Bob Hansen created HDFS-10796:
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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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