curcur edited a comment on pull request #17462:
URL: https://github.com/apache/flink/pull/17462#issuecomment-968497357


   @rkhachatryan , Let's sync up offline?
   
   To answer the questions above:
   1. Why is the test single thread? Because the materialization is triggered 
**manually** from the main thread now, the mailbox executor is sycn mailbox and 
async pool is a direct executor. Now everything is executed in a single thread. 
This is easier to reason about for a unit test. I am writing a ITTest as well. 
So multi-thread will be tested in a separate ticket.
   
   2. For test, I mean `ChangelogDelegateHashMapTest.testMaterializedRestore`. 
You can compare against what has been changed on this test. As explained 
previously, now it includes both changelog + materiliazation part.
   
   If you still have questions, let's sync up offline.


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