rdblue commented on code in PR #4464:
URL: https://github.com/apache/iceberg/pull/4464#discussion_r841276545
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core/src/main/java/org/apache/iceberg/BaseTransaction.java:
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@@ -437,6 +430,25 @@ private void commitSimpleTransaction() {
}
}
+ private void applyUpdates(TableOperations underlyingOps) {
+ if (base != underlyingOps.refresh()) {
+ TableMetadata oldBase = base;
+ // use refreshed the metadata
+ this.base = underlyingOps.current();
+ this.current = underlyingOps.current();
+ for (PendingUpdate update : updates) {
+ // re-commit each update in the chain to apply it and update current
+ try {
+ update.commit();
+ } catch (CommitFailedException e) {
+ // fallback to old base, so that it refreshes again on retry and
apply pending updates.
+ base = oldBase;
Review Comment:
@ajantha-bhat, if I understand correctly, this is happening:
1. The transaction fails to commit because of a concurrent update
2. The base is updated to the refreshed metadata to re-apply commits, but
one commit fails
3. The retry runs again but detects that base is the same as the refreshed
metadata, so the updates are not reapplied
4. Because the updates aren't reapplied, `commit` is called with the
refreshed base and the last inner commit to succeed
Is that right?
In that case, I think that the right thing to do is to avoid catching the
update's exception and throw it instead of retrying. If an update cannot be
re-committed we should fail immediately rather than resetting to the original
metadata to exhaust retries.
That is what we do in the REST catalog `CatalogHandlers`:
https://github.com/apache/iceberg/blob/master/core/src/main/java/org/apache/iceberg/rest/CatalogHandlers.java#L289-L294
I think that's a more correct fix.
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