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https://issues.apache.org/jira/browse/HADOOP-13057?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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He Tianyi resolved HADOOP-13057.
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Resolution: Duplicate
> Async IPC server support
> ------------------------
>
> Key: HADOOP-13057
> URL: https://issues.apache.org/jira/browse/HADOOP-13057
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 2.6.0
> Reporter: He Tianyi
>
> On some application, server may run out of handlers when performing many
> blocking I/O operations during processing of each call (e.g. calling another
> service, etc.). A viable solution is increasing number of handlers.
> But this faces the problem that large amount of threads will consume much
> memory (stack, etc.), and performance issues either.
> After HADOOP-12909, work on asynchronization has been done on caller-side.
> This is a similar proposal on server-side.
> Suggesting the ability to handle requests asynchronously.
> For example, in such server, calls may return a Future object instead of
> immediate value. Then sends response to client in {{onSuccess}} or
> {{onFailed}} callbacks.
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