add log abstraction to store records in disk#15

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hongchaodeng wants to merge 5 commits into

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Commits on Nov 4, 2014

add log abstraction to store records in disk
Hongchao Deng
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remove Rev field in record
Hongchao Deng
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Commits on Nov 5, 2014

nit: log error check
Hongchao Deng
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Commits on Nov 6, 2014

close file in Destroy()
Hongchao Deng
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Commits on Nov 8, 2014

add log init and restore
Hongchao Deng
committed