jackylau created FLINK-14159:
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             Summary: flink rocksdb StreamCompressionDecorator not right
                 Key: FLINK-14159
                 URL: https://issues.apache.org/jira/browse/FLINK-14159
             Project: Flink
          Issue Type: Bug
          Components: Runtime / State Backends
    Affects Versions: 1.9.0
            Reporter: jackylau
             Fix For: 1.10.0


I think the current flink rocksdb StreamCompressionDecorator is not right 
calling method 

getCompressionDecorator(executionConfig) which defalut value is false.That is 
to say, current compression is none.But I find rocksdb  using 
{{options.compression}} to specify the compression to use. By default it is 
Snappy, which you can see here 
[https://github.com/facebook/rocksdb/wiki/RocksDB-Tuning-Guide]. And I use 
rocksdb tool sstdump to find it is indeed snappy compression.

So I think it should be return SnappyStreamCompressionDecorator.INSTANCE  
rather than getCompressionDecorator( executionConfig) 

Coud i commit a PR?



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