dimas-b commented on code in PR #4646:
URL: https://github.com/apache/polaris/pull/4646#discussion_r3388924563
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runtime/service/src/main/java/org/apache/polaris/service/catalog/iceberg/IcebergCatalog.java:
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@@ -2494,10 +2495,14 @@ private void renameTableLike(
case BaseResult.ReturnStatus.ENTITY_NOT_FOUND:
throw new NotFoundException("Cannot rename %s to %s. %s does not
exist", from, to, from);
- // this is temporary. Should throw a special error that will be caught
and retried
+ // Transient concurrency conditions: surface as 503 so clients can
retry. We avoid 409
+ // here because the rename endpoint reserves 409 for "target already
exists" (handled by
+ // the ENTITY_ALREADY_EXISTS case above).
case BaseResult.ReturnStatus.TARGET_ENTITY_CONCURRENTLY_MODIFIED:
Review Comment:
`Retry-After` is optional in 429 responses, AFAIK. If we go with 429, I'd
think we should _not_ set `Retry-After` to indicate that the server is not
asking the client to back off, and the client is free to decide when to retry.
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