[jira] [Created] (FLINK-5917) Remove MapState.size()

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-5917:
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             Summary: Remove MapState.size()
                 Key: FLINK-5917
                 URL: https://issues.apache.org/jira/browse/FLINK-5917
             Project: Flink
          Issue Type: Improvement
          Components: DataStream API
    Affects Versions: 1.3.0
            Reporter: Aljoscha Krettek


I'm proposing to remove {{size()}} because it is a prohibitively expensive operation and users might not be aware of it. Instead of {{size()}} users can use an iterator over all mappings to determine the size, when doing this they will be aware of the fact that it is a costly operation.

Right now, {{size()}} is only costly on the RocksDB state backend but I think with future developments on the in-memory state backend it might also become an expensive operation there.



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