[jira] [Created] (FLINK-8639) Fix always need to seek multiple times when iterator RocksDBMapState

[Shang Yuanchun (Jira)]

Sihua Zhou created FLINK-8639:
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             Summary: Fix always need to seek multiple times when iterator RocksDBMapState
                 Key: FLINK-8639
                 URL: https://issues.apache.org/jira/browse/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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