CrynetLogistics commented on pull request #18733:
URL: https://github.com/apache/flink/pull/18733#issuecomment-1040494925


   Thanks @dmvk , looks like the `.close()` is non-blocking from:
   
https://github.com/aws/aws-sdk-java-v2/blob/750f16463f4fe5d36139b410189cabba6d5ee5aa/http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/NettyNioAsyncHttpClient.java#L198
   
   I can also confirm this by adding a `Thread.sleep(100)` straight before the 
`System.out.println(X);` which removes any sdk/netty related threads from the 
thread dump.
   
   Please let me know if this alleviates your concerns.


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