Yun Tang created FLINK-10267:
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Summary: [State] Fix arbitrary iterator access on
RocksDBMapIterator
Key: FLINK-10267
URL: https://issues.apache.org/jira/browse/FLINK-10267
Project: Flink
Issue Type: Bug
Components: State Backends, Checkpointing
Affects Versions: 1.6.0, 1.5.3
Reporter: Yun Tang
Assignee: Yun Tang
Fix For: 1.6.1, 1.5.4
Currently, RocksDBMapIterator would load 128 entries into local cacheEntries.
Both RocksDBMapIterator#next() and RocksDBMapIterator#hasNext() action would
trigger to load RocksDBEntry into cacheEntries.
However, if the iterator's size larger than 128 and we continue to access the
iterator with following order: hasNext() -> next() -> hasNext() -> remove(), we
would meet weird exception when we try to remove the 128th element:
{code:java}
java.lang.IllegalStateException: The remove operation must be called after a
valid next operation.
{code}
Since we could not control user's access on iterator, we should fix this bug to
avoid unexpected exception.
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