Github user sihuazhou commented on the issue:
https://github.com/apache/flink/pull/5979
@StephanEwen , I had a micro-benchmark, here is the result
```
---------> Batch VS Put <------------
BATCH: end insert - duration:255
PUT: end insert - duration:545
---------> MapState#Clear New VS Old <------------
---->
NEW: end delete 50 records - duration:1077719
OLD: end delete 50 records - duration:10949887
---->
NEW: end delete 100 records - duration:809182
OLD: end delete 100 records - duration:1617317
---->
NEW: end delete 200 records - duration:1970156
OLD: end delete 200 records - duration:2731749
---->
NEW: end delete 400 records - duration:2492822
OLD: end delete 400 records - duration:13894767
---->
NEW: end delete 800 records - duration:5816919
OLD: end delete 800 records - duration:13017591
```
I tested two things:
- To compare the performance between `WriteBatch()` VS `Put()`
- To compare the performance of the `RocsDBMapState#Clear()`: new version
vs old version
In general, the more records there, the more lift we would get from the new
version, here is my code for the test:
https://github.com/sihuazhou/flink/commit/75504ad6fdb33755cccef43935e007bd5804ea9d
---
