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From "Bob Hansen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10796) libhdfs++: rationalize ioservice interactions
Date Thu, 25 Aug 2016 14:17:20 GMT
Bob Hansen created HDFS-10796:
---------------------------------

             Summary: libhdfs++: rationalize ioservice interactions
                 Key: HDFS-10796
                 URL: https://issues.apache.org/jira/browse/HDFS-10796
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Bob Hansen


Firstly, we should be pulling the number of threads from options.io_threads (which should
default to std::thread::hardware_concurrency()).  The library should pass all tests always
with io_threads set to 1 or to <a very high number>

Secondly, we should have _a_ constructor where the consumer doesn't need to manage the IOService
explicitly, and the FileSystemImpl should create its own internally.

Since the FileSystem is defined as being for a particular user/identity, there is a valid
use case for the consumer to be constructing many FileSystem instances to represent many authenticated
users in the same process, but want to share resources (notably have a single io_service shared
amongst them all).  In this case, the consumer would want to own the IOService and pass the
same instance to multiple FileSystem instances.





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