Scaling Twitter 12758

Jun 20, 20073 likes779 views

The document discusses how to scale a Rails application to handle increasing traffic. It describes the initial setup with 180 Rails instances, 1 database server, and 30 background processes. It then provides tips for optimizing database queries, caching, using messaging systems like DRb and RabbitMQ, and dealing with abusive behavior. The tips emphasize indexing columns, denormalizing data, caching frequently accessed data, and using messages to invalidate caches when data changes.

FeedBurner is a feed management provider that has scaled to serve 270,000 feeds and 100 million hits per day. The document discusses FeedBurner's scaling history and the solutions they implemented to address various scalability problems, including using load balancers and health checks, caching with Memcached, batch processing, partitioning tables, and implementing a disaster recovery plan using a "Panic App" to download and synchronize feeds.

Java MySQL Connector & Connection Pool Features & OptimizationKenny Gryp

This talk will give an overview of the different available Java MySQL connectors (Connector/J, MariaDB Java Connector) and connection pools (Commons-DBCP, C3P0, ...). One of the things with the default configuration of these solutions is that they are very chatty. This can have a noticeable impact on application performance and database load. I've seen many environments where over 50% of the total amount of queries are caused by such behavior. This behavior will be explained through examples seen on production systems as well as recommendations on optimization will be made. Load balancing and transparent failover solutions will be described for both MySQL's traditional asynchronous replication and Galera based replication (Percona XtraDB Cluster or MariaDB Galera Cluster).

Webinar Slides: Migrating to Galera ClusterSeveralnines

This document discusses considerations for migrating to Galera Cluster replication from MySQL or other database systems. It covers differences in supported features between Galera and MySQL, including storage engines, tables without primary keys, auto-increment handling, and DDL processing. It also addresses multi-master conflicts, long transactions, LOAD DATA processing, and using Galera with MySQL replication. An overview of online migration is provided along with guidance on validating schemas and checking for compatibility prior to migration.

Using advanced options in MariaDB Connector/JMariaDB plc

MariaDB Connector/J is our widely used Type 4 JDBC driver for Java. This session covers the basics of getting started with Java and MariaDB, and moves quickly to more advanced topics, including connection pooling, automatic failover and debugging. Diego Dupin also includes an overview of popular object/relational mapping (ORM) and programming frameworks for Java. Even if you have been using the MariaDB Connector/J for years, come to this session to learn about the latest release, see where the connector is going and discover the latest tips and tricks.

Building better Node.js applications on MariaDBMariaDB plc

In this session, Diego Dupin teaches tips and tricks for using the new Node.js connector for MariaDB. Recent driver updates include exciting new features such as a promise-based API, pipelining and insert streaming. Targeted at beginner to intermediate Node.js developers, this session includes basics for getting started with Node.js before focusing on best practices and more advanced topics. The session finishes with an overview of integration with well-known Node.js frameworks, including the popular objection/relational mapping (ORM) frameworks.

Streaming replication in PostgreSQLAshnikbiz

This document provides instructions for setting up hot standby replication between a primary and secondary PostgreSQL database. It describes configuring WAL archiving on the primary, taking a backup of the primary to initialize the secondary, creating a recovery.conf file on the secondary, and testing replication. It also explains how to trigger a failover, switchover, and rebuild the primary database after a failover.

Spark / Mesos Cluster Optimizationebiznext

Spark and Mesos cluster optimization was discussed. The key points were: 1. Spark concepts like stages, tasks, and partitions were explained to understand application behavior and optimization opportunities around shuffling. 2. Application optimization focused on reducing shuffling through techniques like partitioning, reducing object sizes, and optimizing closures. 3. Memory tuning in Spark involved configuring storage and shuffling fractions to control memory usage between user data and Spark's internal data. 4. When running Spark on Mesos, coarse-grained and fine-grained allocation modes were described along with solutions like using Mesos roles to control resource allocation and dynamic allocation in coarse-grained mode.

DATABASE AUTOMATION with Thousands of database, monitoring and backupSaewoong Lee

MySQL 5.7 innodb_enhance_partii_20160527Saewoong Lee

Release Date : 2016.05.27 Version : MySQL 5.7 Index : - Part I : InnoDB Performance - Part I : InnoDB Buffer Pool Flushing - Part I : InnoDB internal Transaction General - Part I : InnoDB Improved adaptive flushing - Part II : InnoDB Online DDL - Part II : Tablespace management - Part II : InnoDB Bulk Load for Create Index - Part II : InnoDB Temporary Tables - Part II : InnoDB Full-Text CJK Support - Part II : Support Syslog on Linux / Unix OS - Part II : Performance_schema - Part II : Useful tips

Plny12 galera-cluster-best-practicesDimas Prasetyo

Multi Source Replication With MySQL 5.7 @ VerisureKenny Gryp

Verisure migrated their data warehouse from using Tungsten Replicator to native multi-source replication in MySQL 5.7 to simplify operations. They loaded data from production shards into the new data warehouse setup using XtraBackup backups and improved replication capacity with MySQL's parallel replication features. Some issues were encountered with replication lag reporting and crashes during the upgrade but most were resolved. Monitoring and management tools also required updates to support the new multi-source replication configuration.

Galera Cluster: Synchronous Multi-Master Replication for MySQL HALudovico Caldara

This document provides an overview of Galera Cluster, which enables synchronous multi-master replication for MySQL high availability (HA). It discusses how Galera Cluster works, including how nodes are added to the cluster through state transfers, and how it handles failures and split-brain situations. Key features highlighted include its use of InnoDB storage engine, "virtually synchronous" replication approach, and ability to scale writes across multiple nodes. The document also covers performance, migration, and load balancing considerations for Galera Cluster.

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Webinar slides: 9 DevOps Tips for Going in Production with Galera Cluster for...Severalnines

This document provides an overview and agenda for a webinar on managing and monitoring MySQL clusters using ClusterControl by Severalnines. The webinar host is introduced and instructions are provided for asking questions. The webinar will cover topics such as operating system configuration, backup strategies, replication, query performance, schema changes, security, reporting, and disaster recovery. Case studies and customers are also briefly mentioned.

Scaling symfony appsMatteo Moretti

This document discusses scaling Symfony applications. It begins by introducing the speaker and their experience scaling large applications. It then covers scaling different aspects of an application including the web server, sessions, database, and filesystem. For each area, it provides recommendations such as using PHP opcode caching, storing sessions in Redis or Memcached, considering database sharding for very large databases, and using an abstraction layer like FlysystemBundle to store files in cloud storage like Amazon S3. The overall message is that scaling can be achieved through configuration changes and decoupling services rather than code changes.

MySQL Backup and Security Best PracticesLenz Grimmer

MySQL Backup and Security discusses best practices for securing MySQL servers and backing up MySQL data. It provides guidance on improving MySQL security through password protection, access controls and encryption. It also reviews various backup methods like logical backups using mysqldump, physical backups of data files, and techniques like MySQL replication and file system snapshots for backups with reduced downtime.

Intro ProxySQLI Goo Lee

This document provides an overview and instructions for installing and configuring ProxySQL. It discusses: 1. What ProxySQL is and its functions like load balancing and query caching 2. How to install ProxySQL on CentOS and configure the /etc/proxysql.cnf file 3. How to set up the ProxySQL schema to define servers, users, variables and other settings needed for operation 4. How to test ProxySQL functions like server status changes and benchmark performance

Building tungsten-clusters-with-postgre sql-hot-standby-and-streaming-replica...Command Prompt., Inc

Alex Alexander & Linas Virbalas Hot standby and streaming replication will move the needle forward for high availability and scaling for a wide number of applications. Tungsten already supports clustering using warm standby. In this talk we will describe how to build clusters using the new PostgreSQL features and give our report from the trenches. This talk will cover how hot standby and streaming replication work from a user perspective, then dive into a description of how to use them, taking Tungsten as an example. We'll cover the following issues: * Configuration of warm standby and streaming replication * Provisioning new standby instances * Strategies for balancing reads across primary and standby database * Managing failover * Troubleshooting and gotchas Please join us for an enlightening discussion a set of PostgreSQL features that are interesting to a wide range of PostgreSQL users.

Online MySQL Backups with Percona XtraBackupKenny Gryp

Percona XtraBackup is a free, open source, complete online backup solution for all versions of Percona Server, MySQL® and MariaDB®. Percona XtraBackup provides: * Fast and reliable backups * Uninterrupted transaction processing during backups * Savings on disk space and network bandwidth with better compression * Automatic backup verification * Higher uptime due to faster restore time This talk will discuss the various different features of Percona XtraBackup, including: * Full & Incremental Backups * Compression, Streaming & Encryption of Backups * Backing Up To The Cloud (Swift). * Percona XtraDB Cluster / Galera Cluster. * Percona Server Specific features

Operations, Consistency, Failover for Multi-DC Clusters (Alexander Dejanovski...DataStax

This document discusses operations, consistency, and failover for multi-datacenter Apache Cassandra clusters. It describes how to configure replication strategies to distribute data across DCs, maintain consistency levels, and handle reads and writes between DCs. It also covers adding a new DC, removing a DC, running repairs across DCs, and designing for failover between DCs in the event of network partitions or DC outages.

PostgreSQL Replication in 10 Minutes - SCALEPostgreSQL Experts, Inc.

This document summarizes a presentation about PostgreSQL replication. It discusses different replication terms like master/slave and primary/secondary. It also covers replication mechanisms like statement-based and binary replication. The document outlines how to configure and administer replication through files like postgresql.conf and recovery.conf. It discusses managing replication including failover, failback, remastering and replication lag. It also covers synchronous replication and cascading replication setups.

PGPool-II Load testingEDB

The document describes load testing of pgpool-II for stress testing, load balancing, and performance testing compared to a single PostgreSQL server. Large Amazon instances with PostgreSQL 9.3.2 and pgpool-II 3.3.3 were used. Pgbench testing with a 75% read/25% write workload was conducted at various scale factors and client levels to evaluate horizontal scaling and performance with increasing database and client size. Results showed that adding read replicas improved performance for large databases that exceeded server memory, while smaller databases in memory saw little benefit.

Scaling with sync_replication using Galera and EC2Marco Tusa

Ilya Kosmodemiansky - An ultimate guide to upgrading your PostgreSQL installa...PostgreSQL-Consulting

Even an experienced PostgreSQL DBA can not always say that upgrading between major versions of Postgres is an easy task, especially if there are some special requirements, such as downtime limitations or if something goes wrong. For less experienced DBAs anything more complex than dump/restore can be frustrating. In this talk I will describe why we need a special procedure to upgrade between major versions, how that can be achieved and what sort of problems can occur. I will review all possible ways to upgrade your cluster from classical pg_upgrade to old-school slony or modern methods like logical replication. For all approaches, I will give a brief explanation how it works (limited by the scope of this talk of course), examples how to perform upgrade and some advice on potentially problematic steps. Besides I will touch upon such topics as integration of upgrade tools and procedures with other software — connection brokers, operating system package managers, automation tools, etc. This talk would not be complete if I do not cover cases when something goes wrong and how to deal with such cases.

Streaming replication in practiceAlexey Lesovsky

This document discusses streaming replication in PostgreSQL. It covers how streaming replication works, including the write-ahead log and replication processes. It also discusses setting up replication between a primary and standby server, including configuring the servers and verifying replication is working properly. Monitoring replication is discussed along with views and functions for checking replication status. Maintenance tasks like adding or removing standbys and pausing replication are also mentioned.

Cassandra as MemcacheEdward Capriolo

Cassandra can be used as an alternative to Memcache for caching data from a database in order to improve performance. Cassandra offers advantages over Memcache like persistence of data, horizontal scaling, and simpler management as a single database tier rather than separate Memcache and database servers. While Memcache is faster for in-memory operations, Cassandra can serve data both from memory using caching as well as from disk, and offers different configuration options for balancing performance, consistency and fault tolerance.

MySQL Replication Overview -- PHPTek 2016Dave Stokes

MySQL replication allows data changes on a master server to be replicated to slave servers. It works by copying the master's binary log containing data changes to slaves. Replication can be statement-based, replicating SQL statements, or row-based, replicating row-level changes. Modern MySQL supports multi-threaded and multi-source replication topologies to improve performance and high availability. Utilities like mysqlrplcheck help configure and validate replication setups.

Oh&S In The It Workplacejorge_llama_guy

This document provides occupational health and safety tips for filing cabinets in the IT workplace. It recommends loading cabinets carefully to prevent top-heavy cabinets from falling over, only opening one drawer at a time, using cabinets with safety locks, distributing weight evenly and not overloading, choosing durable metal cabinets, and ensuring stable placement on solid ground. Proper handling and following the guidelines can prevent cabinet-related accidents.

Grade 6 Travel the World Assignmentlauramclean

The document summarizes a travel itinerary that included trips to Nova Scotia, Canada, Scotland, and Italy over 8 days. Some of the key details include: - In Nova Scotia, the traveler visited beaches, museums, and ate local cuisine while staying with family. - In Scotland, destinations included Edinburgh, Loch Ness, and Inverness. Activities involved tours, museums, dining, and visiting natural sites. - Italy involved trips to Rome, Venice, and surrounding areas. Landmarks like the Colosseum and canals were toured, along with local dining. - The total spent on the whole multi-country trip amounted to $6,015.48.

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This is a Quick Research Guide (QRG). QRGs include the following: - A brief, high-level overview of the QRG topic. - A milestone timeline for the QRG topic. - Links to various free online resource materials to provide a deeper dive into the QRG topic. - Conclusion and a recommendation for at least two books available in the SJPL system on the QRG topic. QRGs planned for the series: - Artificial Intelligence QRG - Quantum Computing QRG - Big Data Analytics QRG - Spacecraft Guidance, Navigation & Control QRG (coming 2026) - UK Home Computing & The Birth of ARM QRG (coming 2027) Any questions or comments? - Please contact Arthur Morgan at art_morgan@att.net. 100% human made.

5kW Solar System in India – Cost, Benefits & Subsidy 2025Ksquare Energy Pvt. Ltd.

With the cost of electricity increasing and ecological concerns becoming increasingly difficult to dismiss, numerous Indian homes and businesses are looking for improved means of meeting their energy requirements. That's where solar enters the picture not as a substitute, but as a trustworthy, long-term option. Among all the alternatives today, the 5kW solar system is a balanced option. It's strong enough for the majority of homes and small business installations, but small and inexpensive enough to bring about solar adoption at ease and efficiency. Explore the complete guide to 5kW solar system installation in India. Learn about cost, daily output, subsidy in 2025, benefits for homes & businesses, and how to apply in Gujarat.

Designing Low-Latency Systems with Rust and ScyllaDB: An Architectural Deep DiveScyllaDB

Want to learn practical tips for designing systems that can scale efficiently without compromising speed? Join us for a workshop where we’ll address these challenges head-on and explore how to architect low-latency systems using Rust. During this free interactive workshop oriented for developers, engineers, and architects, we’ll cover how Rust’s unique language features and the Tokio async runtime enable high-performance application development. As you explore key principles of designing low-latency systems with Rust, you will learn how to: - Create and compile a real-world app with Rust - Connect the application to ScyllaDB (NoSQL data store) - Negotiate tradeoffs related to data modeling and querying - Manage and monitor the database for consistently low latencies

Transcript: Canadian book publishing: Insights from the latest salary survey ...BookNet Canada

Join us for a presentation in partnership with the Association of Canadian Publishers (ACP) as they share results from the recently conducted Canadian Book Publishing Industry Salary Survey. This comprehensive survey provides key insights into average salaries across departments, roles, and demographic metrics. Members of ACP’s Diversity and Inclusion Committee will join us to unpack what the findings mean in the context of justice, equity, diversity, and inclusion in the industry. Results of the 2024 Canadian Book Publishing Industry Salary Survey: https://publishers.ca/wp-content/uploads/2025/04/ACP_Salary_Survey_FINAL-2.pdf Link to presentation slides and transcript: https://bnctechforum.ca/sessions/canadian-book-publishing-insights-from-the-latest-salary-survey/ Presented by BookNet Canada and the Association of Canadian Publishers on May 1, 2025 with support from the Department of Canadian Heritage.