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https://issues.apache.org/jira/browse/HADOOP-19516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Masatake Iwasaki resolved HADOOP-19516.
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Assignee: Steve Loughran
Resolution: Fixed
> S3A: SDK reads content twice during PUT to S3 Express store.
> ------------------------------------------------------------
>
> Key: HADOOP-19516
> URL: https://issues.apache.org/jira/browse/HADOOP-19516
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 3.4.1, 3.4.2
> Environment: client in uK talking to s3 express ucket in us-w-2
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Fix For: 3.5.0, 3.4.2
>
>
> The commit on trunk {{60c7d4fea010}} and on branch 3.4 {{f3ec55b}} fixes the
> logging, but does not
> address the underlying issue.
> h2. problem
> During PUT calls, even of 0 byte objects, our UploadContentProver is
> reporting a recreation of
> of the input stream of an UploadContentProvider, as seen by our logging at
> info of this happening
> {code}
> bin/hadoop fs -touchz $v3/4
> 2025-03-26 13:38:53,377 [main] INFO impl.UploadContentProviders
> (UploadContentProviders.java:newStream(289)) - Stream recreated:
> FileWithOffsetContentProvider{file=/tmp/hadoop-stevel/s3a/s3ablock-0001-659277820991634509.tmp,
> offset=0} BaseContentProvider{size=0, initiated at 2025-03-26T13:38:53.355,
> streamCreationCount=2, currentStream=null}
> {code}
> This code was added in HADOOP-19221, S3A: Unable to recover from failure of
> multipart block upload attempt "Status Code: 400; Error Code:
> RequestTimeout"; it logs at INFO because it is considered both rare and
> serious enough that we should log it, based on our hypothesis that it was
> triggered by a transient failure of the S3 service front and and the
> inability of the SDK to recover from it
> It turns out that uploading even a zero byte file to S3 triggers the dual
> creation of the stream, apparently from a dual signing.
> This *does not* happen on multipart uploads.
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