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https://issues.apache.org/jira/browse/HDFS-17552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17867906#comment-17867906
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ASF GitHub Bot commented on HDFS-17552:
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KeeProMise commented on code in PR #6888:
URL: https://github.com/apache/hadoop/pull/6888#discussion_r1687280654
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hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java:
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@@ -283,6 +326,7 @@ static class Call {
boolean done; // true when call is done
private final Object externalHandler;
private AlignmentContext alignmentContext;
+ private CompletableFuture<Object> completableFuture;
Review Comment:
@szetszwo Thank you for your suggestion. I have made some modifications
according to your suggestion. Please take a look again.
> [ARR] IPC 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
> Assignee: Jian Zhang
> Priority: Major
> Labels: pull-request-available
> Attachments: HDFS-17552.patch
>
>
> 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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