[jira] [Created] (HDFS-12831) HDFS throws FileNotFoundException on getFileBlockLocations(path-to-directory)

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

Steve Loughran created HDFS-12831:
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             Summary: HDFS throws FileNotFoundException on getFileBlockLocations(path-to-directory)
                 Key: HDFS-12831
                 URL: https://issues.apache.org/jira/browse/HDFS-12831
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.8.1
            Reporter: Steve Loughran


The HDFS implementation of {{getFileBlockLocations(path, offset, len)}} throws an exception if the path references a directory. 

The base implementation (and all other filesystems) just return an empty array, something implemented in {{getFileBlockLocations(filestatsus, offset, len)}}; something written up in filesystem.md as the correct behaviour. 

# has been shown to break things: SPARK-14959
# there's no contract tests for these APIs; shows up in HADOOP-15044. 
# even if this is considered a wontfix, it should raise something like {{PathIsDirectoryException}} rather than FNFE



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