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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278651#comment-15278651
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Colin Patrick McCabe commented on HDFS-9924:
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Hi all,
I am +1 for doing this work, based on possible performance improvements we
might see, and the need for a convenient asynchronous API for applications.
However, I am concerned that there has been no design doc posted, but already
code committed to trunk. I am -1 on committing anything more to trunk until we
have a design document explaining how the API will work and what changes it
will require in HDFS. Just to clarify, I would be fine on committing code to a
feature branch without a design document, since we can review it later prior to
the merge. However, it is concerning to see such a large feature proceed on
trunk without either a branch or a design that the community can review.
> [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
>
> 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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