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Object Storage Service
Object Storage Service

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      Help Center/ Object Storage Service/ SDK Reference/ Java/ Object Upload (SDK for Java)/ Multipart Upload (SDK for Java)/ Multipart Upload Overview (SDK for Java)

      Multipart Upload Overview (SDK for Java)

      Updated on 2024-01-16 GMT+08:00
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      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:

      1. Initiate a multipart upload (ObsClient.initiateMultipartUpload).
      2. Upload parts one by one or concurrently (ObsClient.uploadPart).
      3. Assemble parts (ObsClient.completeMultipartUpload) or abort the multipart upload (ObsClient.abortMultipartUpload).
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