Initial HDFS Readers and Writers implementation.#12

Merged

tdas merged 10 commits intotdas:driver-hafrom

harishreedharan:hdfs-wal

Oct 2, 2014

Commits on Oct 1, 2014

Basic implementation of HDFS WAL.
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Make most methods in writer and reader thread-safe.
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Add a method to close files
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Add preconditions checks to ensure that the writer or reader has not closed the stream before doing any operations
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Making FileSegment a case class
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Making all HDFS Wal classes private to streaming
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Make close methods synchronized, to ensure close does not get called in the middle of a write
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Make the Sequential reader an Iterator. Rename all classes. Mark all assertOpen methods private.
harishreedharan
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Commits on Oct 2, 2014