itsvikramagr commented on issue #24922: [SPARK-28120][SS] Rocksdb state storage implementation URL: https://github.com/apache/spark/pull/24922#issuecomment-510327508 @HeartSaVioR, @gaborgsomogyi - thanks again for such a thorough review. I will soon resolve all your comments. Meanwhile, I was doing the performance analysis for various use-cases. While for complete output mode, I was able to ingest 2x-3x data than memory based backend in 1 executor and 5G container memory setup, I was not seeing encouraging results when the outputMode was "Append". I found that there is some memory leak (similar to one reported [here](https://github.com/facebook/rocksdb/issues/3216)) I am digging deeper to find the root cause. It might be some rocksdb config tunning or falling back to use an older version of rocksdb. (As @skonto commented earlier, code path for deletion of older states might need refactoring to get best out of rocksdb)
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