ASF GitHub Bot commented on FLINK-9373:

Github user sihuazhou commented on the issue:

    cc @StefanRRichter 

> Always call RocksIterator.status() to check the internal error of RocksDB
> -------------------------------------------------------------------------
>                 Key: FLINK-9373
>                 URL: https://issues.apache.org/jira/browse/FLINK-9373
>             Project: Flink
>          Issue Type: Bug
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.5.0
>            Reporter: Sihua Zhou
>            Assignee: Sihua Zhou
>            Priority: Blocker
> Currently, when using RocksIterator we only use the _iterator.isValid()_ to 
> check whether we have reached the end of the iterator. But that is not 
> enough, if we refer to RocksDB's wiki 
> https://github.com/facebook/rocksdb/wiki/Iterator#error-handling we should 
> find that even if _iterator.isValid()=true_, there may also exist some 
> internal error. A safer way to use the _RocksIterator_ is to always call the 
> _iterator.status()_ to check the internal error of _RocksDB_. There is a case 
> from user email seems to lost data because of this 
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Missing-MapState-when-Timer-fires-after-restored-state-td20134.html

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