I want to change my cluster to mariadb innodb galera cluster
and need to know does this replication support in memory tables
bbefore this i have mysql in my cluster but need to use mariadb with innodb search engine
bbut the problem is these in memory table
does this replication end to an error?
allowing in memory table in mariadb galera cluster
Galera is all about HA (High Avility). The Query Cache, MyISAM, and MEMORY-table are not practical for a situation where multiple nodes are expected to stay perfectly in sync.
I do not expect any of those to be implemented in the future.;
Please explain what you want MEMORY for. Maybe we can suggest a workaround.
Related
I have been reading about MySQL scaling and I found out that MySQL supports two type of architectures :
Master - Slave - Since updates from master to slave are asychronous then it is possible to have incosistent reads in case a slave is not updated ( due to latency or any other reason). So this system is highly available but not very consistent.
NDB Clustering - So MySQL can use NDB engine to deploy a cluster like NoSQL databases where sharding is also involved. I have two doubts in this that let's say I have 3 data nodes then how NDB engine performs JOIN queries because some of data can reside on Node 1 while other can be on Node2. Also does NDB cluster supports replication of data node? And if it supports replication then replication will be done to same data node or any other node?
I have two kubernetes cluster and I want to make master-master replication for Mysql database. As I read vitess documentation, that is convenient, but I don't know how to do that?
the data is more than 500G in mysql and maybe need sharding. how can I use vitess as Mysql cluster to have zero down time on database layer?
Vitess does not support master-master replication: https://vitess.io/docs/overview/scalability-philosophy/#no-active-active-replication
If zero downtime is your primary concern, then I recommend looking to Percona Xtradb Cluster or Mysql Group Replication, but these require very reliable network between cluster nodes and can easily cause more issues then solve if used incorrectly.
Can anyone advise me if we choose Percona MyRocks storage engine on the slave and replicating off Galera Cluster running Innodb engine. Would such replication work and if so what are the chances of it breaking on schema changes done on Galera cluster via Pt-schema-change.
InnoDB is the only supported storage engine for Galera/PXC replication.
Re-reading your question, it seems you want to use MyRocks on a slave in a 'traditional' async replication scenario, not as part of a cluster. This should work fine as long as that slave does not participate in the Galera cluster. MyRocks only really works well with ROW format, so no STMT/MIX. Any replicated DDL that might alter the engine will cause the slave table alteration to the target engine.
On Galera Mysql Cluster (either Percona or MariaDB) limitation refers that XA transactions are not supported, cause of cluster nature, which is perfectly understand. My question: (i am not a developer so please show some mercy on me) is there any mechanism that replies an OK if the statement has been committed to majority of nodes - something like MongoDB write concern?
Galera replication is synchronous and when a write query gets back to you, the data is on every node in the cluster. If for any reason a node cannot apply the transaction, it will kill itself to maintain the integrity of data throughout the cluster.
We have some (10-) MySQL server nodes and we want them to be replicated in a way that if one goes down the rest never get affected.
I know MySQL provides Master/Slave (not good for us) and Multi-Master replication.
Does MySQL Multi-Master replication work like a mesh? I mean all nodes can get updated from all other nodes?
Is it true that even in Multi-Master replication (MySQL) each node can only get the data from one master???
So if the native MySQL replication features can not fulfill our requirement, do you know any tool that can do this? Our preference is the built-in MySql replication.
The answer to your problem is simple yet very technical aswell. Traditional MYSQL tools cannot help so you need help of Galera cache from codership. Some features are synchronous replication which MYSQL do not offer, and it works as a cluster if you have a galera MYSQL cluster setup, one goes down rest keeps on going.
I personally use Percona xtradb cluster for this, percona xtradb cluster is patched version of MYSQL and galera embeded together. All servers can take reads and writes.
I have written an article on installing this but cannot post here as stack overflow may consider as link building.
DO some research on Galera, as you use normal MYSQL in a cluster environemnt, FULL HA and HS.
If you need some more info feel free to discuss it with me.
Thanks...
I've been researching this as well. MySQL seems to offer multi-master replication. It's explained here: http://www.onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html
and a more complex example with masters and slaves here: http://capttofu.livejournal.com/1752.html.
There are 3rd party tools as well and the one that seems to come up often is Tungsten: http://code.google.com/p/tungsten-replicator/
And here's an excellent article on multi-master replication with MySQL: http://scale-out-blog.blogspot.com/2012/04/if-you-must-deploy-multi-master.html