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Cloud Object Storage

DokumentasiCloud Object StorageData Lake StorageMetadata AcceleratorMetadata Acceleration Overview

Metadata Acceleration Overview

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Terakhir diperbarui: 2026-10-14 09:57:52
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The metadata acceleration feature is a high-performance file system feature provided by Tencent Cloud Object Storage (COS). The metadata acceleration feature uses the excellent metadata management capabilities of Cloud HDFS (CHDFS) at its core, allowing users to access COS through file system semantics. The system is designed to achieve bandwidth of hundreds of GB/s, hundreds of thousands of QPS, and millisecond-level latency. After you enable the metadata acceleration feature for a bucket, the bucket can be widely used in scenarios such as big data, high-performance computing, machine learning, and AI.
Buckets without the metadata acceleration feature enabled have no metadata access acceleration by default, do not support access through POSIX file semantics, have bottlenecks in file LIST performance, and do not support file RENAME operations. After you enable the metadata acceleration feature, you can access files in a bucket through POSIX file semantics using the native COS API, or through Hadoop tools deployed on the client, the console, or SDKs.
Note:
The metadata acceleration feature can only be enabled when you create a bucket, and cannot be disabled after being enabled. Carefully consider whether to enable this feature based on your business requirements.
The metadata acceleration feature is currently in beta. To apply for beta access, please contact us. Note that if you need to perform a large number of reads and writes using COS semantics, we do not recommend enabling the metadata acceleration feature to ensure optimal performance.
The metadata acceleration feature does not enable ATime by default. If you want to use ATime, note that metadata acceleration cannot guarantee the accuracy of ATime updates. Therefore, features that depend on ATime (such as lifecycle management) may also be subject to this limitation, and you need to carefully evaluate the impact of ATime inaccuracy. If you have a strong dependency on ATime, you can use the log feature for analysis. If you still want to enable this feature after evaluation, please contact us.

Supported Region

The regions that currently support metadata acceleration buckets are as follows:
Chinese mainland: Beijing, Shanghai, Guangzhou, Nanjing, Chengdu, and Chongqing.
Hong Kong (China) and outside Chinese mainland: Hong Kong (China), Singapore, Tokyo, Japan, Jakarta, Indonesia, Bangkok, Thailand, Frankfurt, Germany, Silicon Valley, United States (US West), Virginia, United States (US East), and Sao Paulo, Brazil.

Use Limits

The following table lists the support status of related product features after the metadata acceleration feature is enabled for a bucket:
Metric
Metadata Acceleration Enabled
Metadata Acceleration Disabled
Bucket creation, query, and deletion operations
Supported
Note:
After you initiate a request to delete a metadata acceleration bucket, the backend marks the bucket as being deleted and performs the deletion operation asynchronously. The bucket remains visible until the deletion is complete. If you need to speed up the process, for example, to create a bucket with the same name immediately after deletion, please contact us.
Supported
Object upload/download/delete operations
Supported
Note:
Custom headers x-cos-meta-* are not supported currently.
Supported
Object listing operations
Supported
Note:
A metadata acceleration bucket supports only a directory as the prefix input parameter. When a listing is performed, it prints only the files at that level and does not recurse into subdirectories.
Supported
Bucket permissions
Supported
Supported
Object permissions
Inherits bucket permissions by default
Supported
Data retrieval
Only standard retrieval mode is supported
Supported
Intra-city disaster recovery
Supported
Supported
Bucket Encryption (encryption)
Supports SSE-COS
Supported
Object encryption
Supported
Supported
Cross-origin resource sharing (CORS)
Supported
Supported
Hotlink Protection
Not applicable
Supported
Versioning
Not applicable
Supported
Bucket replication
Not applicable
Supported
Static website
Not applicable
Supported
Origin-pull configuration
Not applicable
Supported
Lifecycle
Supported
Note:
The lifecycle behavior of a metadata acceleration bucket differs from that of a COS bucket. For details, see Metadata Acceleration Bucket Lifecycle. If you need to use lifecycle rules to delete files in .Trash, use HDFS Trash mode.
Supported
Recycle bin
Supports HDFS recycle bin mode and native recycle bin mode. For more information, see Recycle Bin Feature Introduction.
Supported
Data restoration
Only standard rehydration is supported.
Supported
Inventory
In public beta. To request access to the inventory feature, contact us.
Supported
Bucket tagging
Supported
Supported
Object tagging
Not applicable
Supported
COS Select
Not applicable
Supported
COS Batch
Not applicable
Supported
CI feature
Not applicable
Supported

Billing Overview



Topik sebelumnya: Getting StartedTopik selanjutnya: Create a Metadata Acceleration Bucket and Enable the HDFS Protocol

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