Jian Zhang created HADOOP-19235:
-----------------------------------

             Summary: IPC client uses CompletableFuture to support asynchronous 
operations.
                 Key: HADOOP-19235
                 URL: https://issues.apache.org/jira/browse/HADOOP-19235
             Project: Hadoop Common
          Issue Type: New Feature
          Components: common
            Reporter: Jian Zhang


h3. Description

In the implementation of asynchronous Ipc.client, the main methods used include 
HADOOP-13226, HDFS-10224, etc.

However, the existing implementation does not support `CompletableFuture`; 
instead, it relies on setting up callbacks, which can lead to the "callback 
hell" problem. Using `CompletableFuture` can better organize asynchronous 
callbacks. Therefore, on the basis of the existing implementation, by using 
`CompletableFuture`, once the `client.call` is completed, the asynchronous 
thread handles the response of this call without blocking the main thread.

 

*Test*

new UT  TestAsyncIPC#testAsyncCallWithCompletableFuture()



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