Comments on: Setting Up A MySQL Cluster

By: Chuan

Chuan — Mon, 19 Oct 2009 15:07:45 +0000

Great guild. I do have question regarding to 7.0.7 mysql cluster package. In MySQL cluster, i only install cluster package for 2 data nodes and 1 sql node. Do I have to install separate mysql package for mysql node and additional mysql cluster package? It seems that the mysql package includes mysql packet because I was able to run mysqld with only mysql cluster package. The scienario is: 1 mgmt node (good), 2 data nodes(good), 1 mysql node (no good)…it only recognize data directory from its own machine?

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By: Avijit

Avijit — Tue, 07 Apr 2009 07:38:50 +0000

Management Server IP is 192.168.0.125
Nodes are
192.168.0.218 and 192.168.0.236

I modify the existing my.cnf file in 192.168.0.218
[mysqld]
ndbcluster
ndb-connectstring=192.168.0.125
[mysql_cluster]
ndb-connectstring=192.168.0.125
After that I tried to restart mysql in .218 server. But Mysql can not start
Where as in Management Node it says
ndb_mgm> show
Cluster Configuration
———————
[ndbd(NDB)] 2 node(s)
id=2 @192.168.0.218 (Version: 5.0.77, starting, Nodegroup: 0)
id=3 (not connected, accepting connect from 192.168.0.236)

[ndb_mgmd(MGM)] 1 node(s)
id=1 @192.168.0.125 (Version: 5.0.77)

[mysqld(API)] 2 node(s)
id=4 (not connected, accepting connect from any host)
id=5 (not connected, accepting connect from any host)

Can u please help me on that.
Thanks

By: Retif

Retif — Tue, 09 Dec 2008 20:35:42 +0000

What is the maximum number of nodes that be run on one machine?

By: Artem Russakovskii

Artem Russakovskii — Tue, 21 Oct 2008 07:18:05 +0000

@srivastava
I think you should post your question at a MySQL Cluster forum. I think experts there would be able to provide more help than me, as I haven't played around with the cluster for a while.

By: srivastava sk

srivastava sk — Tue, 21 Oct 2008 07:12:17 +0000

We have a sample NDB Cluster setup having all the nodes running on one machine ndbmgm=1,mysqld=1 ,data node=2
group=1,replication=2).Total sample data size is around 4 GB. NDBD configuration parameters – DataMemory=15GB & IndexMemory =5GB
(H/W T2000 Solaris server 32 CPU Strands (8 cores)32 GB RAM.Now the issue is even in case of idle system with clean shutdown of a node it takes around 70 minutes for startup in both ways ( ./bin/ndbd or ./bin/ndbd –initial).Please comment on this. Even query performnce is also very low in comparission to innodb.

By: William Gardner

William Gardner — Mon, 20 Oct 2008 11:57:59 +0000

Awesome post – really useful thanks – bookmarked,

By: Amit Verma

Amit Verma — Mon, 13 Oct 2008 06:51:33 +0000

If you want to LEARN more, please visit URL -

http://www.howtoforge.com/loadbalanced_mysql_cluster_debian

By: geetha

geetha — Wed, 20 Aug 2008 06:50:05 +0000

great article… I followed up this one.. working successfully…

thanks Artem Russakovskii

regards
sg..

By: geetha

geetha — Tue, 19 Aug 2008 11:11:33 +0000

Hi all,

I want to set it up on 2 nodes only..

I want the management stuff,the db engine and the storage engine on one node and the db engine and the storage engine on the second node.

Is it possible? Please help

Thanks
Geetha

By: Artem Russakovskii

Artem Russakovskii — Tue, 05 Aug 2008 14:32:40 +0000

Phil, thank you.

As far as the setup, by all means, in production one should split data and sql nodes. When doing my setup, I only had 4 machines available, so I decided to double load them. I guess I should have made that more obvious in the article.

By: Phil

Phil — Tue, 05 Aug 2008 13:52:32 +0000

This is a great article on MySQL Cluster – much more informative than many other similar articles I've read on other sites.

I am curious however why you would setup (from your screenshot) 4 nodes that are running both ndbd and mysqld.

In tests I've found that performance is much better running mysqld on separate machines from ndbd. It's also recommended that you do not run mysqld on the same servers as ndbd in production environments. It is evident from testing with a 2 x 2 setup that mysqld puts more load on the servers than ndbd does. Did you try running 2 mysqld and 2 ndbd servers before deciding to run 4 combined servers instead?

By: Scott

Scott — Tue, 22 Jul 2008 23:38:15 +0000

For us noobs, make sure you remove any spaces in the config.ini, my data nodes would not connect until I removed them..

The next article I want to see is how to connect to the mysql nodes using mysql-proxy =)…

Thanks for the great post and time you put into this!!

By: Artem Russakovskii

Artem Russakovskii — Tue, 22 Jul 2008 14:29:53 +0000

John, you bring up an excellent point. Apparently since the release of 5.1.25, cluster is packaged separately. I need to do some reading and research first and then update the tutorial with the latest info.

Here are some quick links for now: http://blogs.mysql.com/kaj/2008/05/23/mysql-clusters-improved-release-model/, http://johanandersson.blogspot.com/2008/05/mysql-cluster-62-officially-released.html, http://blogs.sun.com/theaquarium/entry/improved_release_model_for_mysql.

By: John

John — Mon, 21 Jul 2008 14:13:37 +0000

I have questions about your cluster:
1) Is "mysql-server" programe no need to install in SQL nodes or NDB nodes or just install "mysql-cluster" programe?
2) I have downloaded "mysql-cluster-gpl-6.2.15-linux-i686-glibc23.tar.gz", I want to know that the file is same as "mysql-5.1.22-rc-linux-i686-icc-glibc23.tar.gz" you mentioned?

By: <CONTENT /> v.4 » links for 2008-04-15

<CONTENT /> v.4 » links for 2008-04-15 — Tue, 15 Apr 2008 02:32:19 +0000

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By: Artem Russakovskii

Artem Russakovskii — Sat, 05 Apr 2008 21:51:15 +0000

Martin, thank you. It's possible and, in fact, recommended by MySQL. From: http://dev.mysql.com/doc/refman/5.1/en/mysql-cluster-basics.html, "The use of multiple management nodes is also highly recommended."

You can find out how in Chapter 2 of http://www.amazon.com/dp/0672328550/?tag=beepla-20:
"To use multiple management nodes, first of all, you need to create a config.ini file, which must be the same (completely identical) for all management nodes (there is no checking done on this, but if the files are not identical, you will get a giant mess and a cluster crash). When using multiple management nodes, you have to assign all the IDs for the nodes manually in the configuration file. You cannot rely on auto-assignment due to the fact that you can have multiple management nodes assigning the IDs.

You then need to decide which of your management nodes is going to be primary."
The book offers details and sample configurations, so I highly suggest buying it.

By: MBahrami

MBahrami — Fri, 04 Apr 2008 16:13:43 +0000

Good summary; If you're considering NDB, consider how schema changes will be implemented (still need to take cluster to single-user mode?); consider DataMemory size limitations and how use of UTF-8 affects (converting a db with long rows caused us problems); test response time for multi-table joins.

By: Martin Grasso

Martin Grasso — Fri, 04 Apr 2008 14:29:34 +0000

Thanks for the article, is excelent!
Is possible to have a high available Management node?

thanks in advance

By: Artem Russakovskii

Artem Russakovskii — Wed, 26 Mar 2008 18:05:41 +0000

Harrison, you're welcome. It's a great book indeed! Honored to have you post here.