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https://issues.apache.org/jira/browse/HDFS-13713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16635374#comment-16635374
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Ewan Higgs commented on HDFS-13713:
-----------------------------------
{quote}Either the MPU rejects a second attempt to write to the destination
(which the filesystem one now does){quote}
>From a contract perspective, this should overwrite.
{quote}Fix up FileSystemMultipartUploader to detect concurrent uploads and fail
(it just looks for the completion dir & rejects if it exists){quote}
This should succeed.
{quote}New test for concurrent uploads and ordering of visibility (eventually
the last upload committed will be come and remain the final file){quote}
+1
{quote}n TestHDFSContractMultipartUploader.testUploadEmptyBlock() expect a
failure, downgrade to WARN and skip(). This will need fixing in 3.3; for now
just skip that test. See HDFS-13936{quote}
+1
> Add specification of Multipart Upload API to FS specification, with contract
> tests
> ----------------------------------------------------------------------------------
>
> Key: HDFS-13713
> URL: https://issues.apache.org/jira/browse/HDFS-13713
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: fs, test
> Affects Versions: 3.2.0
> Reporter: Steve Loughran
> Assignee: Ewan Higgs
> Priority: Blocker
> Attachments: HADOOP-13713-004.patch, HADOOP-13713-004.patch,
> HADOOP-13713-005.patch, HADOOP-13713-006.patch, HADOOP-13713-007.patch,
> HDFS-13713.001.patch, HDFS-13713.002.patch, HDFS-13713.003.patch,
> multipartuploader.md
>
>
> There's nothing in the FS spec covering the new API. Add it in a new .md file
> * add FS model with the notion of a function mapping (uploadID -> Upload),
> the operations (list, commit, abort). The [TLA+
> mode|https://issues.apache.org/jira/secure/attachment/12865161/objectstore.pdf]l
> of HADOOP-13786 shows how to do this.
> * Contract tests of not just the successful path, but all the invalid ones.
> * implementations of the contract tests of all FSs which support the new API.
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