James Clampffer created HDFS-11884:
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Summary: libhdfs++: Make use of socket wrappers consistent
Key: HDFS-11884
URL: https://issues.apache.org/jira/browse/HDFS-11884
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: James Clampffer
Assignee: James Clampffer
Different areas of the code alternate between hdfs::async_stream (and
derivatives) and the more direct asio::ip::tcp::socket. I propose getting the
code to consistently do socket IO through the async_stream style classes.
-async_stream's async_read and async_write are virtual so we can get rid of
classes that template the socket type to support trait injection for mock tests
-async_stream can have debug info attached to it e.g. a human readable host and
port. Extra info about status of the stream clears the way for implementing a
DN connection cache + bookkeeping how many sockets are in use.
-gives a chance to have a mutex serialize read and write operations. Not
needed in current use cases but can be used to assert that there aren't
concurrent reads and writes to the same socket happening unintentionally
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