pvary commented on code in PR #14810:
URL: https://github.com/apache/iceberg/pull/14810#discussion_r2665342879
##########
flink/v2.0/flink/src/main/java/org/apache/iceberg/flink/sink/dynamic/DynamicCommitter.java:
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@@ -126,9 +125,14 @@ public void
commit(Collection<CommitRequest<DynamicCommittable>> commitRequests)
return;
}
- // For every table and every checkpoint, we store the list of
to-be-committed
- // DynamicCommittable.
- // There may be DynamicCommittable from previous checkpoints which have
not been committed yet.
+ /*
+ Each (table, branch, checkpoint) triplet must have only one commit
request.
+ There may be commit requests from previous checkpoints which have not
been committed yet.
+
+ We currently keep a List of commit requests per checkpoint instead of a
single CommitRequest<DynamicCommittable>
+ to process the Flink state from previous releases, which had multiple
commit requests due to a bug in the upstream
+ DynamicWriteResultAggregator. We should replace this with a single
commit request in the next major release.
Review Comment:
> > Could we change the uid for the committer somehow? If we could do it,
then we could enforce using a news state for the new committer.
>
> This wouldn't really improve the state migration process because there
will still be unmapped old state during migration.
It would cause a failure if the job is restarted without setting
`allowNonRestoredState`, which might prevent users accidentally forgetting to
set this config.
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