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https://issues.apache.org/jira/browse/FLINK-10267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16610569#comment-16610569
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ASF GitHub Bot commented on FLINK-10267:
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StefanRRichter commented on issue #6638: [FLINK-10267][State] Fix arbitrary
iterator access on RocksDBMapIterator
URL: https://github.com/apache/flink/pull/6638#issuecomment-420272898
Thanks for the contribution! Looks good for me as well 👍 Merging.
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> [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: 1.5.3, 1.6.0
> Reporter: Yun Tang
> Assignee: Yun Tang
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.6.1, 1.5.4
>
>
> Currently, RocksDBMapIterator would load 128 entries into local cacheEntries
> every time if needed. Both RocksDBMapIterator#next() and
> RocksDBMapIterator#hasNext() action might 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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