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

    https://github.com/apache/flink/pull/5239#discussion_r165308709
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/state/StateBackendTestBase.java
 ---
    @@ -3404,12 +3405,16 @@ public String fold(String acc, Integer value) 
throws Exception {
                }
        }
     
    -   protected KeyedStateHandle runSnapshot(RunnableFuture<KeyedStateHandle> 
snapshotRunnableFuture) throws Exception {
    +   protected KeyedStateHandle runSnapshot(
    +           RunnableFuture<SnapshotResult<KeyedStateHandle>> 
snapshotRunnableFuture) throws Exception {
    +
                if(!snapshotRunnableFuture.isDone()) {
                        Thread runner = new Thread(snapshotRunnableFuture);
                        runner.start();
                }
    -           return snapshotRunnableFuture.get();
    +
    +           SnapshotResult<KeyedStateHandle> snapshotResult = 
snapshotRunnableFuture.get();
    --- End diff --
    
    Why are we spawning a new `Thread` if we block the current thread here? 
Wouldn't it be better to simply call `run` on the `RunnableFuture` if it is not 
yet done?


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