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https://issues.apache.org/jira/browse/HADOOP-15576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16566362#comment-16566362
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Steve Loughran commented on HADOOP-15576:
-----------------------------------------
Looks like cause is finishedWrite is setting len == 0, so FileStatus entry
added to S3Guard has len == 0, so open() returns a file of len 0, which then
maps to input stream length of 0 for a digest.
{code}
java.lang.AssertionError: length of
S3AFileStatus{path=s3a://hwdev-steve-new/test/testSingleUpload;
isDirectory=false; length=0; replication=1; blocksize=33554432;
modification_time=1533187186798; access_time=0; owner=stevel; group=stevel;
permission=rw-rw-rw-; isSymlink=false; hasAcl=false; isEncrypted=false;
isErasureCoded=false} isEmptyDirectory=FALSE
Expected :8388608
Actual :0
{code}
> S3A Multipart Uploader to work with S3Guard and encryption
> -----------------------------------------------------------
>
> Key: HADOOP-15576
> URL: https://issues.apache.org/jira/browse/HADOOP-15576
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.2
> Reporter: Steve Loughran
> Assignee: Ewan Higgs
> Priority: Blocker
> Attachments: HADOOP-15576.001.patch, HADOOP-15576.002.patch,
> HADOOP-15576.003.patch, HADOOP-15576.004.patch
>
>
> The new Multipart Uploader API of HDFS-13186 needs to work with S3Guard, with
> the tests to demonstrate this
> # move from low-level calls of S3A client to calls of WriteOperationHelper;
> adding any new methods are needed there.
> # Tests. the tests of HDFS-13713.
> # test execution, with -DS3Guard, -DAuth
> There isn't an S3A version of {{AbstractSystemMultipartUploaderTest}}, and
> even if there was, it might not show that S3Guard was bypassed, because
> there's no checks that listFiles/listStatus shows the newly committed files.
> Similarly, because MPU requests are initiated in S3AMultipartUploader,
> encryption settings are't picked up. Files being uploaded this way *are not
> being encrypted*
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