This article explains how Hadoop's MapReduce shuffle uses a circular buffer data structure to store serialized key/value pairs and their metadata in memory, describes its initialization, write path, spill handling, and the underlying algorithms that ensure efficient in‑memory sorting and disk spilling.
This article outlines a typical big data platform architecture, detailing its core layers—data acquisition, storage and analysis, sharing, application, real‑time computation, and task scheduling—while introducing key technologies such as Flume, HDFS, Hive, Spark, DataX, and monitoring considerations.
The article outlines a typical big data platform architecture, detailing its core layers—data collection, storage and analysis, sharing, application, real-time computation, and task scheduling—while describing key technologies such as Flume, DataX, HDFS, Hive, Spark, Spark Streaming, and Redis.
This article explains Hadoop's data splitting concepts, the distinction between HDFS blocks and logical InputSplits, details the source code of various InputFormats such as TextInputFormat, CombineTextInputFormat, KeyValueTextInputFormat, NLineInputFormat, and custom InputFormats, and provides complete Java examples for Mapper, Reducer, and driver classes.
This article provides a comprehensive introduction to Apache Parquet, covering its origins, columnar storage advantages, nested schema support, internal architecture, storage model components, comparison with ORC, and practical tools for inspecting Parquet files.
Kudu is an open‑source columnar storage engine from Cloudera that combines high‑throughput batch processing with low‑latency random reads, offering features such as C++/Java APIs, Raft‑based replication, flexible consistency, partitioning, and integration with Hadoop, Spark, Impala, and other ecosystem components.
This guide walks through installing Hadoop on Windows, configuring environment variables and XML files, adding the required winutils binaries, verifying the setup with HDFS shell commands, and then building a Maven project that uses the Java API to list and inspect files in HDFS.
This guide explains how to use the HDFS shell (preferred via hdfs dfs) to list, copy, move, delete, and snapshot files in a Hadoop cluster, detailing command syntax, URI handling, generic options, and practical examples for each operation.
This article introduces Apache Hadoop’s open‑source framework, explains its core components such as HDFS, MapReduce, ZooKeeper, HBase, Hive, Pig, Mahout, Sqoop, Flume, Chukwa, Oozie, Ambari and YARN, and outlines the steps to set up a beginner‑level Hadoop cluster on CentOS 7.
This article compiles extensive interview questions and topics covering Hadoop, Spark, Flink, Hive, Kafka, MySQL, Redis, Java fundamentals, and algorithms, organized by companies such as Xiaomi, ByteDance, Alibaba, Shopee, Tencent, Meituan, NetEase, and Baidu, to help candidates prepare effectively for big‑data engineering roles.
This article introduces the most important and still mainstream components of the big data ecosystem—including Hadoop’s storage and compute framework, Hive data warehouse, HBase NoSQL database, Spark unified engine, Kafka messaging platform, and Elasticsearch search engine—explaining their core concepts, architectures, and typical use cases.
This article provides a comprehensive overview of Hadoop’s core components—including MapReduce programming model, HDFS storage architecture, and YARN resource management—while discussing common challenges like data skew and small files, and offering learning resources for aspiring big‑data engineers.
This article walks you through the complete installation and configuration of UCloud's free USDP (UCloud Data Platform) on a three‑node CentOS 7.2‑7.6 cluster, covering environment preparation, package download, repair scripts, MySQL setup, service startup, web UI activation, monitoring, and a quick Hive query example.
This extensive guide outlines a modern big‑data learning roadmap, covering essential programming languages, Linux, databases, distributed system theory, networking, offline and real‑time computation, message queues, data warehouses, algorithms, backend skills, interview preparation, and practical advice for building a personal knowledge system.
Apache Kudu 1.15.0 adds experimental multi‑row transaction support (currently INSERT and INSERT_IGNORE), Raft‑based master configuration tools, table comment synchronization with Hive Metastore, per‑table size and row‑count limits configurable via flags or the kudu table set_limit tool, a customizable Kerberos principal flag, and TLS v1.3 with optional cipher‑suite selection, collectively enhancing low‑latency random access and analytical capabilities in the Hadoop ecosystem.
This article explains how Tencent Cloud EMR integrated Hadoop YARN with Kubernetes Pods to create a hybrid online‑offline deployment, implement elastic autoscaling and multi‑label resource allocation, and achieve several‑hundred‑percent improvements in CPU utilization while preserving cluster stability.
Zhu Qi, the first iQIYI Hadoop Committer, illustrates how a decade‑long record of code contributions, deep understanding of distributed‑computing, and a company’s open‑source culture can transform a chemical‑materials graduate into a leading Apache Hadoop contributor, while the article outlines the Committer role and a three‑stage roadmap for aspiring contributors.
This article details the end‑to‑end upgrade of a 5000‑node Hadoop 2.6.0 cluster to Hadoop 3.2.1 at 58.com, covering HDFS migration, RBF and EC adoption, Yarn federation and rolling upgrades, MR3 integration, extensive compatibility testing, and operational lessons learned for large‑scale big‑data platforms.
This extensive article introduces Hive as a Hadoop‑based data warehouse, explains its architecture, core concepts, DDL/DML syntax, functions, performance‑optimization techniques, data‑skew handling, and provides a collection of common interview questions for Hive practitioners.
This article explains how UCloud's US3 object storage, combined with a custom Hadoop adapter, separates compute and storage, optimizes file system operations, and leverages caching and specialized APIs to dramatically reduce storage costs and improve read/write performance for large‑scale Hadoop workloads.
The article analyzes how cloud‑native concepts such as DevOps, micro‑services, continuous delivery, and containerization can be applied to big‑data foundations, outlining four guiding principles—industrialized delivery, cost quantification, load‑adaptive scaling, and data‑centric design—and describing concrete Hadoop‑based architectures and Tencent Cloud solutions that lower cost while boosting performance.
The article provides a comprehensive technical overview of Toutiao's rapid growth, detailing its massive user base, data collection and processing pipelines, user modeling, cold‑start strategies, recommendation engines, storage solutions, push notification mechanisms, and the underlying microservice and PaaS architecture.
This guide walks through preparing three Linux servers, installing JDK 1.8, configuring Hadoop core, HDFS, MapReduce, and YARN XML files, setting Java environment variables, formatting HDFS, and starting all services to access the Hadoop web UI.
The article explains the concept and advantages of data lakes, outlines the major storage and acceleration challenges they face, provides a checklist for ideal data‑lake solutions, and details how Alibaba Cloud's JindoFS addresses those challenges with object‑storage‑based, high‑performance, scalable features.
This article provides a comprehensive collection of interview-style questions and detailed answers covering Hive concepts, Hadoop architecture, MapReduce mechanics, HDFS operations, and performance optimization techniques for big‑data processing environments.
This article explains the small‑file problem in Spark SQL on HDFS, its impact on NameNode memory and query performance, describes how dynamic partition inserts and shuffle settings generate many files, and presents practical solutions such as partition‑based distribution, random bucketing and adaptive query execution to control file count.
This article details how a bank transformed its retail system data pipeline from a monolithic DB2 setup to a distributed Oracle‑Hadoop architecture, evaluated five extraction tools, selected Sqoop direct mode, and implemented customizations to achieve over 50% performance gains and reliable incremental data capture.
This article details a three‑part technical sharing that covers cost governance for offline Hadoop clusters, a large‑scale data‑center migration with architecture upgrades, and a tiered storage strategy using EC and COS to reduce storage costs and improve performance in a cloud‑native big‑data environment.
This article explains what small files are in Hadoop HDFS, how they degrade NameNode memory, RPC performance, and application throughput, and provides practical strategies—including detection, configuration, and merging techniques—to mitigate their impact on storage and processing layers.
This article explains Apache Ranger's role as a centralized security framework for Hadoop, detailing its key features, architecture, policy workflow, practical administration examples, and how to automate bulk policy management with Java and REST APIs.
This article provides a comprehensive overview of Hadoop, covering its origins, core components such as HDFS, MapReduce, and YARN, their architectures, data storage and processing mechanisms, fault‑tolerance features, scheduling strategies, and practical optimization techniques for large‑scale distributed computing.
Hadoop 3.x upgrades the platform to JDK 1.8 and introduces a range of enhancements across common components, HDFS, YARN, and MapReduce, including erasure coding, multi‑NameNode high availability, cgroup‑based resource isolation, native map‑output collectors, and split client libraries, while also adding support for Azure and Aliyun distributed file systems.
This article reviews the evolution, architecture, and key components of major Chinese big‑data platforms—including those of Taobao, Didi, Meituan, 360, Kuaishou, and JD—highlighting data ingestion, storage, processing engines, scheduling systems, and service‑oriented designs that underpin their large‑scale data operations.
The author recounts a month‑long, four‑round technical interview at Alibaba Mama, detailing phone, on‑site, and HR stages, with deep discussions on Spark, Kafka, Hadoop, platform design, and backend fundamentals, while sharing resource links for big‑data interview preparation.
This article compiles a comprehensive set of Hadoop interview questions covering HDFS write and read processes, architecture, fault‑tolerance, NameNode metadata management, MapReduce scheduling, combiner and partition roles, YARN scheduling strategies, and various optimization techniques for both MapReduce and HDFS.
Facing massive, heterogeneous logs from numerous payment services, Ctrip’s data team designed a unified logging framework that extends log4j2, streams logs via Kafka to HDFS using a customized Camus pipeline, partitions and stores data in ORC for efficient Hive analysis, while addressing format, storage, and performance challenges.
This article examines the pervasive small‑file issue in big‑data environments, explains its impact on storage and processing performance, and presents a comprehensive set of solutions—including file merging, Hadoop archives, SequenceFiles, HBase, CombineFileInputFormat, and Spark/Flink strategies—to mitigate metadata overhead and improve I/O efficiency.
This article details how eBay's ADI Hadoop team tackled a massive 10 PB, 10‑million‑file migration by optimizing DistCp with Fastcopy, load‑balancing, ACL handling, and failure recovery, ultimately completing the transfer within a two‑hour window while preserving cluster stability and performance.
This article explains what data skew is, why it occurs in large‑scale Hadoop and Spark jobs, illustrates typical scenarios that cause it, and provides practical strategies and platform‑specific optimizations to detect, mitigate, and prevent skew in big‑data processing pipelines.
The article explains why Hive tables generate many small files on HDFS, describes the performance impact on NameNode and MapReduce, and provides detailed configuration steps and compression techniques—including input and output file merging, various Hive file formats, and partition optimization—to efficiently manage storage and resource consumption in big‑data environments.
This tutorial provides a complete walkthrough for downloading Hadoop 2.8.2, setting up a three‑node master‑slave cluster, configuring core, HDFS, MapReduce and YARN settings, creating required directories, distributing the installation, starting the services, verifying the cluster status, and finally shutting it down.
This article details the evolution of 58.com’s commercial data warehouse across three phases—1.0, 2.0, and 3.0—covering its scale, four‑layer architecture, migration from legacy Hadoop‑MapReduce pipelines to Flume/Kafka and Flink streaming, code optimizations, monitoring, and productization for real‑time business insights.
This article explains the concept and benefits of data lakes, outlines the storage and acceleration challenges they pose, presents an ideal checklist for selecting a data lake solution, and evaluates Alibaba Cloud's JindoFS against that checklist, highlighting its capabilities for big‑data and AI workloads.
This article outlines the purpose, timing, procedures, tools, and optimization techniques for big data performance testing, providing detailed guidance on test planning, execution, metric collection, and analysis to ensure reliable and efficient big data system deployments.
This article explains Linux HugePages, how to view and configure them, demonstrates code and Kubernetes examples, and details how larger memory pages reduce management overhead and lock memory to improve performance for memory‑intensive services like databases and Hadoop.
This article explains what data skew is, why it occurs in large‑scale Hadoop and Spark jobs, how to recognize its symptoms such as stuck reducers or OOM executors, and presents practical strategies—including business‑level adjustments, code refactoring, and platform‑specific tuning—to mitigate the problem.
This article details the three‑stage evolution of 58.com’s commercial data warehouse, describing its massive scale, four‑layer architecture, technical challenges, migrations from MapReduce to Hive and Flink, real‑time streaming upgrades, and the resulting improvements in stability, accuracy, and timeliness.
The article describes the design, architecture, and operational details of a unified logging framework at Ctrip's payment center, covering log production via a Log4j2 extension, Kafka‑Camus collection, Hive/ORC storage, MapReduce parsing optimizations, and governance strategies for massive daily TB‑scale data.
This article explains what HBase is, describes its Master, RegionServer, and Zookeeper components, and provides detailed environment preparation and configuration steps—including host setup, SSH key distribution, JDK installation, HBase deployment, configuration file edits, and cluster startup—so you can run HBase on a Hadoop cluster.
This guide explains how to enable LZO compression in Hadoop by installing the twitter‑provided hadoop‑lzo library, updating core‑site.xml, synchronizing files across nodes, creating LZO indexes, and running a WordCount MapReduce job with LZO‑compressed output.
Apache Calcite 1.25.0, a dynamic data management framework for Hadoop, has been released, introducing support for spatial functions and SQL interval expressions, removing deprecated methods from the previous version, and providing updated Maven dependency coordinates for the core library.
This article provides a step‑by‑step tutorial on deploying a Spark‑based advertising data pipeline using Kudu, covering Hadoop setup, HDFS data loading, Spark application refactoring, Maven packaging, Yarn execution, and crontab scheduling for daily automated runs.
This article explains the principles, architecture, features, and step‑by‑step deployment of Apache Sentry with Kerberos to provide role‑based access control across Hadoop components such as Hive, Impala, and HDFS, including command‑line examples and visual diagrams.
This article provides a detailed introduction to HDFS, covering its application scenarios, core architecture, fault‑tolerance benefits, drawbacks such as high latency and small‑file inefficiency, essential shell and API commands, cluster management procedures, and newer Hadoop 2.0 features like HA, Federation, snapshots, ACLs, and heterogeneous storage.
This guide walks through setting up a Maven project, adding Hadoop dependencies, configuring Kerberos (krb5.conf and keytab), loading core‑site.xml, and providing Java utility classes to initialize the HDFS client and list files in an HA‑enabled Hadoop cluster.
This guide explains how to continuously collect web‑service user behavior logs, route them through Flume agents to Kafka, and finally ingest them with Spark Streaming into HDFS, covering environment preparation, configuration files, deployment steps, and verification procedures.
This article presents a comprehensive case study of migrating a 200‑plus node Hadoop offline platform across data centers, covering background, architecture, solution evaluation, detailed implementation steps, consistency checks, operational safeguards, encountered issues, and future recommendations.
This article explains how to enable Linux CGroup support in Hadoop Yarn NodeManager to limit container CPU usage, detailing required configuration properties, hierarchy setup, CPU limit parameters, and a critical kernel version caveat.
This guide explains how to retrieve Hadoop/YARN application logs using the History Server UI, Yarn command‑line tools, and direct HDFS log access, including commands for listing applications, fetching specific logs, and locating the remote log directory.
This article explains how Hadoop's Namenode persists metadata using FsImage and EditLog, describes the checkpoint process during startup, and details the role of SecondaryNamenode in merging these files for efficient recovery, while also encouraging readers to like and share the content.
The article outlines a three‑dimensional framework—technical depth, ecosystem breadth, and evolution capability—to help engineers decide which big‑data or stream‑processing technology (such as Hadoop, Spark, or Flink) is worth investing time in, and provides practical tips like using Google Trends and GitHub awesome lists.
This article describes ByteDance’s four‑year series of customizations to Hadoop YARN—covering utilization improvements, multi‑load scenario optimizations, stability enhancements, and multi‑region active‑active deployment—along with practical production experiences, architectural details, and future work directions.
This article details the 2015 hybrid data‑warehouse design implemented at Guangdong Huaxing Bank, explaining its real‑time, historical, and archival layers, the data‑bus concept, and how mixing in‑memory, relational, and Hadoop technologies addressed modern banking data‑volume, latency, and unstructured‑data challenges.
This article introduces Linux cgroups, explains their CPU subsystem files and parameters, demonstrates how to create and configure cgroups, and details how YARN leverages cgroups for CPU resource isolation through configuration settings and code implementations, comparing soft and hard limit approaches.
The article traces the evolution from on‑premise relational databases to self‑built Hadoop clusters, cloud‑hosted Hadoop, and finally to semi‑managed and serverless big‑data services, highlighting their advantages, challenges, and the four key pillars—security, elasticity, intelligence, and usability—that will shape the future of serverless big‑data analytics.
This article presents a comprehensive case study of 58.com’s massive Hadoop‑based offline computing platform, detailing its architecture, scaling challenges, performance‑tuning measures, YARN and SparkSQL upgrades, and the systematic cross‑data‑center migration of thousands of nodes and petabytes of data.
Apache Avro is a high‑performance binary data serialization system originating from Hadoop that uses JSON‑defined schemas to enable compact storage, efficient network transfer, container file formats for MapReduce, and RPC communication without requiring code generation or explicit field numbers.
This article provides a comprehensive guide on detecting Hadoop system bottlenecks, analyzing resource constraints, and applying practical MapReduce performance tuning techniques—including baseline creation, counter analysis, combiner usage, compression, and proper Writable types—to achieve optimal big‑data processing efficiency.
This article provides a comprehensive tutorial on Kerberos fundamentals, its authentication workflow, and detailed procedures for installing, configuring, and enabling Kerberos security on a Cloudera (Hadoop) cluster running on CentOS, including code snippets, configuration files, and post‑deployment testing steps.
The article explains how HBase tracks each region's lifecycle states in hbase:meta and ZooKeeper, lists all possible states with their color codes, and describes the master‑region server interactions for opening, closing, splitting, and merging regions.
The article explains how Apache Hudi enables near‑real‑time data ingestion from various sources, supports low‑latency analytics, provides incremental processing pipelines, and simplifies data distribution on Hadoop, improving efficiency and reducing operational complexity.
This article provides a comprehensive step‑by‑step guide for installing Apache Kylin on a single machine, covering required software versions, environment variable configuration, Spark dependency handling, main Kylin properties, verification steps, and detailed solutions to common errors such as Zookeeper host issues, HTTP 404, Jackson conflicts, MapReduce jobhistory problems, missing Spark classes, HiveConf errors, and YARN shuffle service configuration.
This article explains the underlying principles of Hadoop HDFS read and write operations, detailing how the client interacts with NameNode and DataNodes, the role of FsDataInputStream and FsDataOutputStream, block location retrieval, pipeline replication, and file closure steps.
This article explains how Apache Hudi provides an incremental processing framework that enables efficient, low‑latency data ingestion, storage, and query capabilities on Hadoop, detailing its architecture, storage layout, compaction, write and read paths, and support for real‑time and batch analytics.
In this article, senior Alibaba engineer Zheng Kai analyzes Ozone’s role in the Hadoop ecosystem, arguing that despite its usefulness, Ozone cannot solve Hadoop’s core challenges of complexity, cost, and performance, and that Hadoop must focus on storage innovation, compute‑storage separation, and cloud integration to stay relevant.
This article provides a comprehensive, hands‑on tutorial for preparing three VMs, installing JDK and Hadoop, configuring core‑site.xml, hdfs‑site.xml, mapred‑site.xml, yarn‑site.xml, setting environment variables, distributing the package, starting HDFS and YARN, and verifying the cluster via web UI and jps commands.
This article provides a comprehensive introduction to HBase, covering its origins, key characteristics, architecture components, installation steps, basic shell commands for table management, data structures, read/write processes, and high‑availability configuration within the Hadoop ecosystem.
The article outlines a three‑dimensional framework—technical depth, ecosystem breadth, and evolution capability—to help professionals evaluate whether a technology is worth investing time in, illustrated with real‑world examples from Hadoop, Spark, and Flink.
This article provides a comprehensive overview of Hadoop Distributed File System (HDFS), covering its streaming data access model, key characteristics, master‑slave architecture, block storage and replication mechanisms, rack‑aware placement strategy, and how the NameNode manages metadata and checkpoints.
This article details Ctrip's Hadoop evolution, the challenges of expanding across multiple data centers, the evaluation of multi‑cluster versus single‑cluster designs, and the concrete architectural changes, migration tools, bandwidth monitoring, and future plans that enabled a stable cross‑datacenter big‑data platform.
This article explains the role of HDFS SecondaryNameNode, the structure of fsimage and edits files, how checkpointing works—including configuration parameters and steps—and how the process changes when NameNode high availability is enabled.
This article details how 58.com built a massive Hadoop‑based offline computing platform with over 4,000 servers and hundreds of petabytes of storage, addressing scaling, stability, GC, YARN scheduling, SparkSQL migration, storage operations, and a large‑scale cross‑datacenter migration.
The article explains how applying filters, projections, and predicate pushdown in Hadoop and Hive reduces data volume, speeds up MapReduce jobs, and improves performance, while also covering join limitations and providing a Java Mapper example for practical implementation.
The article chronicles Apache Kylin's evolution from an Apache incubator OLAP engine to a comprehensive analytical data warehouse, highlighting its five‑year growth, extensive enterprise adoption, core data‑warehouse features, and the community’s rebranding to better reflect its big‑data capabilities.
This article explains what data skew is in distributed big‑data systems like Spark and Hadoop, why it hurts performance, how to spot it using the Web UI or key statistics, and presents eight practical mitigation techniques ranging from filtering and shuffle parallelism to custom partitioners and broadcast joins.
This article introduces Apache Hudi, explains its architecture and storage models, describes how it enables upserts and incremental queries on Hadoop, provides step‑by‑step guidance for integrating Hudi with Apache Spark, and outlines best practices and comparisons with Apache Kudu.
This tutorial walks you through setting up a three‑node Hadoop 2.9.2 cluster on CentOS 7.5, covering environment preparation, password‑less SSH, user creation, JDK installation, Hadoop extraction, configuration file edits, directory setup, ownership changes, service startup, and verification via web UIs.
This article explains ZooKeeper’s architecture, key concepts such as roles, sessions, ZNodes, versioning, ACLs, and watchers, and demonstrates how it powers essential big‑data components like Hadoop’s ResourceManager and HBase’s master election, naming service, and distributed locking.
This article introduces Apache Ozone, a scalable distributed object storage system for Hadoop, covering its background, core components, design principles, architecture, deployment steps, configuration examples, and basic command‑line operations for managing volumes, buckets, and keys.
This article explains the purpose of data as a strategic asset, compares traditional databases with data warehouses, outlines key characteristics and related concepts of data warehouses, and introduces the Hadoop ecosystem components that support large‑scale data storage and analysis.
This article describes how eBay's Central Application Logging (CAL) system generates massive daily logs, the challenges of Hadoop MapReduce job performance and resource consumption, and the step‑by‑step optimizations—reducing GC time, mitigating data skew, and improving algorithms—that cut execution time by over 60%, lowered cluster resource usage, and raised job success rates to nearly 100%.
This article explains how Hadoop's MapReduce shuffle uses a circular buffer to store serialized key/value pairs and their metadata, detailing its structure, initialization, write path, spill logic, and the background thread that sorts and writes data to disk.
This article explains how Apache Hudi enables efficient, low‑latency incremental data ingestion and processing on Hadoop by providing a unified service layer, describing its motivation, architecture, storage components, write and read paths, compaction, fault recovery, and incremental query capabilities.
This article compiles 130 interview questions spanning big data technologies, distributed systems, and core computer science concepts to help candidates prepare for technical interviews, offering a comprehensive resource for self‑study and review.
The team performed a rolling upgrade of HDFS from 2.7 to 3.2 on large clusters, resolving EditLog, Fsimage, StringTable and authentication incompatibilities by omitting EC data, using fallback images, rolling back commits and first upgrading to the latest 2.x release, following a staged JournalNode‑NameNode‑DataNode procedure, validating with rehearsals and a custom trash‑management tool, and achieving uninterrupted service, improved stability, performance and cost efficiency.
This article walks through the full‑stack process of migrating and compiling the CDH Hadoop distribution on Kunpeng cloud servers, covering environment setup, dependency installation, source code adjustments, common build errors, and final packaging for a production‑ready big‑data platform.
Youzan’s evolution of HBase bulk‑load—from manual MapReduce jobs to Hive‑SQL and finally Spark—demonstrates how generating HFiles on HDFS, partitioning by region, sorting keys, and handling serialization issues enables billions of records to be loaded efficiently without disrupting production clusters.
Data skew, a common challenge in large-scale data processing where uneven key distribution leads to performance bottlenecks, is explored with examples from Hadoop, Spark, and Flink, alongside practical mitigation techniques such as hotspot key redesign, map‑side joins, and tuning framework parameters.
This article examines the big‑data architectures of three leading Chinese internet companies—Taobao, Meituan, and Didi—detailing their data sources, synchronization mechanisms, batch and streaming processing layers, and the common scheduling components that unify their Hadoop‑based ecosystems.
This article examines the challenges of selecting an IoT big‑data platform, compares traditional real‑time databases, Hadoop‑based solutions, and modern time‑series databases such as TDengine, InfluxDB and ClickHouse, and provides practical case studies and criteria for making an informed choice.
