Github user HeartSaVioR commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21700#discussion_r201866279
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/execution/streaming/state/StateStoreSuite.scala
 ---
    @@ -64,6 +64,63 @@ class StateStoreSuite extends 
StateStoreSuiteBase[HDFSBackedStateStoreProvider]
         require(!StateStore.isMaintenanceRunning)
       }
     
    +  test("retaining only latest configured size of versions in memory") {
    --- End diff --
    
    It is fairly easy to check whether reading from cache or reading from file 
with 
https://github.com/apache/spark/pull/21469/commits/c9aada520889b87ace0886805910f0d56d099bd2
 in #21469 since it introduces metrics for cache hit and cache miss, but not 
easy to check in this PR itself.
    
    So I just rely on checking cache to ensure the data is correctly evicted 
and not available in cache as expected. Hope this is OK.
    
    Btw, I caught a silly bug while adding tests to cover your suggestion. 
Thanks!


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