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Posted to hdfs-dev@hadoop.apache.org by "Tsz Wo Nicholas Sze (JIRA)" <ji...@apache.org> on 2016/03/09 02:49:40 UTC
[jira] [Created] (HDFS-9924) [umbrella] Asynchronous HDFS Access
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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