ahmedabu98 commented on code in PR #22138:
URL: https://github.com/apache/beam/pull/22138#discussion_r922299041


##########
sdks/java/extensions/google-cloud-platform-core/src/main/java/org/apache/beam/sdk/extensions/gcp/util/GcsUtil.java:
##########
@@ -897,6 +898,35 @@ public void onFailure(GoogleJsonError e, HttpHeaders 
responseHeaders) throws IOE
         } else {
           throw new FileNotFoundException(from.toString());
         }
+      } else if (e.getCode() == 403
+          && e.getErrors().size() == 1
+          && e.getErrors().get(0).getReason().equals("retentionPolicyNotMet")) 
{
+        List<StorageObjectOrIOException> srcAndDestObjects = 
getObjects(Arrays.asList(from, to));
+        if (srcAndDestObjects
+            .get(0)

Review Comment:
   We get `retentionPolicyNotMet` error when we prematurely (1) try to 
overwrite an existing file or (2) try to delete an existing file: 
https://cloud.google.com/storage/docs/bucket-lock#retention-policy
   
   Deletions are handled in a separate `onFailure()` method 
[here](https://github.com/apache/beam/blob/209daedff3e60f86188bc9e2d3e7e331e283373b/sdks/java/extensions/google-cloud-platform-core/src/main/java/org/apache/beam/sdk/extensions/gcp/util/GcsUtil.java#L815-L843),
 so at this point I believe we can assume both source and destination exist.



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