Multipart Upload Overview (SDK for Java)
Function
You can upload large files using multipart upload. Multipart upload is applicable to many scenarios, including:
- Files to be uploaded are larger than 100 MB.
- The network condition is poor. Connection to the OBS server is constantly down.
- Sizes of files to be uploaded are uncertain.
A multipart upload has the following advantages:
- Higher throughput: You can upload parts in parallel to improve throughput.
- Quick recovery from network failures: Uploading an object in parts helps minimize the impact of upload interruptions caused by network failures.
- Flexible suspension and resumption of object uploads: You can upload parts at any time. A multipart upload will not expire after being initiated. You must explicitly complete or abort a multipart upload.
- No need to know the size before uploading an object: You can upload an object while creating it.
A multipart upload consists of the following steps:
- Initiate a multipart upload (ObsClient.initiateMultipartUpload).
- Upload parts one by one or concurrently (ObsClient.uploadPart).
- Assemble parts (ObsClient.completeMultipartUpload) or abort the multipart upload (ObsClient.abortMultipartUpload).
![](https://support.huaweicloud.com/intl/en-us/sdk-java-devg-obs/public_sys-resources/notice_3.0-en-us.png)
If you have any questions during development, post them on the Issues page of GitHub.
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