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I'm getting this error when I run a DataSync task:

Transfer and verification completed. There were some errors in your task execution. See a list of affected files in CloudWatch logs. If no files are listed in CloudWatch logs, contact AWS Support.

The error code is:

CompleteWithErrorLogsWithNoVerificationErrorTaskReports

The error happens during the prepare phase.

I have no idea how to further debug this or what could cause this to happen. The task stopped working randomly; it might be a temporary bug.

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  • For more information, I'm moving files from an S3 bucket to an EFS volume. The task worked before.
    – Yazeed Sabri
    Commented Feb 28, 2024 at 23:27

1 Answer 1

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After contacting AWS Support, they got back to us with an answer.

In the S3 bucket we had a path as such:

s3://<BUCKET_NAME>//test/path/file.txt

DataSync didn't like the double slash since it's not valid in most file systems. So, after renaming the bad path, everything worked.

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  • Hi there I am having the same issue with DataSync. Can I please ask how did you go about checking all paths in your bucket so I can look for double shlashes? Did you go with the CLI? Thanks.
    – Estrobelai
    Commented Jul 1, 2024 at 11:11
  • @Estrobelai you can list an S3 directory then programmatically look for the bad path. The support people told us which ones caused it, we also didn't have many files on our test env. We used double slashes while uploading the S3 file, S3 created empty directories for those slashes.
    – Yazeed Sabri
    Commented Jul 2, 2024 at 0:30
  • Is there any way to find that issue? Or I must pay for the support plan to ask AWS guys to look inside their logs
    – Andrey Zentavr
    Commented Dec 21, 2024 at 21:58
  • @AndreyZentavr Not as far as I know from when I did this 9 months ago.
    – Yazeed Sabri
    Commented Dec 24, 2024 at 2:03

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