rdblue commented on code in PR #4612:
URL: https://github.com/apache/iceberg/pull/4612#discussion_r857160120
##########
core/src/main/java/org/apache/iceberg/BaseRewriteManifests.java:
##########
@@ -257,7 +257,10 @@ private void validateDeletedManifests(Set<ManifestFile>
currentManifests) {
.filter(manifest -> !currentManifests.contains(manifest))
.findAny()
.ifPresent(manifest -> {
- throw new ValidationException("Manifest is missing: %s",
manifest.path());
+ throw new ValidationException("Cannot commit RewriteManifests; " +
+ "manifests that existed at the beginning of this rewrite
have already been removed by another " +
+ "operation. Manifest %s, which would be replaced by this
operation, has already been removed.",
+ manifest.path());
Review Comment:
I think this is too long to be an effective error message. I think your
intent is to tell the end user that something changed. But there isn't anything
that user can do besides retry the operation. I think the short message works
fine, but you could also extend it to "Manifest is missing: %s (table changed
concurrently)". That's more clear without being confusing or overly long.
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