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Date: Wed, 9 Mar 2016 01:49:40 +0000 (UTC)
From: "Tsz Wo Nicholas Sze (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.12948243.1457488146000.40756.1457488180775@Atlassian.JIRA>
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Subject: [jira] [Created] (HDFS-9924) [umbrella] Asynchronous HDFS Access
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Tsz Wo Nicholas Sze created HDFS-9924:
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             Summary: [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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