sites about recovering ...
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Galera cluster node fails with error. Brand new cluster + master / node. Access denied or can't connect

I am having issue. Previous cluster fatally crashed, so I've created a new one with pretty much same settings (changed cluster name only). Here is a galera.cnf for a node: [mysqld] binlog_format=...
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1answer
2k views

Internal MariaDB error code: 1927 ('Connection was killed')

Edit: filed a bug report at https://jira.mariadb.org/browse/MDEV-14493 Mariadb nodes freeze occasionally with the following error in the logs, any clues? (drupal app, db freezes on clearing ...
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2answers
11k views

grastate.dat with seqno -1 on a healthy cluster. Why?

We use those versions: # rpm -qa | egrep '(galera|maria)' mariadb-libs-5.5.41-2.el7_0.x86_64 mariadb-galera-common-5.5.40-6.el7ost.x86_64 mariadb-galera-server-5.5.40-6.el7ost.x86_64 mariadb-5.5.41-2....
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375 views

Inconsistency in Tables - Mariadb Galera Cluster

MariaDB cluster Version : mysql Ver 15.1 Distrib 10.0.24-MariaDB, I have a two node + arbitrator cluster which is live and replicating data across nodes. Unfortunately we found some inconsistency in ...
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244 views

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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507 views

Galera cluster replication stalls when using wsrep_provider_options repl.commit_order=2

we are currently testing if moving from mariaDB master/slave replication to a 3-node-galera-cluster is an option for us. General replication in the cluster works fine like expected. Load test shows ...
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387 views

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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1answer
1k views

Understanding Galera Status wsrep_local_recv_queue_avg

Does wsrep_local_recv_queue_avg really represent the average size of the wsrep_local_recv_queue? For the MariaDB version below I have problems to understand the status value of it, because the ...
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693 views

Galera Cluster Setup - Primary and Secondary Site Scenario

I'm very new to Galera Cluster and is exploring a potential setup with reasonable resiliency to node failure and network failure. Looking at the very bottom part of this documentation, the Weighted ...
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2k views

Help with Galera Cluster Auto_Increment

We're currently running a Galera cluster of 3 DB nodes. The way we're set up (due to ORM and automagical locking), we only have one of the 3 DB nodes being written to, and the other two provisioned ...
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1answer
741 views

Risks when running a MySQL Galera Cluster in production without binlogs?

First of all: I assume that this is no real good idea. However, this Bug in MariaDB 10.1.xx crashes single cluster nodes. https://jira.mariadb.org/browse/MDEV-9510 One of the workarounds is to ...
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1answer
783 views

MariaDB Galera Cluster - first node won't reconnect after restart… Ever

Firewalls disabled, replication worked fine, IP's accessible.. All config copied from here: https://www.digitalocean.com/community/tutorials/how-to-configure-a-galera-cluster-with-mysql-5-6-on-ubuntu-...
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1answer
316 views

shrink ibdata1 in Galera Cluster

I'm having a Galera cluster (3 nodes, but currently using only one), MariaDB 10.0 Galera. However, my ibdata1 is growing HUGE (although using inno_file_per_table=1). Now i want to "shrink" it by ...
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1answer
267 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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1answer
2k views

mysqld got signal 11

I have MariaDB in Galera cluster of 3 nodes. Periodically, each node in the cluster restarts by sending yourself a signal 11. I scoured the Internet in search of a solution to the problem, but to no ...
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63 views

Galera cluster slightly slower than single database?

I recently set up a MariaDB galera cluster for our production. I used sysbench to benchmark the cluster against the old database which is on a single server. On my PRD Galera Cluster I got the ...
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1answer
498 views

Is it possible to setup MySQL replication through ProxySQL?

We currently have replication working through haproxy so that if a node goes down replication continues with one of the other nodes. We're trying to completely replace haproxy with proxysql. Due to ...
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2answers
6k views

Percona - Unable to start mysql after restart

I just configured a percona xtradb cluster in ubuntu with 2 node. This is what I did. launched 2 new servers. Installed percona cluster on both nodes. Stopped mysql on both nodes. On server1: /...
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21k views

How to recover MariaDB Galera Cluster after full crash?

I crashed all my 3 nodes. After all nodes have been started I noticed that mariadb is dead. An I couldn't run it again. I am using CentOS 7 on all servers I tried to start first node and then others ...
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1answer
2k views

InnoDB: Error: log sequence number is in the future!

Hi I have 2 node cluster where recently went offline not sure why. Node1 started fine and all the traffic is on node 1 but node 2 still down due to below error. I tried set the inodb recovery to 3 and ...
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1answer
114 views

MySql Galera Multi site high availability

We have a datacenter with 3 percona glera nodes We have a store that wants to be in sync with our datacenter(multi master) our store's internet connection is not reliable ( may be down for 30 min), ...
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1answer
673 views

MySQL Galera cluster can't initiate first node

I'm using Ubuntu 16.04 and installed MySQL version 5.7 via apt-get in AWS. After that, I've managed to upgrade the MySQL to Galera Cluster by following the Documentation from the official website ...
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2answers
941 views

MySQL duplicate entry error opon import to new server

I do have a DB on MySQL Galera 5.6.34 with a table that contains an index on ID,date. The table is fully functional and I have used repair and check to verify the table. However, upon backup/restore ...
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1answer
978 views

Innodb not started?

I installed MariaDB_Galera_server10.0 , but when i check the error log i see this: 170118 14:49:09 [Note] InnoDB: 128 rollback segment(s) are active. 170118 14:49:09 [Note] InnoDB: Waiting for purge ...

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