The method for testing was limit the bandwidth between two nodes in our Galera test cluster (4 cores and 8GB of memory) to 300Mbit, force SST to happen on one node and then measure the time between the SST to start and the moment when the node has rejoined the cluster. The amount of bytes transferred was measured through the network interface and we re-ran each method three times to get a reliable outcome.
During the startup-years - Dirk-Willem van Gulik helped shape the world-wide-web. He was one of the founders, and the first president, of the Apache Software Foundation; and worked on standards such as HTTP at the Internet Engineering Taskforce. He has worked for the Joint Research Centre of the European Commission, the United Nations, telecommunications firms, the BBC, several satellite&space agencies and founded several startups. He participated in different international standards bodies, such as the IETF and W3C on metadata, GIS, PKI, Security, Architecture and Internet standards. Dirk build the initial engineering team at Covalent - the first open source company; and was one of the Founders of Asemantics, a leader in Enterprise Information Integration; which helped make the Semantic Web a reality. He then initiated Joost.com, a peer to peer based video and build and lead the team that created the worlds first instant play P2P viewer and a back office system with user profile driven advert targeting and payment settlements. He was the Chief Technical Architect at the BBC where has helped shape the audience facing delivery platform Forge in the time for the Olympics and where he made information security and compliance a core enabler for business processes. He currently works on several medical and privacy intensive security projects with a heavy emphasis on Architecture and Governance. When not at work, he loves to sail, hang out at the makerspaceleiden.nl or play with his lego.
How to Manage ProxySQL Cluster with Core and Satellite Nodes
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Temporal graphs capture the development of relationships within data throughout time. This model fits naturally within a streaming architecture, where new events can be inserted directly into the graph upon arrival from a data source, being compared to related entities or historical state. However, the vast majority of graph processing systems only consider traditional graph analysis on static data, with some outliers supporting batched updating and temporal analysis across graph snapshots. This talk will cover recent work defining a temporal graph model which can be updated via event streams and investigating the challenges of distribution and graph maintenance. Some notable challenges within this include partitioning a graph built from a stream, with the additional complexity of managing trade-offs between structural locality (proximity to neighbours) and temporal locality (proximity to an entities history). Synchronising graph state across the cluster and handling out-of-order updates, without a central ground truth limiting scalability. Managing memory constraints and performing analysis in parallel with ongoing update ingestion.To address these challenges, we introduce Raphtory, a system which maintains temporal graphs over a distributed set of partitions, ingesting and processing parallel updates in near real-time. Raphtory's core components consist of Graph Routers and Graph Partition Managers. Graph Routers attach to a given input stream and convert raw data into graph updates, forwarding this to the Graph Partition Manager handling the affected entity. Graph Partition Managers contain a partition of the overall graph, inserting updates into the histories of affected entities at the correct chronological position. This removes the need for centralised synchronisation, as commands may be executed in any given arrival order whilst resulting in the same history. To deal with memory constraints, Partition Managers both compress older history and set an absolute threshold for memory usage. If this threshold is met a cut-off point is established, requiring all updates prior to this time to be transferred to offline storage. Once established and ingesting the selected input, analysis on the graph is permitted via Analysis Managers. These connect to the cluster, broadcasting requests to all Partition Managers who execute the algorithm. Analysis may be completed on the live graph (most up-to-date version), any point back through its history or as a temporal query over a range of time. Additionally, multiple Analysis Managers may operate concurrently on the graph with previously unseen algorithms compiled at run-time, thus allowing modification of ongoing analysis without re-ingesting the data.Raphtory is an ongoing project, but is open source and available for use now. Raphtory is fully containerised for ease of installation and deployment and much work has gone into making it simple for users to ingest their own data sources, create custom routers and perform their desired analysis.The proposed talk will discuss the benefits of viewing data as a temporal graph, the current version of Raphtory and how someone could get involved with the project. We shall also touch on several areas of possible expansion at the end for discussion with those interested.
Tasks in Ada are effective to speed up computations on multicoreprocessors. In writing parallel programs we determine the granularityof the parallelism with respect to the memory management. We have todecide on the size of each job, the mapping of the jobs to the tasks,and on the location of the input and output data for each job. 2ff7e9595c
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