liming30 commented on code in PR #21503:
URL: https://github.com/apache/flink/pull/21503#discussion_r1104495068


##########
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java:
##########
@@ -417,7 +420,12 @@ protected StreamTask(
             this.asyncExceptionHandler = new 
StreamTaskAsyncExceptionHandler(environment);
 
             this.asyncOperationsThreadPool =
-                    Executors.newCachedThreadPool(
+                    new ThreadPoolExecutor(
+                            0,
+                            configuration.getMaxConcurrentCheckpoints() + 1,

Review Comment:
   Thanks a lot for your help, the code has been resubmitted. There are some 
unknown errors in CI, which don't seem to be related to my modification, do I 
need to fix it? 
https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_apis/build/builds/46049/logs/211



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