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Druid Overview

Last updated: 2021-07-01 10:57:03

    Apache Druid is a distributed data processing system supporting real-time and multi-dimensional online analytical processing (OLAP). It is used to implement quick and interactive query and analysis for large data sets.

    Basic Characteristics

    Characteristics of Apache Druid:

    • It supports interactive queries with a subsecond response time and has various features such as multi-dimensional filtering, ad hoc attribute grouping, and quick data aggregation.
    • It supports highly concurrent and real-time data ingestion to ensure real-timeliness for data ingestion and query.
    • It features high scalability. With the distributed shared-nothing architecture, it supports quick processing of petabytes of data with hundreds of billions of events and sustains thousands of concurrent queries per second.
    • It allows simultaneous online queries by multiple tenants.
    • It supports high availability (HA) and rolling update.

    Use Cases

    Druid is most frequently used for flexible, quick, multi-dimensional OLAP analysis on big data. In addition, as it supports ingestion of pre-aggregated data and analysis of aggregated data based on timestamps, it is usually used in time-series data processing and analysis, such as ad platform, real-time metric monitoring, recommendation model, and search model.

    System and Architecture

    Druid uses a microservice-based architecture. All core services in it can be deployed on different hardware devices either separately or jointly.

    Enhanced EMR Druid
    A lot of improvements have been made on EMR Druid based on Apache Druid, including integration with EMR Hadoop and relevant Tencent Cloud ecosystem, convenient monitoring and OPS, and easy-to-use product APIs, so that you can use it out of the box in an OPS-free manner.

    Currently, EMR Druid supports the following features:

    • Easy integration with EMR Hadoop cluster
    • Easy and quick elastic scalability
    • HA
    • Using COS as deep storage
    • Using COS file as data source for batch indexing
    • Metadata storage in TencentDB
    • Integration with tools such as Superset
    • Various monitoring metrics and alarm rules
    • Failover
    • High security
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