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Status Future consideration
Workspace z/OS
Categories z/OSMF
Created by Guest
Created on Apr 21, 2025

RELATED IDEAS

Misleading e-tag mismatch after uploading to sequential data set

  1. Create a sequential data set with RECFM=VB. In this case I created a data set with my username (4 characters long) as the high-level qualifier: USER.TEST.PS

  2. Use the z/OSMF API endpoint to write to a data set (PUT request, /zosmf/restfiles/ds/<dataset-name> endpoint)

  3. Notice a successful response (204 No Content), take note of the e-tag returned from the initial upload in the response headers: 86C2A8... (rest omitted for brevity)

  4. Use the z/OSMF API endpoint to read the contents of this data set (GET request, /zosmf/restfiles/ds/<dataset-name> endpoint)

  5. Notice a successful response (200 OK), but the e-tag in the response header is different: 55B96C...

  6. Try to use the e-tag returned from step 2 for another write request by passing it as the value for the If-Match request header. The request fails with error 412 Precondition Failed instead of the expected, successful response (204 No Content).

  7. Now, try using the e-tag returned from step 5 for the If-Match request header. This write request is successful with status code 204.

I am unable to reproduce this with PDS members, but can consistently reproduce it with a sequential data set on my test system. It's possible that this issue also affects PDS members on certain systems.

Idea priority High

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