Sihua Zhou created FLINK-8639:

             Summary: Fix always need to seek multiple times when iterator 
                 Key: FLINK-8639
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing
    Affects Versions: 1.4.0
            Reporter: Sihua Zhou
            Assignee: Sihua Zhou
             Fix For: 1.5.0

Currently, almost every time we want to iterator a RocksDBMapState we need to 
do seek at least 2 times (Seek is a poor performance action for rocksdb cause 
it can't use the bloomfilter). This is because `RocksDBMapIterator` use a 
`cacheEntries` to cache the seek values every time and the `cacheEntries`'s 
init size is 1.

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