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DocumentaçãoCloud Object StorageData Lake StorageMetadata AcceleratorMetadata Acceleration Overview

Metadata Acceleration Overview

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Última atualização: 2024-03-25 16:04:01
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 100 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 with POSIX file semantics, making it less favorable in terms of file LIST and not support RENAME. After enabling metadata acceleration, you can use POSIX file semantics to access objects in buckets through native COS APIs or 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 once enabled. Think twice before enabling it.
The Metadata Acceleration feature is in public beta testing. Please contact us to Submit a ticket to join the beta test.

Use Limits

The following table compares the product feature support between enabling and not enabling metadata acceleration:
Metric
Metadata Acceleration Enabled
Metadata Acceleration Disabled
Creating/Querying/Deleting buckets
Supported
Supported
Uploading/Downloading/Deleting objects
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 Details

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.
Anterior: Getting StartedPróximo: Create a Metadata Acceleration Bucket and Enable the HDFS Protocol

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