Deploy HTAP Topology with MariaDB Enterprise Server 10.5

Overview

This procedure describes the deployment of the HTAP topology with MariaDB Enterprise Server 10.5 and MariaDB Enterprise ColumnStore 5.

MariaDB Enterprise ColumnStore 5 is a columnar storage engine for MariaDB Enterprise Server 10.5. This topology is best suited for Hybrid Transactional-Analytical Processing (HTAP) workloads.

This procedure has 4 steps, which are executed in sequence.

This procedure represents the basic product capability and uses 1 Enterprise ColumnStore node.

This page provides an overview of the topology, requirements, and deployment procedures.

Please read and understand this procedure before executing.

Support

Customers can obtain support by submitting a support case.

Components

The following components are deployed during this procedure:

Component

Function

MariaDB Enterprise Server 10.5

Modern SQL RDBMS with high availability, pluggable storage engines, hot online backups, and audit logging.

MariaDB Enterprise Server Components

Component

Description

InnoDB

  • General purpose storage engine

  • Support for Online Transactional Processing (OLTP) workloads

  • ACID-compliant

  • Performance

MariaDB Enterprise ColumnStore 5

  • Columnar storage engine

  • Optimized for Online Analytical Processing (OLAP) workloads

  • Scalable query execution

Topology

Enterprise ColumnStore HTAP Topology with Object Storage

The MariaDB Enterprise ColumnStore HTAP topology is designed for hybrid transactional-analytical processing (HTAP) workloads.

The topology consists of:

  • One MaxScale node

  • One ColumnStore node running ES and Enterprise ColumnStore

The MaxScale node:

  • Monitors the health and availability of the ColumnStore node using the MariaDB Monitor (mariadbmon)

  • Accepts client and application connections

  • Routes queries to the ColumnStore node using the Read/Write Split Router (readwritesplit)

The ColumnStore node:

  • Receives queries from MaxScale

  • Executes queries

  • Uses a row-based storage engine, such as InnoDB to handle transactional queries

  • Uses Enterprise ColumnStore as the columnar storage engine to handle analytical queries

  • Uses cross-engine JOINs to join transactional and analytical tables

  • Replicates data between engines using MariaDB Replication

  • Optionally uses S3-compatible object storage for Enterprise ColumnStore data

Requirements

These requirements are for the HTAP topology when deployed with MariaDB Enterprise Server 10.5 and MariaDB Enterprise ColumnStore 5.

Operating System

In alignment to the enterprise lifecycle, the HTAP topology with MariaDB Enterprise Server 10.5 and MariaDB Enterprise ColumnStore 5 is provided for:

  • CentOS 7 (x86_64)

  • CentOS 8 (x86_64)

  • Debian 9 (x86_64)

  • Debian 10 (x86_64)

  • Red Hat Enterprise Linux 7 (x86_64)

  • Red Hat Enterprise Linux 8 (x86_64)

  • SUSE Linux Enterprise Server 12 (x86_64)

  • SUSE Linux Enterprise Server 15 (x86_64)

  • Ubuntu 18.04 (x86_64)

  • Ubuntu 20.04 (x86_64)

S3-Compatible Object Storage Option

The HTAP topology can use S3-compatible object storage to store ColumnStore data, but it is not required.

Many S3-compatible object storage services exist. MariaDB Corporation cannot make guarantees about all S3-compatible object storage services, because different services provide different functionality.

For the preferred S3-compatible object storage providers that provide cloud and hardware solutions, see the following sections:

The use of non-cloud and non-hardware providers is at your own risk.

If you have any questions about using specific S3-compatible object storage with MariaDB Enterprise Columnstore, contact us.

Preferred Object Storage Providers: Cloud

  • Amazon Web Services (AWS) S3

  • Google Cloud Storage

  • Azure Storage

  • Alibaba Cloud Object Storage Service

Preferred Object Storage Providers: Hardware

  • Cloudian HyperStore

  • Dell EMC

  • Seagate Lyve Rack

  • Quantum ActiveScale

  • IBM Cloud Object Storage

Limitations

Cross-Database Queries

This implementation relies on replicate_rewrite_db, so it does not support cross-database queries with statement-based replication.

For example, if the replicated database is selected by the USE, then the query will replicate properly:

USE innodb_db;

INSERT INTO htap_test1
   VALUES (100);

SELECT * FROM columnstore_db.htap_test1;
+------+
| id   |
+------+
|  100 |
+------+

However, if the replicated database is not selected, and it is instead prefixed the table name in the query, then the query will not replicate properly:

USE columnstore_db;

INSERT INTO innodb_db.htap_test1
   VALUES (200);

SELECT * FROM columnstore_db.htap_test1;
+------+
| id   |
+------+
|  100 |
+------+

Semi-Synchronous Replication

This implementation has not been tested with semi-synchronous replication.

Parallel Replication

This implementation has not been tested with parallel replication.

Row-Based Replication

This implementation requires the binlog_format system variable to be set to STATEMENT. Row-based replication is not currently supported.

Quick Reference

MariaDB Enterprise Server Configuration Management

Method

Description

Configuration File

Configuration files (such as /etc/my.cnf) can be used to set system-variables and options. The server must be restarted to apply changes made to configuration files.

Command-line

The server can be started with command-line options that set system-variables and options.

SQL

Users can set system-variables that support dynamic changes on-the-fly using the SET statement.

MariaDB Enterprise Server packages are configured to read configuration files from different paths, depending on the operating system. Making custom changes to Enterprise Server default configuration files is not recommended because custom changes may be overwritten by other default configuration files that are loaded later.

To ensure that your custom changes will be read last, create a custom configuration file with the z- prefix in one of the include directories.

Distribution

Example Configuration File Path

  • CentOS

  • Red Hat Enterprise Linux (RHEL)

  • SUSE Linux Enterprise Server (SLES)

/etc/my.cnf.d/z-custom-mariadb.cnf

  • Debian

  • Ubuntu

/etc/mysql/mariadb.conf.d/z-custom-mariadb.cnf

MariaDB Enterprise Server Service Management

The systemctl command is used to start and stop the MariaDB Enterprise Server service.

Operation

Command

Start

sudo systemctl start mariadb

Stop

sudo systemctl stop mariadb

Restart

sudo systemctl restart mariadb

Enable during startup

sudo systemctl enable mariadb

Disable during startup

sudo systemctl disable mariadb

Status

sudo systemctl status mariadb

MariaDB Enterprise Server Logs

MariaDB Enterprise Server produces log data that can be helpful in problem diagnosis.

Log filenames and locations may be overridden in the server configuration. The default location of logs is the data directory. The data directory is specified by the datadir system variable.

Log

System Variable/Option

Default Filename

MariaDB Error Log

log_error

<hostname>.err

MariaDB Enterprise Audit Log

server_audit_file_path

server_audit.log

Slow Query Log

slow_query_log_file

<hostname>-slow.log

General Query Log

general_log_file

<hostname>.log

Binary Log

log_bin

<hostname>-bin

Enterprise ColumnStore Service Management

The systemctl command is used to start and stop the ColumnStore service.

Operation

Command

Start

sudo systemctl start mariadb-columnstore

Stop

sudo systemctl stop mariadb-columnstore

Restart

sudo systemctl restart mariadb-columnstore

Enable during startup

sudo systemctl enable mariadb-columnstore

Disable during startup

sudo systemctl disable mariadb-columnstore

Status

sudo systemctl status mariadb-columnstore

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