ClickHouse vs Hadoop for Real-time Analytics


This article highlights why Hadoop may not be the best fit for real-time analytics and discusses how ClickHouse emerges as a more suitable solution.

10 Reasons Why Hadoop is Not Recommended for Real-Time Analytics:

  1. Batch-Oriented Nature: Hadoop was designed for batch processing. Although tools like Apache Storm, Flink, or Kafka Streams can enable real-time processing on top of Hadoop, it is not inherently optimized for this purpose.
  2. Latency: Hadoop’s MapReduce paradigm is unsuitable for scenarios demanding low-latency responses, which are crucial for real-time analytics.
  3. Complex Ecosystem: Hadoop’s ecosystem is vast and can be complex to set up, maintain, and optimize for real-time analytics.
  4. Resource Intensiveness: Real-time data analytics require efficient resource utilization. Hadoop can be resource-intensive, particularly when handling large volumes of real-time data.
  5. Limited SQL Support: While tools like Hive offer SQL-like querying capabilities on Hadoop, they lack the speed and real-time capabilities offered by dedicated databases like ClickHouse.
  6. Data Ingestion: Hadoop can struggle with high-speed data ingestion rates common in real-time analytics scenarios.
  7. Scalability Concerns: While Hadoop scales well for batch processing, real-time data processing might require more immediate scaling, which can pose challenges.
  8. No Built-In Support for Stream Processing: Stream processing is crucial for real-time analytics, but Hadoop lacks built-in stream processing capabilities.
  9. Operational Complexity: Maintaining a Hadoop cluster, especially for real-time operations, requires significant expertise and can be operationally challenging.
  10. Cost: The infrastructure and operational costs can be high, especially when trying to retrofit Hadoop for real-time purposes.

Why ClickHouse is the Most Recommended ColumnStore for Real-Time Analytics

ClickHouse, a columnar database management system (DBMS), is purpose-built for real-time analytical queries. Here’s why it stands out:

  • Speed: ClickHouse is designed to deliver high-speed query results. Its columnar storage allows for faster I/O operations.
  • Scalability: It scales horizontally seamlessly, ensuring efficient data-intensive applications.
  • SQL Support: ClickHouse supports ANSI SQL, providing familiarity and ease for users.
  • Data Compression: Superior data compression capabilities enable quick analysis of large volumes of data.
  • Real-Time Stream Processing: ClickHouse handles real-time stream processing effectively, ensuring timely insights.
  • Open Source: Being open source, it offers flexibility and cost-effectiveness.
  • Integration Capabilities: ClickHouse can integrate well with popular data visualization tools, enhancing analytical capabilities.
  • Concurrent Users: It can handle multiple concurrent users, ensuring analytics is not bottlenecked.

By combining Hadoop’s robust batch processing with ClickHouse’s real-time analytical prowess, businesses can harness the best of both worlds, ensuring timely, efficient, and actionable insights from their data.


In today’s fast-paced digital world, real-time analytics have become imperative for businesses striving to stay ahead of the curve. While Hadoop once stood as a cornerstone in big data processing, its limitations in delivering real-time insights have become increasingly evident. Our examination revealed ten significant challenges associated with using Hadoop for real-time analytics, from its inherent batch processing nature to its lack of built-in columnar storage support.

ClickHouse, on the other hand, has emerged as a formidable solution tailored for real-time analytics. Its architecture, rooted in columnar storage design, enables fast query processing and efficient data compression, ensuring businesses can derive actionable insights swiftly. The capacity to handle petabytes of data, a proven track record in performance, and its adeptness in handling analytical workloads further solidify ClickHouse’s superiority in this arena.

In essence, for organizations aiming to tap into the full potential of real-time analytics and capitalize on immediate data-driven decisions, complementing or transitioning from Hadoop to ClickHouse isn’t just a recommendation—it’s a strategic imperative.

To know more about ClickHouse and Hadoop, do consider reading the following articles:

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About Shiv Iyer 225 Articles
Open Source Database Systems Engineer with a deep understanding of Optimizer Internals, Performance Engineering, Scalability and Data SRE. Shiv currently is the Founder, Investor, Board Member and CEO of multiple Database Systems Infrastructure Operations companies in the Transaction Processing Computing and ColumnStores ecosystem. He is also a frequent speaker in open source software conferences globally.