[jira] [Created] (HADOOP-13605) Clean up FileSystem javadocs, logging; improve diagnostics on FS load

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created HADOOP-13605:
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             Summary: Clean up FileSystem javadocs, logging; improve diagnostics on FS load
                 Key: HADOOP-13605
                 URL: https://issues.apache.org/jira/browse/HADOOP-13605
             Project: Hadoop Common
          Issue Type: Improvement
          Components: fs
    Affects Versions: 2.8.0
            Reporter: Steve Loughran
            Assignee: Steve Loughran


We can't easily debug FS instantiation problems as there isn't much detail in what was going on.

We can add more logging, but cannot simply switch {{FileSystem.LOG}} to SLF4J —the class is used in too many places, including tests which cast it. Instead, add a new private SLF4J Logger, {{LOGGER}} and switch logging to it. 

While working in the base FileSystem class, take the opportunity to clean up javadocs and comments

# add the list of exceptions, including indicating which base classes throw UnsupportedOperationExceptions
# cut bits in the comments which are not true

The outcome of this patch is that IDEs shouldn't highlight most of the file as flawed in some way or another



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