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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15335420#comment-15335420
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stack commented on HDFS-9924:
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[~xiaobingo] Thanks for posting the compare. It helps. It looks like the
difference between 'async' and thread pool is negligible; 10% at the extreme.
Is that how you interpret the results? As per [~andrew.wang], would be
interested in what happens when less threads (especially as NN is set up with
300 handlers...); tendency seems to be the less threads you use, the better it
does. Thanks for the report.
> [umbrella] Nonblocking 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: Async-HDFS-Performance-Report.pdf, AsyncHdfs20160510.pdf
>
>
> This is an umbrella JIRA for supporting Nonblocking 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 nonblocking 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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