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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278786#comment-15278786
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Tsz Wo Nicholas Sze commented on HDFS-9924:
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> 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. ...
The main changes (except the FileSystem API) required in HDFS and Commom are
already done. It is just some little changes since, as mentioned previously,
the underlying RPC mechanism is already supporting asynchronous calls. You
would easily find it out if you read the code in more details.
Anyway, I will post a design doc soon as mentioned before.
> [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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