Jian Zhang created HDFS-17552:
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Summary: [ARR] RPC client uses CompletableFuture to support
asynchronous operations.
Key: HDFS-17552
URL: https://issues.apache.org/jira/browse/HDFS-17552
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Jian Zhang
h3. Description
In the implementation of asynchronous Rpc.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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