[jira] [Created] (HIVE-13523) Fix connection leak in ORC RecordReader and refactor for unit testing

["Thomas Poepping (JIRA)" <ji...@apache.org>]

Thomas Poepping created HIVE-13523:
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             Summary: Fix connection leak in ORC RecordReader and refactor for unit testing
                 Key: HIVE-13523
                 URL: https://issues.apache.org/jira/browse/HIVE-13523
             Project: Hive
          Issue Type: Bug
          Components: ORC
    Affects Versions: 2.0.0
            Reporter: Thomas Poepping


In RecordReaderImpl, a MetadataReaderImpl object was being created (opening a file), but never closed, causing a leak. This change closes the Metadata object in RecordReaderImpl, and does substantial refactoring to make RecordReaderImpl testable:
 * Created DataReaderFactory and MetadataReaderFactory (plus default implementations) so that the create() methods can be mocked to verify that the objects are actually closed in RecordReaderImpl.close()
 * Created MetadataReaderProperties and DataReaderProperties to clean up argument lists, making code more readable
 * Created a builder() for RecordReaderImpl to make the code more readable
 * DataReader and MetadataReader now extend closeable (there was no reason for them not to in the first place) so I can use the guava Closer interface: http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/io/Closer.html
 * Use the Closer interface to guarantee that regardless of if either close() call fails, both will be attempted (preventing further potential leaks)
 * Create builders for MetadataReaderProperties, DataReaderProperties, and RecordReaderImpl to help with code readability



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