Archive for MySQL Replication

| September 29, 2009
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Free MySQL webinar today – High Availability Architectures for Online Applications

Update: You can now download a recording of the webinar and the slides from http://www.mysql.com/news-and-events/on-demand-webinars/display-od-403.html

I’ll be presenting the fourth (and final) session of the MySQL for Online Applications webinar series today (29 September). Today’s High Availability Architectures for Online Applications webinar covers:

  • MySQL Replication
  • MySQL Cluster
  • Distributed Replicated Block Device (DRBD)
  • Other high-availability technologies

Register here.

This session starts at 10:00 am Pacific Time but will be rerun tomorrow at 10:00 am CET (9:00 am UK) with Ivan Zoratti presenting (I’ll be handling questions).

More details for today’s webinar:

Tuesday, September 29, 2009

Join us for the last of our 4 part webinar series exploring the different aspects of using MySQL as the backend database for online applications. With real life experience gained working with MySQL Customers such as Facebook, Alcatel Lucent and Google, this webinar series will give you the information you need to run scalable, highly available online applications.

In this last installment we look at MySQL high availability technologies and architectures. We will explore the uses cases for implementing:

  • MySQL Replication
  • MySQL Cluster
  • Distributed Replicated Block Device (DRBD)
  • Other high-availability technologies

Also, covered will be the fundamentals of how these technologies work and how they can be combined to create a more scalable and highly available database infrastructure. Several case studies will be presented to show how these technologies have been implemented in the real world.

Whether you are already using MySQL for your online application or considering it for a new project then register today to learn how you can make best use of the world’s most popular database for online applications.

WHO:

Andrew Morgan, Senior Product Manager, MySQL

WHAT:

High Availability Architectures for Online Applications web presentation.

WHEN:

Tuesday, September 29, 2009: 10:00 Pacific time (America)

Tue, Sep 29: 07:00 Hawaii time
Tue, Sep 29: 11:00 Mountain time (America)
Tue, Sep 29: 12:00 Central time (America)
Tue, Sep 29: 13:00 Eastern time (America)
Tue, Sep 29: 17:00 UTC
Tue, Sep 29: 18:00 Western European time
Tue, Sep 29: 19:00 Central European time
Tue, Sep 29: 20:00 Eastern European time
High Availability Architectures for Online Applications




Category: MySQL, MySQL Cluster, MySQL Replication | Tags: , , , , ,
| September 1, 2009
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MySQL Cluster: Geographic Replication Deep-Dive

Following requests received during earlier MySQL Cluster webinars, a new (and as always, free) webinar has been scheduled which focuses on MySQL Cluster Replication. The webinar is scheduled for Thursday 10 September and you can register at http://www.mysql.com/news-and-events/web-seminars/display-415.html

I’ll be on-line during the webinar, answering questions.

Details….

MySQL Cluster: Geographic Replication Deep-Dive

Thursday, September 10, 2009

MySQL Cluster has been deployed into some of the most demanding web, telecoms and enterprise / government workloads, supporting 99.999% availability with real time performance and linear write scalability.

Tune into this webinar where you can hear from the Director of MySQL Server Engineering provide a detailed “deep dive” into one of MySQL Cluster’s key capabilities – Geographic Replication.

In this session, you will learn how using Geographic Replication enables your applications to :

  • achieve higher levels of availability within a data center or across a WAN
  • locate data closer to users, providing lower latency access
  • replicate to other MySQL storage engines for complex data analysis and reporting of real time data
  • how to get started with Geographic Replication

WHO:

  • Tomas Ulin, Director, MySQL Server Technologies
  • Matthew Keep, MySQL Cluster Product Management

WHAT:

MySQL Cluster: Geographic Replication Deep-Dive web presentation.

WHEN:

Thursday, September 10, 2009: 09:30 Pacific time (America)

Thu, Sep 10: 06:30 Hawaii time
Thu, Sep 10: 10:30 Mountain time (America)
Thu, Sep 10: 11:30 Central time (America)
Thu, Sep 10: 12:30 Eastern time (America)
Thu, Sep 10: 16:30 UTC
Thu, Sep 10: 17:30 Western European time
Thu, Sep 10: 18:30 Central European time
Thu, Sep 10: 19:30 Eastern European time

The presentation will be approximately 45 minutes long followed by Q&A.

WHERE:

Simply access the web seminar from the comfort of your own office.

WHY:

To learn more about how you can use Geographic Replication in MySQL Cluster 7.0 to build real time, high performance applications delivering continuously available database services.





Category: MySQL Cluster, MySQL Replication | Tags: , , ,
| August 13, 2009
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Using NDB API Events to mask/hide colum data when replicating

If you  have asynchronous replication where the slave database is using MySQL Cluster then you can use the NDB API events functionality to mask/overwrite data. You might do this for example if the replica is to be used for generating reports where some of the data is sensitive and not relevant to those reports. Unlike stored procedures, NDB API events will be triggered on the slave.

The first step is to set up replication (master->slave rather than multi-master) as described in Setting up MySQL Asynchronous Replication for High Availability).

In this example, the following table definition is used:

mysql> use clusterdb;
mysql> create table ASSETS (CODE int not null primary key, VALUE int) engine=ndb;

The following code should be compiled and then executed on a node within the slave Cluster:

#include <NdbApi.hpp>
#include <stdio.h>
#include <iostream>
#include <unistd.h>
#include <cstdlib>
#include <string.h>

#define APIERROR(error) 
  { std::cout << "Error in " << __FILE__ << ", line:" << __LINE__ << ", code:" 
  << error.code << ", msg: " << error.message << "." << std::endl; 
  exit(-1); }

int myCreateEvent(Ndb* myNdb,
const char *eventName,
const char *eventTableName,
const char **eventColumnName,
const int noEventColumnName);

static void do_blank(Ndb*, int);

int main(int argc, char** argv)
{
  if (argc < 1)
 {
    std::cout << "Arguments are <connect_string cluster>.n";
    exit(-1);
  }
  const char *connectstring = argv[1];

  ndb_init();

  Ndb_cluster_connection *cluster_connection=
  new Ndb_cluster_connection(connectstring); // Object representing the cluster

  int r= cluster_connection->connect(5 /* retries               */,
  3 /* delay between retries */,
  1 /* verbose               */);
  if (r > 0)
  {
    std::cout << "Cluster connect failed, possibly resolved with more retries.n";
    exit(-1);
  }
  else if (r < 0)
  {
    std::cout << "Cluster connect failed.n";
    exit(-1);
  }

  if (cluster_connection->wait_until_ready(30,30))
  {
    std::cout << "Cluster was not ready within 30 secs." << std::endl;
    exit(-1);
  }

  Ndb* myNdb= new Ndb(cluster_connection,
                      "clusterdb");  // Object representing the database

  if (myNdb->init() == -1) APIERROR(myNdb->getNdbError());

  const char *eventName= "CHNG_IN_ASSETS";
  const char *eventTableName= "ASSETS";
  const int noEventColumnName= 2;
  const char *eventColumnName[noEventColumnName]=
  {"CODE",
   "VALUE"};

  // Create events
  myCreateEvent(myNdb,
  eventName,
  eventTableName,
  eventColumnName,
  noEventColumnName);

  // Normal values and blobs are unfortunately handled differently..
  typedef union { NdbRecAttr* ra; NdbBlob* bh; } RA_BH;

  int i;

  // Start "transaction" for handling events
  NdbEventOperation* op;
  printf("create EventOperationn");
  if ((op = myNdb->createEventOperation(eventName)) == NULL)
    APIERROR(myNdb->getNdbError());

  printf("get valuesn");
  RA_BH recAttr[noEventColumnName];
  RA_BH recAttrPre[noEventColumnName];

  for (i = 0; i < noEventColumnName; i++) {
    recAttr[i].ra    = op->getValue(eventColumnName[i]);
    recAttrPre[i].ra = op->getPreValue(eventColumnName[i]);
  }

  // set up the callbacks
  // This starts changes to "start flowing"
  if (op->execute())
    APIERROR(op->getNdbError());

  while (true) {
    int r = myNdb->pollEvents(1000); // wait for event or 1000 ms
    if (r > 0) {
      while ((op= myNdb->nextEvent())) {
        NdbRecAttr* ra = recAttr[0].ra;
        if (ra->isNULL() >= 0) { // we have a value
          if (ra->isNULL() == 0) { // we have a non-null value
            printf("CODE: %d ", ra->u_32_value());
            do_blank(myNdb, ra->u_32_value());
          } else 
            printf("%-5s", "NULL");
          } else
            printf("%-5s", "-"); // no value
            ra = recAttr[1].ra;
            printf("n");
          }
        }
      }
    }

int myCreateEvent(Ndb* myNdb,
                  const char *eventName,
                  const char *eventTableName,
                  const char **eventColumnNames,
                  const int noEventColumnNames)
{
  NdbDictionary::Dictionary *myDict= myNdb->getDictionary();
  if (!myDict) APIERROR(myNdb->getNdbError());

  const NdbDictionary::Table *table= myDict->getTable(eventTableName);
  if (!table) APIERROR(myDict->getNdbError());

  NdbDictionary::Event myEvent(eventName, *table);
  myEvent.addTableEvent(NdbDictionary::Event::TE_INSERT);

  myEvent.addEventColumns(noEventColumnNames, eventColumnNames);

  // Add event to database
  if (myDict->createEvent(myEvent) == 0)
    myEvent.print();
  else if (myDict->getNdbError().classification ==
            NdbError::SchemaObjectExists) {
    printf("Event creation failed, event existsn");
    printf("dropping Event...n");
    if (myDict->dropEvent(eventName)) APIERROR(myDict->getNdbError());
    // try again
    // Add event to database
    if ( myDict->createEvent(myEvent)) APIERROR(myDict->getNdbError());
  } else
    APIERROR(myDict->getNdbError());

    return 0;
}

static void do_blank(Ndb* myNdb, int code)
{
  const NdbDictionary::Dictionary* myDict= myNdb->getDictionary();
  const NdbDictionary::Table *myTable= myDict->getTable("ASSETS");

  if (myTable == NULL)
  APIERROR(myDict->getNdbError());

  NdbTransaction *myTransaction= myNdb->startTransaction();
  if (myTransaction == NULL) APIERROR(myNdb->getNdbError());

  printf("Replacing VALUE with 0 for CODE: %d ", code);

  NdbOperation *myOperation= myTransaction->getNdbOperation(myTable);
  if (myOperation == NULL) APIERROR(myTransaction->getNdbError());

  myOperation->updateTuple();
  myOperation->equal("CODE", code);
  myOperation->setValue("VALUE", 0);

  if (myTransaction->execute( NdbTransaction::Commit ) == -1)
    APIERROR(myTransaction->getNdbError());

  myNdb->closeTransaction(myTransaction);
}

shell> slave_filter 127.0.0.1:1186

From the master Cluster, insert some values (note that the example can easily be extended to cover updates too):

mysql> insert into ASSETS values (101, 50),(102, 40), (103, 99);

and then check that on the slave the value has been set to 0 for each of the entries:

mysql> select * from ASSETS;
+------+-------+
| CODE | VALUE |
+------+-------+
|  100 |     0 |
|  103 |     0 |
|  101 |     0 |
|  102 |     0 |
+------+-------+

How this works…. The table data is replicated as normal and the real values are stored in the slave. The “slave_filter” process has registered against insert operations on this table and when it’s triggered it sets the VALUE field to 0. The event is processes asynchronously from the replication and so there will be some very narrow window during which the true values would be stored in the slave.





Category: MySQL Cluster, MySQL Replication | Tags: , , ,
| August 3, 2009
13 comments

Setting up MySQL Asynchronous Replication for High Availability

Asynchronous Replication for High Availability

Asynchronous Replication for High Availability

MySQL replication is often positioned as a solution to provide extra throughput for your database (especially when dealing with high numbers of read operations). What tends to be overlooked is how it can be used to provide high availability (HA) – no matter how much redundancy you have at a local level, your system remains at risk from a single catastrophic failure – loss of power, earthquake, terrorist attack etc. By using MySQL asynchronous replication to maintain a geographically remote copy of that data, service can be maintained through any single site failure.

As this replication is asynchronous, there are no low latency demands on the network and so the two sites can be thousands of miles apart while utilising low-cost connections.

This article provides a simple example of how to set up asynchronous replication between 2 MySQL databases in order to provide a Highly Available solution. First of all, it will be 2 databases where the tables will be stored in the MyISAM storage engine and then between 2 MySQL Cluster databases where I also configure it for Multi-master replication where changes can be made at either site.

Subsequent articles will build on this to show:

  • Collision detection and resolution when using MySQL Cluster multi-master asynchronous replication
  • Introducing asynchronous replication to a running MySQL Cluster database

Throughout this article, two machines are used: ws1 (192.168.0.3) and ws2 (192.168.0.4). ws1 will be set up as the master and ws2 as the slave (in the multi-master configuration, both act as both master and slave).

Setting up replication for non-Cluster databases

Replication is performed from one MySQL Server to another; the master makes the changes available and then one or more other Servers pick up those changes and apply them to their own databases. In this example, both databases will store the table data using the same storage engine (MyISAM) but it’s possible to mix and match (for example, take a look at  MySQL Cluster – flexibility of replication). As this is intended as a simple introduction to replication, I’m keeping life simple by assuming that this is all being set up before the database goes into production – if that isn’t the case for you and you need to cope with existing data then check out the MySQL documentation or subsequent articles on this site.

The my.cnf files can be set up as normal but the one for the MySQL Server that will act as the Master needs to have binary-logging enabled. Also, each of the server needs to have a unique server-id. Here are the my.cnf files used for this example:

my.cnf (Master)

[mysqld]
datadir=/home/billy/mysql/myisam/data
basedir=/usr/local/mysql
port=3306
server-id=1
log-bin

my.cnf (Slave)

[mysqld]
datadir=/home/billy/mysql/myisam/data
basedir=/usr/local/mysql
port=3306
server-id=2

Fire up the Master MySQL Server:

[billy@ws1 myisam]$ mysqld --defaults-file=my.cnf&

The slave needs a userid/password in order to access the master server – best practice is to create a dedicated user with just the required privileges:

[billy@ws1 myisam]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> grant replication slave on *.* to 'repl'@'192.168.0.4'
 -> identified by 'repl';
Query OK, 0 rows affected (0.00 sec)

The slave can now be told to start processing the replication data that will be staged by the master server:

[billy@ws2 myisam]$ mysqld --defaults-file=my.cnf&
[billy@ws2 myisam]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.1.34-ndb-7.0.6-cluster-gpl MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> CHANGE MASTER TO
-> MASTER_HOST='192.168.0.3',
-> MASTER_PORT=3306,
-> MASTER_USER='repl',
-> MASTER_PASSWORD='repl',
-> MASTER_LOG_FILE='',
-> MASTER_LOG_POS=4;
090803 15:48:09 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname changed!! Please use '--relay-log=ws2-relay-bin' to avoid this problem.
Query OK, 0 rows affected (0.01 sec)
mysql> start slave;
090803 15:51:24 [Note] Slave SQL thread initialized, starting replication in log 'FIRST' at position 0, relay log './ws2-relay-bin.000001' position: 4
Query OK, 0 rows affected (0.00 sec)
090803 15:51:24 [Note] Slave I/O thread: connected to master 'repl@192.168.0.3:3306',replication started in log 'FIRST' at position 4

Now to test that replication is up and running, create a table on the master, add some data and then check that the table and data can be read from the slave:

[billy@ws1 myisam]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> use test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> create table numbers (num1 int, num2 int);
Query OK, 0 rows affected (0.00 sec)

mysql> insert into numbers values (1,10),(2,20),(3,30);
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0
[billy@ws2 myisam]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 5
Server version: 5.1.34-ndb-7.0.6-cluster-gpl MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from numbers;
+------+------+
| num1 | num2 |
+------+------+
|    1 |   10 |
|    2 |   20 |
|    3 |   30 |
+------+------+
3 rows in set (0.00 sec)

Multi-Master Replication with MySQL Cluster

Multi-Master Replication for HA with MySQL Cluster

Multi-Master Replication for HA with MySQL Cluster

There are a few asynchronous replication capabilities that are unique to MySQL Cluster – one of those is that changes are replicated even if they are made directly to the data nodes using the NDB API, another is that replication can be performed in both directions i.e. multi-master. One of the advantages of this is you can share both read and write operations across both sites so that no capacity is wasted – it also gives you the confidence that either site is sane and ready to take over for the other at any point. You should aim to minimise how often the same rows are modified at the same time on both sites – conflict detection/resolution has been implemented but it can only roll-back the rows changes that conflict with other row changes rather than the full transaction.

It’s important to note that in this article, I’m not talking about the synchronous replication that takes place between data nodes within a single MySQL Cluster site (that happens in parallel and is orthogonal to the asynchronous replication to a remote site).

When performing multi-master asynchronous replication between 2 Clusters, 1 (or more) MySQL Servers in each Cluster is nominated as a master and 1 or more as slaves (it can be the same server that takes on both roles and you can have multiple channels set up in case a channel or MySQL Server is lost). Changes made to the data at either site through any of their MySQL Servers (or directly to the data nodes using the NDB API) will be replicated to the other site.

I will focus on setting up the replication, you can refer to Deploying MySQL Cluster over multiple hosts for the steps to configure and run each MySQL Cluster site.

Most of the steps are very similar to those in the first example – the main differences would come when introducing asynchronous replication to  a MySQL Cluster instance that already contains data and is up and running (processing updates) which will be covered in a subsequent article.

Binary logging needs to be enabled on the MySQL Server(s) at each site that will act as a replication master:

my1.cnf (Master)

[mysqld]
ndb-nodeid=4
ndbcluster
datadir=/home/billy/mysql/replication/7_0_6/data
basedir=/home/billy/mysql/replication/7_0_6
port=3306
server-id=1
log-bin

my1.cnf (Slave)

[mysqld]
ndb-nodeid=4
ndbcluster
datadir=/home/billy/mysql/replication/7_0_6/data
basedir=/home/billy/mysql/replication/7_0_6
port=3306
server-id=2
log-bin

The MySQL Cluster nodes (including the MySQL Servers (mysqld) from both sites should be started up as normal.

In this case, the replication users should be set up for both Clusters:


[billy@ws1 7_0_6]$ mysqld --defaults-file=my.cnf&
[billy@ws1 7_0_6]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.

Your MySQL connection id is 2

Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> grant replication slave on *.* to 'repl'@'192.168.0.4'
-> identified by 'repl';

Query OK, 0 rows affected (0.01 sec)

[billy@ws2 7_0_6]$ mysqld --defaults-file=my.cnf&
[billy@ws2 7_0_6]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.

Your MySQL connection id is 3

Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> grant replication slave on *.* to 'repl'@'192.168.0.3'
-> identified by 'repl';

Query OK, 0 rows affected (0.00 sec)

Replication can then be setup and started on each of the MySQL Servers (those acting as slaves for each Cluster):

[billy@ws1 7_0_6]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 3
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> CHANGE MASTER TO
 -> MASTER_HOST='192.168.0.4',
 -> MASTER_PORT=3306,
 -> MASTER_USER='repl',
 -> MASTER_PASSWORD='repl',
 -> MASTER_LOG_FILE='',
 -> MASTER_LOG_POS=4;
090803 17:25:00 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname changed!! Please use '--relay-log=ws1-relay-bin' to avoid this problem.
Query OK, 0 rows affected (0.01 sec)
mysql> start slave;
090803 17:27:20 [Note] Slave SQL thread initialized, starting replication in log 'FIRST' at position 0, relay log './ws1-relay-bin.000001' position: 4
Query OK, 0 rows affected (0.02 sec)
090803 17:27:20 [Note] Slave I/O thread: connected to master 'repl@192.168.0.4:3306',replication started in log 'FIRST' at position 4

[billy@ws2 7_0_6]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 4
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> CHANGE MASTER TO
 -> MASTER_HOST='192.168.0.3',
 -> MASTER_PORT=3306,
 -> MASTER_USER='repl',
 -> MASTER_PASSWORD='repl',
 -> MASTER_LOG_FILE='',
 -> MASTER_LOG_POS=4;
090803 17:25:56 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname changed!! Please use '--relay-log=ws2-relay-bin' to avoid this problem.
Query OK, 0 rows affected (0.01 sec)
mysql> start slave;
090803 17:27:25 [Note] Slave SQL thread initialized, starting replication in log 'FIRST' at position 0, relay log './ws2-relay-bin.000001' position: 4
Query OK, 0 rows affected (0.00 sec)
090803 17:27:25 [Note] Slave I/O thread: connected to master 'repl@192.168.0.3:3306',replication started in log 'FIRST' at position 4

This time, to make sure that replication is working in both directions, I make changes to both Clusters and then check that they appear at the other site:

[billy@ws1 7_0_6]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 8
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> use test;
Database changed
mysql> create table numbers (num1 int, num2 int) engine=ndb;
090803 17:32:10 [Note] NDB Binlog: CREATE TABLE Event: REPL$test/numbers
090803 17:32:10 [Note] NDB Binlog: logging ./test/numbers (UPDATED,USE_WRITE)
Query OK, 0 rows affected (0.62 sec)

mysql> insert into numbers values (1,10),(2,20),(3,30);
Query OK, 3 rows affected (0.04 sec)
Records: 3  Duplicates: 0  Warnings: 0
billy@ws2 7_0_6]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 8
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> use test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from numbers;
+------+------+
| num1 | num2 |
+------+------+
|    2 |   20 |
|    3 |   30 |
|    1 |   10 |
+------+------+
3 rows in set (0.01 sec)

mysql> insert into numbers values (4,40),(5,50),(6,60);
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0
[billy@ws1 7_0_6]$ mysql -u root
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 9
Server version: 5.1.34-ndb-7.0.6-cluster-gpl-log MySQL Cluster Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql> use test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from numbers;
+------+------+
| num1 | num2 |
+------+------+
|    1 |   10 |
|    6 |   60 |
|    3 |   30 |
|    5 |   50 |
|    2 |   20 |
|    4 |   40 |
+------+------+
6 rows in set (0.02 sec)




Category: MySQL Cluster, MySQL Replication |
| May 26, 2009
9 comments

MySQL Cluster – flexibility of replication

One of the better kept secrets about MySQL Cluster appears to be the flexibility available when setting up replication. Rather than being constrained to implementing a single replication scheme, you can mix and match approaches.

Just about every Cluster deployment will use synchronous replication between the data nodes within a node group to implement High Availability (HA) by making sure that at the point a transaction is committed, the new data is stored in at least 2 physical hosts. Given that MySQL Cluster is usually used to store the data in main memory rather than on disk, this is pretty much mandatory (note that the data changes are still written to disk but that’s done asynchronously to avoid slowing down the database).

MySQL Cluster Replication

MySQL Cluster Replication

MySQL asynchronous replication is often used for MySQL Cluster deployments in order to provide Geographic Redundancy. At the same time as the synchronous replication within a Cluster, the changes can be replicated asynchronously to a second Cluster (or to more than one) at a remote location. Asynchronous rather than synchronous replication is used so that the transaction commit is not delayed while waiting for the remote (could be thousands of miles away, connected by a high latency WAN) Cluster to receive, apply and acknowledge the change. A common misconception is that changes being made through the NDB API will not be replicated to the remote site as this replication is handled by a MySQL Server instance – the reality is that the MySQL Replication implementation will pick up the changes even when they’re written directly to the data nodes through the NDB API.

A third use of replication is to store the Cluster’s data in a seperate database – for example to have a read-only, up-to-date copy of the data stored within the MyISAM storage engine so that complex reports can be generated from it. And the best news is that this can be done at the same time as the local HA and remote Geographic Redundancy replication!

Johan’s Blog provides the technical details around configuring replication in order to provide some extra scaling by setting up non-Cluster slave databases that pick up all changes from the Cluster database.





Category: MySQL Cluster, MySQL Replication | Tags: , , , ,
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