Nishith Agarwal 5405a6287b Introducing HoodieLogFormat V2 with versioning support ...

- HoodieLogFormat V2 has support for LogFormat evolution through versioning
			- LogVersion is associated with a LogBlock not a LogFile
			- Based on a version for a LogBlock, approporiate code path is executed
		- Implemented LazyReading of Hoodie Log Blocks with Memory / IO tradeoff
		- Implemented Reverse pointer to be able to traverse the log in reverse
		- Introduce new MAGIC for backwards compatibility with logs without versions

2018-03-06 21:14:11 -08:00

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