The document describes a performance evaluation of Cassandra, Couchbase, HBase, and MongoDB under various workloads on an AWS infrastructure. It outlines the system configuration including instance types, storage, and database configuration parameters. It then presents results in graphs showing throughput and latency for each database as the workload intensity increases, covering workloads that involve different ratios of reads, writes, updates, inserts, and scans. Cassandra, Couchbase, HBase, and MongoDB each exhibited varying performance under the different workloads tested.
Evaluating NoSQL performance: Which database is right for your data? - Sergey...jaxLondonConference
Presented at JAX London 2013
The need to operate terabyte-size databases becomes very common these days. Unless you have implemented architectures that use NoSQL databases and frameworks that support data-intensive distributed applications, then many technology options available are probably a slight enigma. This session focuses on real-world successful attempts to benchmark four of the most popular NoSQL databases side by side. The base tool selected for the purpose of this research is Yahoo Cloud Serving Benchmark and benchmarking is performed on Amazon Elastic Compute Cloud instances.
This document provides instructions for accessing and configuring a Nexus 1000v VSM. It outlines steps to SSH into the VSM at IP 10.1.1.102 using username "admin" and password "cciedc01" or "Cciedc01". It also describes configuring two Nexus 5000 series switches N5K1 and N5K2 to allow VLAN 1 on various ports and interfaces to support the VSM, including the VPC peer link and ports 10 and 20. Finally, it mentions allowing VLAN 1 on the vNICs such as eth0 and eth1 of the VSM template to see the VEM after completing the outlined configuration.
This document provides configuration notes for using the Intel 82599 10G NIC's SRIOV functionality to assign virtual functions to a virtual machine on an Ubuntu Linux host. It outlines downloading the driver, declaring the number of virtual functions, verifying the modules and virtual functions are present on the host, creating an XML file to attach a virtual function to a VM, and verifying the VM can see the attached NIC.
This document discusses using SR-IOV and KVM virtual machines on Debian to virtualize high-performance servers requiring low latency and high throughput networking. It describes configuring SR-IOV on the server's Ethernet cards through the BIOS. On Debian, it shows enabling SR-IOV drivers in the kernel, configuring virtual functions, and assigning them to virtual machines using libvirt with PCI device passthrough. VLAN tagging and MAC addresses must be configured separately on the host due to limitations of the Debian version used.
In the second part of a 4 series presentation, I will go over how to configure 2 CentOS servers to operate on dedicated VLANs with a FortiGate appliance.
YouTube presentation is available here: https://www.youtube.com/watch?v=GqwRov972ng
This document summarizes the new features in Cumulus Linux 2.5.4 compared to 2.5.3, including:
1) Support for new hardware models including a PoE switch and a Penguin switch.
2) Enhancements to network virtualization including LNV, head end replication in VXLAN active-active mode.
3) A new management VRF feature to separate management and data plane traffic.
Evaluating NoSQL performance: Which database is right for your data? - Sergey...jaxLondonConference
Presented at JAX London 2013
The need to operate terabyte-size databases becomes very common these days. Unless you have implemented architectures that use NoSQL databases and frameworks that support data-intensive distributed applications, then many technology options available are probably a slight enigma. This session focuses on real-world successful attempts to benchmark four of the most popular NoSQL databases side by side. The base tool selected for the purpose of this research is Yahoo Cloud Serving Benchmark and benchmarking is performed on Amazon Elastic Compute Cloud instances.
This document provides instructions for accessing and configuring a Nexus 1000v VSM. It outlines steps to SSH into the VSM at IP 10.1.1.102 using username "admin" and password "cciedc01" or "Cciedc01". It also describes configuring two Nexus 5000 series switches N5K1 and N5K2 to allow VLAN 1 on various ports and interfaces to support the VSM, including the VPC peer link and ports 10 and 20. Finally, it mentions allowing VLAN 1 on the vNICs such as eth0 and eth1 of the VSM template to see the VEM after completing the outlined configuration.
This document provides configuration notes for using the Intel 82599 10G NIC's SRIOV functionality to assign virtual functions to a virtual machine on an Ubuntu Linux host. It outlines downloading the driver, declaring the number of virtual functions, verifying the modules and virtual functions are present on the host, creating an XML file to attach a virtual function to a VM, and verifying the VM can see the attached NIC.
This document discusses using SR-IOV and KVM virtual machines on Debian to virtualize high-performance servers requiring low latency and high throughput networking. It describes configuring SR-IOV on the server's Ethernet cards through the BIOS. On Debian, it shows enabling SR-IOV drivers in the kernel, configuring virtual functions, and assigning them to virtual machines using libvirt with PCI device passthrough. VLAN tagging and MAC addresses must be configured separately on the host due to limitations of the Debian version used.
In the second part of a 4 series presentation, I will go over how to configure 2 CentOS servers to operate on dedicated VLANs with a FortiGate appliance.
YouTube presentation is available here: https://www.youtube.com/watch?v=GqwRov972ng
This document summarizes the new features in Cumulus Linux 2.5.4 compared to 2.5.3, including:
1) Support for new hardware models including a PoE switch and a Penguin switch.
2) Enhancements to network virtualization including LNV, head end replication in VXLAN active-active mode.
3) A new management VRF feature to separate management and data plane traffic.
Using vSAN technology for hosted private cloud storageOVHcloud
Storage represents an increasingly complex challenge for growing organisations. In this session, Daniel Pascua and Timo Sugliani demonstrate how vSAN technology can provide both minimal latency and high performance for specific workloads, including hands-on examples of configuring and operating clusters.
Slawomir Janukowicz, Juniper Networks
Juniper Day, Praha, 13.5.2015
Jestliže SlideShare nezobrazí prezentaci korektně, můžete si ji stáhnout ve formátu .ppsx nebo .pdf (kliknutím na tlačitko v dolní liště snímků).
Introduction to nexux from zero to HeroDhruv Sharma
The document provides information about Cisco Nexus switches, including the Nexus 7000 and 7700 series switches. It describes the key components of Nexus switches like chassis, I/O modules, supervisor engines, and fabric modules. It also compares different Nexus 7000 and 7700 chassis models in terms of specifications like slots, bandwidth, switching capacity, and port density. Additionally, it discusses some differences between Nexus switches and Cisco Catalyst switches, such as licensing requirements, user accounts, NX-OS image structure, and use of port profiles instead of macros. Finally, it provides an overview of features supported on Nexus switches like virtual device contexts (VDCs).
VDCF is a management tool for virtualizing and monitoring Solaris environments. It allows centralized installation, operation, migration, monitoring, security, hardening and disaster recovery of Solaris zones, LDoms, and bare metal servers. VDCF provides simplicity, standardization, and high availability for private clouds. It has been in production use since 2006 to virtualize and manage Solaris environments.
This document provides instructions for building a low-cost wireless router using old computer parts and a Mikrotik RouterOS. The necessary components include a motherboard, RAM, hard drive, network card, wireless MiniPCI card, and RouterOS software. It estimates the total cost to be around 1 million Rupiah. It describes assembling the computer, installing the wireless card and RouterOS, and provides options for powering the device either through the network cable or a power supply. Setup instructions for the wireless settings in RouterOS are also included.
Отказоустойчивость с использованием Cisco ASA ClusteringCisco Russia
Отказоустойчивость с использованием Cisco ASA Clustering - принципы работы, ограничения, диагностика.
Ссылка на запись вебинара: https://www.youtube.com/watch?v=h73ZVhSqd64
Cisco ASA 5515-X supports Active/Active and Acitve/standby failover to enable the firewall redundancy. It delivers up to 1.2 Gbps stateful inspection throughput, 250 IPsec VPN peers, 250,000 concurrent connections and 1 expansion slot, which makes it ideally suited for the small, mid-size enterprises or branch offices.
Learn from the best of Industry Trainers .11 Full CCIE DC Racks based in New Jersey USA and Bangalore India .Call us or emails us rack@networkershome.com or info@networkershome.com
BRKVIR-3013 Deploying and Troubleshooting the Nexus 1000v Virtual Switch on ...Rassul Ismailov
The document discusses deploying and troubleshooting the Cisco Nexus 1000v virtual switch on VMware vSphere. It covers implementing the deployment, optimizing and sustaining the solution through high availability, best practices and tools, and operating the solution through troubleshooting. The agenda includes deploying the virtual supervisor module (VSM) and virtual Ethernet module (VEM), establishing the connection between the VSM and vCenter Server, creating port profiles and adding uplink ports. It provides guidance on installation, configuration, operation and maintenance of the Nexus 1000v solution.
The document provides information on converting configurations from Cisco and Juniper devices to Cumulus Linux. It covers topics such as interface configuration, VLANs, trunks, access ports, EtherChannels/bonds, spanning tree, and access lists. Configuration examples are provided side-by-side for Cumulus Linux and Cisco/Juniper/Arista/Nexus syntax to highlight the differences.
The document describes how to configure active/active failover on Cisco ASA firewalls. Key steps include:
1) Configuring both ASA devices in multiple context mode.
2) Creating failover groups and assigning contexts to each group.
3) Configuring failover and stateful failover interfaces on each device.
4) Assigning IP addresses to interfaces in each context.
This allows both devices to remain active and share the load, improving firewall throughput and availability.
The document discusses static routing configuration on routers. It explains that static routes are manually configured by network administrators, while dynamic routes are adjusted automatically by routing protocols. It provides details on configuring unidirectional static routes to allow communication to and from stub networks. The ip route command is used to define static routes, specifying the IP address, interface, and other parameters. The show ip route command can verify that static routes are properly configured, identified by an "S" in the output.
The document discusses IBM's BladeCenter switch module and I/O portfolios. It describes various Ethernet, Fibre Channel, InfiniBand, and converged network adapter modules, switches, and pass-through options available from IBM and partners like Cisco, Broadcom, Emulex, QLogic, Mellanox, and Brocade to provide flexible and high-speed I/O connectivity for IBM BladeCenter systems. Specific product part numbers and capabilities are listed.
This document discusses Microsoft Azure services including Windows Azure, SQL Azure, and Windows Azure AppFabric. Windows Azure provides compute and storage services with no need to acquire or maintain servers. SQL Azure provides cloud-based relational databases. Windows Azure AppFabric enables communication between applications and services. Pricing information is also included for the different Azure services.
This presentation contains information on the test environment, settings, major criteria for evaluation, and component diagrams that can help you to test a NoSQL data store for your project. It also provides a matrix that compares a number of NoSQL products based on our test results. We also list the issues we encountered and some approaches we used to overcome them.
For more independent research into Hadoop, NoSQL, and other big data technologies, please visit www.altoros.com/research-papers or follow @altoros.
The document provides an overview of the EMC VNX storage system. It includes 21 modules covering topics like unified management, storage configuration, block and file provisioning, host integration, data protection features like replication and snapshots, and file system configuration. It also lists the various VNX models that scale up to 1500 drives and 1 million IOPS and provides flexible connectivity. The document is intended as a training guide for EMC customers and includes internal links to additional learning resources.
This document provides an overview of the EMC VNX storage system. It includes 14 modules that cover topics such as unified management, block and file storage provisioning, data protection features, host integration, and more. The document also lists system limits and specifications for the different VNX models. It aims to educate customers on the technical capabilities and features of the VNX platform.
Using vSAN technology for hosted private cloud storageOVHcloud
Storage represents an increasingly complex challenge for growing organisations. In this session, Daniel Pascua and Timo Sugliani demonstrate how vSAN technology can provide both minimal latency and high performance for specific workloads, including hands-on examples of configuring and operating clusters.
Slawomir Janukowicz, Juniper Networks
Juniper Day, Praha, 13.5.2015
Jestliže SlideShare nezobrazí prezentaci korektně, můžete si ji stáhnout ve formátu .ppsx nebo .pdf (kliknutím na tlačitko v dolní liště snímků).
Introduction to nexux from zero to HeroDhruv Sharma
The document provides information about Cisco Nexus switches, including the Nexus 7000 and 7700 series switches. It describes the key components of Nexus switches like chassis, I/O modules, supervisor engines, and fabric modules. It also compares different Nexus 7000 and 7700 chassis models in terms of specifications like slots, bandwidth, switching capacity, and port density. Additionally, it discusses some differences between Nexus switches and Cisco Catalyst switches, such as licensing requirements, user accounts, NX-OS image structure, and use of port profiles instead of macros. Finally, it provides an overview of features supported on Nexus switches like virtual device contexts (VDCs).
VDCF is a management tool for virtualizing and monitoring Solaris environments. It allows centralized installation, operation, migration, monitoring, security, hardening and disaster recovery of Solaris zones, LDoms, and bare metal servers. VDCF provides simplicity, standardization, and high availability for private clouds. It has been in production use since 2006 to virtualize and manage Solaris environments.
This document provides instructions for building a low-cost wireless router using old computer parts and a Mikrotik RouterOS. The necessary components include a motherboard, RAM, hard drive, network card, wireless MiniPCI card, and RouterOS software. It estimates the total cost to be around 1 million Rupiah. It describes assembling the computer, installing the wireless card and RouterOS, and provides options for powering the device either through the network cable or a power supply. Setup instructions for the wireless settings in RouterOS are also included.
Отказоустойчивость с использованием Cisco ASA ClusteringCisco Russia
Отказоустойчивость с использованием Cisco ASA Clustering - принципы работы, ограничения, диагностика.
Ссылка на запись вебинара: https://www.youtube.com/watch?v=h73ZVhSqd64
Cisco ASA 5515-X supports Active/Active and Acitve/standby failover to enable the firewall redundancy. It delivers up to 1.2 Gbps stateful inspection throughput, 250 IPsec VPN peers, 250,000 concurrent connections and 1 expansion slot, which makes it ideally suited for the small, mid-size enterprises or branch offices.
Learn from the best of Industry Trainers .11 Full CCIE DC Racks based in New Jersey USA and Bangalore India .Call us or emails us rack@networkershome.com or info@networkershome.com
BRKVIR-3013 Deploying and Troubleshooting the Nexus 1000v Virtual Switch on ...Rassul Ismailov
The document discusses deploying and troubleshooting the Cisco Nexus 1000v virtual switch on VMware vSphere. It covers implementing the deployment, optimizing and sustaining the solution through high availability, best practices and tools, and operating the solution through troubleshooting. The agenda includes deploying the virtual supervisor module (VSM) and virtual Ethernet module (VEM), establishing the connection between the VSM and vCenter Server, creating port profiles and adding uplink ports. It provides guidance on installation, configuration, operation and maintenance of the Nexus 1000v solution.
The document provides information on converting configurations from Cisco and Juniper devices to Cumulus Linux. It covers topics such as interface configuration, VLANs, trunks, access ports, EtherChannels/bonds, spanning tree, and access lists. Configuration examples are provided side-by-side for Cumulus Linux and Cisco/Juniper/Arista/Nexus syntax to highlight the differences.
The document describes how to configure active/active failover on Cisco ASA firewalls. Key steps include:
1) Configuring both ASA devices in multiple context mode.
2) Creating failover groups and assigning contexts to each group.
3) Configuring failover and stateful failover interfaces on each device.
4) Assigning IP addresses to interfaces in each context.
This allows both devices to remain active and share the load, improving firewall throughput and availability.
The document discusses static routing configuration on routers. It explains that static routes are manually configured by network administrators, while dynamic routes are adjusted automatically by routing protocols. It provides details on configuring unidirectional static routes to allow communication to and from stub networks. The ip route command is used to define static routes, specifying the IP address, interface, and other parameters. The show ip route command can verify that static routes are properly configured, identified by an "S" in the output.
The document discusses IBM's BladeCenter switch module and I/O portfolios. It describes various Ethernet, Fibre Channel, InfiniBand, and converged network adapter modules, switches, and pass-through options available from IBM and partners like Cisco, Broadcom, Emulex, QLogic, Mellanox, and Brocade to provide flexible and high-speed I/O connectivity for IBM BladeCenter systems. Specific product part numbers and capabilities are listed.
This document discusses Microsoft Azure services including Windows Azure, SQL Azure, and Windows Azure AppFabric. Windows Azure provides compute and storage services with no need to acquire or maintain servers. SQL Azure provides cloud-based relational databases. Windows Azure AppFabric enables communication between applications and services. Pricing information is also included for the different Azure services.
This presentation contains information on the test environment, settings, major criteria for evaluation, and component diagrams that can help you to test a NoSQL data store for your project. It also provides a matrix that compares a number of NoSQL products based on our test results. We also list the issues we encountered and some approaches we used to overcome them.
For more independent research into Hadoop, NoSQL, and other big data technologies, please visit www.altoros.com/research-papers or follow @altoros.
The document provides an overview of the EMC VNX storage system. It includes 21 modules covering topics like unified management, storage configuration, block and file provisioning, host integration, data protection features like replication and snapshots, and file system configuration. It also lists the various VNX models that scale up to 1500 drives and 1 million IOPS and provides flexible connectivity. The document is intended as a training guide for EMC customers and includes internal links to additional learning resources.
This document provides an overview of the EMC VNX storage system. It includes 14 modules that cover topics such as unified management, block and file storage provisioning, data protection features, host integration, and more. The document also lists system limits and specifications for the different VNX models. It aims to educate customers on the technical capabilities and features of the VNX platform.
The document provides an overview of Arista's technical forum on hardware and software updates for autumn 2015. It discusses new operational features in EOS 4.15 including a bug portal and transfer of information portal. It also covers how cloud servers and storage are driving adoption of 25GbE and 50GbE to maximize throughput and efficiency. The document summarizes Arista's role in standardizing 25GbE and describes their portfolio of switches that support flexible 25GbE, 50GbE and 100GbE speeds including the new 7320X series.
The document discusses various configurations for EMC VNX storage arrays. It describes a configuration for consolidating Oracle workloads using a VNX5400 array with SSD caching and storage pools for VMs, Oracle redo logs, backups and data. It also outlines a configuration for virtualization with a VNX5400 providing over 50TiB of capacity for 500 VMs. Charts show how these configurations can be expanded through additional storage array extensions as capacity and performance needs grow.
In this presentation, we will cover basic requirements and supported topologies for Multizone AP, how to bring up APs in multi version and how the AP's image upgrade differs in 8.x
Check out the webinar recording where this presentation was used: http://community.arubanetworks.com/t5/Wireless-Access/Technical-Webinar-Recording-Slides-Multi-zone-AP-and-Centralized/td-p/308499
StorPool Storage presenting at Storage Field Day 25pdfStorPool Storage
Storage Field Day 25 took place on March 22–23, 2023, and gathered industry leaders and storage analysts in an exciting 2-day meet up with technical presentations. StorPool Storage participated in the event, and our team showcased our storage platform, its capabilities, and improvements.
Learn more: Watch now the recording of the presentation: https://storpool.com/blog/storpool-presents-at-storage-field-day-25-video-recordings
Deploying flash storage for Ceph without compromising performance Ceph Community
This document summarizes a presentation about deploying flash storage for Ceph. It discusses how faster networks like 40GbE and 56GbE can accelerate Ceph performance. It also covers optimizing Ceph for flash storage and adding RDMA networking. Example Ceph solutions from companies like Fujitsu, StorageFoundry, SanDisk, OnyxCCS and Flextronics are briefly mentioned.
Intel & QLogic NIC performance test results v0.2David Pasek
This document summarizes test results from an HPE lab that compared network performance of VMs using Intel X710 and Qlogic FastLinQ QL41xxx NICs passed through to ESXi hosts. A variety of TCP, UDP, HTTP and HTTPS network throughput tests were run between VMs on the two hosts. In most tests, the Intel and Qlogic NICs performed comparably, with Qlogic outperforming Intel in some UDP and HTTP tests when using receive-side scaling. The tests helped validate that the Qlogic NIC meets expectations for VM network throughput.
The Cisco Unified Computing System™ is a next-generation data center platform that unites compute, network, storage access, and virtualization into a cohesive system designed to reduce total cost of ownership (TCO) and increase business agility. The
system integrates a low-latency, lossless 10 Gigabit Ethernet unified network fabric with enterprise-class, x86-architecture servers. The system is an integrated, scalable, multichassis platform in which all resources participate in a unified management domain.
From the Austin 2016 OpenStack Summit. Covers ScaleIO integration with OpenStack and a demo. Video from session can be viewed here: https://www.youtube.com/watch?v=HY0H1-uCmbE
Ceph Day Berlin: Deploying Flash Storage for Ceph without Compromising Perfor...Ceph Community
This document discusses using Mellanox high-performance interconnect solutions to unleash the potential of Ceph over flash storage. It provides examples of how customers deploy Ceph with Mellanox interconnects to build scalable, high-performance storage solutions at low cost. It also summarizes the performance benefits of using RDMA with Ceph, including read performance up to 8x better and write performance up to 2x better with tuning when using flash storage for Ceph object storage daemons (OSDs).
Flexing Network Muscle with IBM Flex System Fabric TechnologyBrocade
How can Fabric based networking technology benefit your solutions? IBM Flex System offers both Ethernet and Fibre Channel Fabric technologies from Brocade that provide Flex Solutions the ideal muscle" for building today's intelligent Data Center infrastructures ready for massive virtualization scalability. This session shows the values of both FC and Enet Fabric technologies such as 33% increased performance / server virtualization / hardware consolidation and 70% lower operational expenses all while greatly increasing the availability of your solution. We will also review basic Fabric design principles for simple and flexible single chassis to multi-chassis scalability "on demand".
Ceph Day SF 2015 - Deploying flash storage for Ceph without compromising perf...Ceph Community
This document discusses deploying flash storage for Ceph and the benefits of high performance networking. It summarizes Mellanox's solutions for accelerating Ceph performance using 40GbE and 56GbE networking as well as upcoming optimizations from RDMA messaging. Benchmark results show significant improvements to Ceph throughput and latency from these technologies.
The document provides an overview of I/O virtualization and how it enables cloud computing by connecting any server to any storage or network device quickly and flexibly. It discusses how I/O virtualization addresses challenges like inefficient resource utilization and high costs. It also explains how I/O virtualization completes the cloud model by allowing dynamic allocation of network and storage resources to virtual machines.
Ceph QoS: How to support QoS in distributed storage system - Taewoong KimCeph Community
This document discusses supporting quality of service (QoS) in distributed storage systems like Ceph. It describes how SK Telecom has contributed to QoS support in Ceph, including an algorithm called dmClock that controls I/O request scheduling according to administrator-configured policies. It also details an outstanding I/O-based throttling mechanism to measure and regulate load. Finally, it discusses challenges like queue depth that can be addressed by increasing the number of scheduling threads, and outlines plans to improve and test Ceph's QoS features.
Cisco Catalyst 6500 Technical Deep Dive.pdfjuergenJaeckel
This document provides a technical deep dive into the Cisco Catalyst 6500 series of switches. It discusses the chassis architecture and power supplies of various Catalyst 6500 models. It then covers the supervisor engine and switch fabric architecture, including the Supervisor 720, Supervisor 32, and Supervisor 32 with PISA. The document also outlines the Cisco IOS boot process and module architecture before discussing layer 2, IPv4, and IPv4 multicast forwarding as well as packet walks.
Taking Cloud to Extremes: Scaled-down, Highly Available, and Mission-critical...Altoros
We consider uses cases typical for some advanced applications of Cloud architectures incorporating Cloud Foundry PaaS. High-Availability, Fault-Tolerance, scaling down to smaller form-factors while operating in mission-critical environments - all these requirements put constraints on architecture, configuration, and testing. Cloud Foundry's operation depends on the number of external and internal dependencies. Points of failure may exist on different levels stretching from hardware / IaaS foundation to microservices.
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Cоветs по оптимизации игр, Александр ДежуркоIT Share
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Abstract:Often referred to as NoSQL, non-relational databases feature elasticity and scalability in combination with a capability to store big data and work with cloud computing systems, all of which make them extremely popular. NoSQL data management systems are inherently schema-free (with no obsessive complexity and a flexible data model) and eventually consistent (complying with BASE rather than ACID). They have a simple API, serve huge amounts of data and provide high throughput. In 2013, the number of NoSQL products reached 150+ and the figure is still growing. That variety makes it difficult to select the best tool for a particular case. Database vendors usually measure productivity of their products with custom hardware and software settings designed to demonstrate the advantages of their solutions.
Mostly NoSQL databases differ from relational databases in their data model. These systems are classified into 4 groups.A. Key Value StoresKey value stores are similar to maps or dictionaries where data is addressed by a unique key.B. Document StoresDocument Stores encapsulate key value pairs in JSON or JSON like documents. Within documents, keys have to be unique. In contrast to key value stores,values are not opaque to the system and can be queried as well. Therefore, complex data structures like nested objects can be handled more conveniently. Storing data in interpretable JSONdocuments have the additional advantage of supporting data types, which makes document stores very developer-friendly. C. Column Family StoresColumn Family Stores are also known as column oriented stores, extensible record stores and wide columnar stores.D. Graph databasesKey value stores, document stores and column family stores have in common, that they do store denormalized data in order to gain advantages in distribution.In contrast to relational databases and the already introduced key oriented NoSQL databases, graph databases are specialized on efficient management of heavily linked data.NoSQL databases differ strongly in their offered query functionalities. Besides considering the supported data model and how it influences queries on specific attributes, it isnecessary to have a closer look on the offered interfaces in order to find a suitable database for a specific use case. If a simple, language unspecific API is required, REST interfacescan be a suitable solution especially for web applications, whereas performance critical queries should be exchanged over language specific APls which are available for nearly every common programming language like Java. Query languages offering a higher abstraction level in order to reduce complexity. Therefore, their use is very helpful when more complicated queries should be handled. If calculation intensive queries over large datasets are required, MapReduce frameworks should be used.Multiversion concurrency control (MVCC) relaxes strict consistency in favor of performance. Concurrent access is not managed with locks but by organization of many unmodifiable chronological ordered versions.In order to support transactions without reserving multiple datasets for exclusive access, optimistic locking is provided by many stores. Before changed data is committed, each transaction checks, whether another transactions made any conflicting modifications to the same datasets.NoSQL databases differ in their way they distribute data on multiple machines. Since data models of key value stores, document stores and column family stores are key oriented, the two common partition strategies are based on keys, too.The first strategy distributes datasets by the range of their keys. A routing server splits the whole keyset into blocks andallocates these blocks to different nodes. Afterwards, one node is responsible for storage and request handling of his specifickey ranges. In order to find a certain key, clients have to contact the routing server for getting the partition table.Higher availability and much simpler cluster architecture can be achieved with the second distributionstrategy called consistent hashing [27]. In this shared nothing architecture, there exists no single point of failure. In contrastto range based partitioning, keys are distributed by using hash functions. Since every server is responsible for a certain hashregion, addresses of certain keys within the cluster can be calculated very fast. Good hash functions distribute keysintuitively even wherefore an additional load balancer is not required.In addition to better read performance through load balancing, replication brings also better availability and durability, because failing nodes can be replaced by otherservers. Since distributed databases should be able to cope with temporary node and network failures, only full availability or full consistency can be guaranteed atone time in distributed systems. If all replicas of a master server were updated synchronously, the system would not be available until all slaves had committed a write operation. Ifmessages got lost due to network problems, the system would not be available for a longer period of time. For platformswhich rely on high availability, this solution is not suitable ?ecause even a few milliseconds of latency can have big Influences on user behavior.
For benchmarking, we used Yahoo Cloud Serving Benchmark, which consists of the following components:a framework with a workload generatora set of workload scenariosThe workload defines the data that will be loaded into the database during the loading phase, and the operations that will be executed against the data set during the transaction phase.ypically, a workload is a combination of: Workload java class (subclass of com.yahoo.ycsb.Workload) Parameter file (in the Java Properties format)Because the properties of the dataset must be known during the loading phase (so that the proper kind of record can be constructed and inserted) and during the transaction phase (so that the correct record ids and fields can be referred to) a single set of properties is shared among both phases. Thus the parameter file is used in both phases. The workload java class uses those properties to either insert records (loading phase) or execute transactions against those records (transaction phase). We have measured database performance under certain types of workloads. A workload was defined by different distributions assigned to the two main choices:which operation to performwhich record to read or write Operations against a data store were randomly selected and could be of the following types:Insert: Inserts a new record.Update: Updates a record by replacing the value of one field.Read: Reads a record, either one randomly selected field, or all fields.Scan: Scans records in order, starting at a randomly selected record key. The number of records to scan is also selected randomly from the range between 1 and 100.
Each workload was targeted at a table of 100,000,000 records; each record was 1,000 bytes in size and contained 10 fields. A primary key identified each record, which was a string, such as “user234123.” Each field was named field0, field1, and so on. The values in each field were random strings of ASCII characters, 100 bytes each. Database performance was defined by the speed at which a database computed basic operations. A basic operation is an action performed by the workload executor, which drives multiple client threads. Each thread executes a sequential series of operations by making calls to the database interface layer both to load the database (the load phase) and to execute the workload (the transaction phase). The threads throttle the rate at which they generate requests, so that we may directly control the offered load against the database. In addition, the threads measure the latency and achieved throughput of their operations and report these measurements to the statistics module.
For every benchmark we define what to test – database client and how to test - target throughput – how many operations is to run per second, number of concurrent threads running on YCSBclient side and how many operations to execute for particular database. Every client thread reports it’s progress to Statistics module, which prints the output of test to console where benchmark is started.
Cassandra configuration conf/cassandra.yaml# Maximum size of the row cache in memory.# NOTE: if you reduce the size, you may not get you hottest keys loaded on startup.## Default value is 0, to disable row caching.row_cache_size_in_mb: 6096Hbaseconfig file /etc/hbase – when configured from RPM, and /hbase/config
Workload A: Update-heavily mode. Workload A is an update-heavily scenario that simulates the database work, during which typical actions of an e-commerce solution user are recorded.Settings for the workload: Read/update ratio: 50/50Zipfian request distributionWorkload BWorkload B is a read-mostly workload that has 95/5 read/update ratio. It recaps content tagging, when adding a tag is an update, but most operations include reading tags.Workload CWorkload C is a read-only workload that simulates a data caching layer, for example a user profile cache.Workload D Workload D has 95/5 read/insert ratio. The workload simulates access to the latest data, such as user status updates or working with inbox messages first.Workload EWorkload E is a scan-short-ranges workload with a scan/insert percentile proportion of 95/5. It corresponds to threaded conversations that are clustered by a thread ID. Each scan is performed for the posts of a given thread.Workload F Workload F has read-modify-write/read ops in a proportion of 50/50. It simulates access to user database, where user records are read and modified by the user. User activity is also recorded to this database.Workload G Workload G has a 10/90 read/insert ratio. It simulates data migration process or highly intensive data creation.
hbase - наименьшая производительность ожидаема, так как был включен AutoFlush, это позволяет достичь strong consistency, но заметно влияет на производительность записи. AutoFlush - опция которая включает запись данных на сервер, сразу после того как мы сделали put в клиенте, когда опция выключена, то для записи нужно либо явно вызывать метод flush(), либо он вызывается по мере заполнения клиентского буфера (размер буфера также настраивается).cassandra, couchbase - кассандра обновляет данные в памяти и синхронно пишет логтранзакций на диск, couchbase пишет в память и ставит в очередь записи на диск, работа с диском происходит в асинхронном режиме.
As you can see, there is no perfect NoSQL database. Every database has its advantages and disadvantages that become more or less important depending on your preferences and the type of tasks. For example, a database can demonstrate excellent performance, but once the amount of records exceeds a certain limit, the speed falls dramatically. It means that this particular solution can be good for moderate data loads and extremely fast computations, but it would not be suitable for jobs that require a lot of reads and writes. In addition, database performance also depends on the capacity of your hardware.