Master handles rollback exceptions#446

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lylei wants to merge 11 commits into

baidu:masterfrom

Commits on Oct 19, 2015

issue=#324 rollback write meta with defualt value first
lylei
committed

Commits on Oct 20, 2015

issue=#382 add rollback cases
lylei
committed

Commits on Oct 21, 2015

Commits on Oct 23, 2015

Commits on Nov 2, 2015

Commits on Nov 4, 2015