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Overview

Last updated: 2022-09-14 14:47:58

    Metadata acceleration is a high-performance file system feature offered by COS. Metadata acceleration leverages the powerful metadata management feature of Cloud HDFS (CHDFS) at the underlying layer to allow you to access COS over file system semantics. The system design metrics can reach a bandwidth of up to 2.4 GB/s, over 100,000 queries per second (QPS), and a latency of milliseconds. Buckets with metadata acceleration enabled can be widely used in scenarios such as big data, high-performance computing, machine learning, and AI.

    If you haven't enabled metadata acceleration for a bucket, it cannot accelerate metadata access by default and does not support access over POSIX file semantics, making it less favorable in terms of file LIST and unable to support RENAME. After enabling metadata acceleration, you can use POSIX file semantics to access objects in buckets through native COS APIs, the Hadoop tool deployed on the client side, the console, or SDKs.

    Note:

    Metadata acceleration can only be enabled upon bucket creation and cannot be disabled afterwards. Think twice before enabling it.

    Use Limits

    The following table compares the supported product features before and after metadata acceleration is enabled:

    Metric Metadata Acceleration Enabled Metadata Acceleration Disabled
    Bucket creation/query/deletion Supported Supported
    Object upload/download/deletion Supported Supported
    Bucket permissions Supported Supported
    Object permissions Inheriting bucket permissions by default Supported
    Intra-region disaster recovery Supported Supported
    Bucket encryption N/A Supported
    Object encryption N/A Supported
    CORS N/A Supported
    Hotlink protection N/A Supported
    Versioning N/A Supported
    Cross-bucket replication N/A Supported
    Static website N/A Supported
    Origin-pull settings N/A Supported
    Lifecycle Supported Supported
    Inventory N/A Supported
    Bucket tag N/A Supported
    COS Select N/A Supported
    COS Batch N/A Supported
    CI N/A Supported

    Billing

    Currently, metadata acceleration is in free beta test. If billing is required in the future, we will notify you by Message Center, email, or SMS. You can check the Message Center or see Billing Overview to stay up to date with the latest billing plan.

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