azure-sdk-for-java: [BUG] Random Blob Upload Errors for Moderate Workloads

Describe the bug Uploading files randomly fails when sequentially uploading 30 files. Largest file is 100 MB, some are 1-100MB, and some are less than 1MB. Error is always “Request body emitted ${n+1} bytes, more than the expected ${n} bytes.” Uploading all 30 files occasionally works, but typically not.

Exception or Stack Trace

2019-12-05 20:22:58 ERROR Managed to upload 17 files 
2019-12-05 20:22:58 ERROR com.azure.core.exception.UnexpectedLengthException: Request body emitted 7962674 bytes, more than the expected 7962673 bytes.
com.nielsen.redacted.InputUploadException: com.azure.core.exception.UnexpectedLengthException: Request body emitted 7962674 bytes, more than the expected 7962673 bytes.
	at com.nielsen.Redacted.method(Redacted.java:496)

To Reproduce Steps to reproduce the behavior:

1. SDK Versions: both 12.0.0 and 12.0.0-preview-4
2. Java 11, including containerized openjdk:11-jre-slim
3. Setup multiple InputStream (particularly, from a remote connection instead of file system).
4. Synchronously and sequentially invoke BlockBlobClient.upload(inputStream, size)

Code Snippet

if (contentStream.getSize() < TWO_HUNDRED_FORTY_MB) { // api limit is 256MB
				BlockBlobItem blobItem = blockBlobClient.upload(stream, contentStream.getSize());

Expected behavior Expected higher success rate; 95% would be fine. Observed rate is under 50%.

Screenshots N/A

Setup (please complete the following information):

• OS: [Linux]
• IDE : [IntelliJ]
• Version of the Library used: 12.0.0

Additional context Things are more reliable when using blockBlobClient.getBlobOutputStream(), but that is much slower, unless there’s a trick to using it with arbitrary input streams.

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