Sihua Zhou created FLINK-9373:
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Summary: 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
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 _iterator.isValid()_ may also cause by a 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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