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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323603#comment-15323603
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Andrew Wang commented on HDFS-9924:
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[~vgumashta] and [~ashutoshc] thanks for joining the discussion. Since we have
you here, could you comment on the alternative of using a threadpool for this
usecase in Hive? It seems far more maintainable than us committing a private
API you'd need to hardcode against, especially an API that we are already
planning to change. Threads in Java are pretty cheap, and the calls are likely
network/NN bound anyway.
Our other downstream users are pushing for a callback API, so if the
Future-based API is solving a problem unique to Hive, I'm curious what was
already tried on the Hive side. Even if a threadpool is less optimal, it might
tide you over until the callback API is ready (which would make everyone happy).
> [umbrella] Asynchronous HDFS Access
> -----------------------------------
>
> Key: HDFS-9924
> URL: https://issues.apache.org/jira/browse/HDFS-9924
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: fs
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Xiaobing Zhou
> Attachments: AsyncHdfs20160510.pdf
>
>
> This is an umbrella JIRA for supporting Asynchronous HDFS Access.
> Currently, all the API methods are blocking calls -- the caller is blocked
> until the method returns. It is very slow if a client makes a large number
> of independent calls in a single thread since each call has to wait until the
> previous call is finished. It is inefficient if a client needs to create a
> large number of threads to invoke the calls.
> We propose adding a new API to support asynchronous calls, i.e. the caller is
> not blocked. The methods in the new API immediately return a Java Future
> object. The return value can be obtained by the usual Future.get() method.
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