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https://issues.apache.org/jira/browse/HDFS-9924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15334999#comment-15334999
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Arpit Agarwal commented on HDFS-9924:
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bq. You misrepresent, again. HBase ran for years with a workaround while
waiting on the behavior to show up in HDFS; i.e. the hbase project did not have
an 'interest' in 'avoid local nodes'; they required this behavior of the
filesystem and ran with a suboptimal hack until it showed up.
It is not a misrepresentation. The Hive team is also facing the same
alternatives of sub-optimal behavior vs. using a hack (thread-pools). You are
obsessing over the word 'interest'. Debating semantics just derails the
technical discussion so let's please keep the focus on the merits of the APIs.
> [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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