Nico Kruber created FLINK-5651:
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Summary: state backends: forbid Iterator#remove() from the
Iterable returned by HeapListState#get()
Key: FLINK-5651
URL: https://issues.apache.org/jira/browse/FLINK-5651
Project: Flink
Issue Type: Improvement
Components: State Backends, Checkpointing
Affects Versions: 1.2.0
Reporter: Nico Kruber
Assignee: Nico Kruber
The idiom behind AppendingState#get() is to return a copy of the value behind
or at least not to allow changes to the underlying state storage. However, the
heap state backend returns the original list and thus is prone to changes.
The returned Iterable offers Iterable#iterator() which in turn offers
Iterator#remove() that would change the stored state. While we cannot
efficiently block the user from modifying the objects in the list, we can at
least prevent him from doing structural changes to the list by forbidding
Iterator#remove() there.
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