Aliyun Object Storage Service

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This guide describes how to configure Aliyun OSS as Alluxio’s under storage system.

Aliyun Object Storage Service (OSS) is a massive, secure and highly reliable cloud storage service provided by Alibaba Cloud. OSS provides multiple storage classes to help you manage and reduce storage costs.

For more information about Aliyun OSS, please read its documentation


If you haven’t already, please see Prerequisites before you get started.

In preparation for using OSS with Alluxio:

<OSS_BUCKET> Create a a new bucket in the OSS console or use an existing bucket
<OSS_DIRECTORY> The directory you want to use in the bucket, either by creating a new directory or using an existing one
<OSS_ACCESS_KEY_ID> ID used to identify a user. See How to Obtain AccessKey Pair
<OSS_ACCESS_KEY_SECRET> Secret is used to verify the identify of the user. See How to Obtain AccessKey Pair
<OSS_ENDPOINT> Endpoints are the domain names that other services can use to access OSS. See Regions and OSS Endpoints in the Public Cloud

Basic Setup

To use Aliyun OSS as the UFS of Alluxio root mount point, you need to configure Alluxio to use under storage systems by modifying conf/ If it does not exist, create the configuration file from the template.

$ cp conf/ conf/

Specify an OSS bucket and directory as the underfs address by modifying conf/

For example, the under storage address can be oss://alluxio-bucket/ if you want to mount the whole bucket to Alluxio, or oss://alluxio-bucket/alluxio/data if only the directory /alluxio/data inside the oss bucket alluxio-bucket is mapped to Alluxio.


Specify credentials for Aliyun OSS access by adding the following properties in conf/


Running Alluxio Locally with Aliyun OSS

Once you have configured Alluxio to Aliyun OSS, try running Alluxio locally to see that everything works.

Advanced Setup

[Experimental] OSS multipart upload

The default upload method uploads one file completely from start to end in one go. We use multipart-upload method to upload one file by multiple parts, every part will be uploaded in one thread. It won’t generate any temporary files while uploading.

To enable OSS multipart upload, you need to modify conf/ to include:


There are other parameters you can specify in conf/ to make the process faster and better.

# Timeout for uploading part when using multipart upload.
# Thread pool size for OSS multipart upload.
# Multipart upload partition size for OSS. The default partition size is 64MB. 

Contributed by the Alluxio Community

Aliyun OSS UFS integration is contributed and maintained by the Alluxio community. The source code is located here. Feel free submit pull requests to improve the integration and update the documentation here if any information is missing or out of date.