WritePrepared Txn: Rollback
Summary: Implement the rollback of WritePrepared txns. For each modified value, it reads the value before the txn and write it back. This would cancel out the effect of transaction. It also remove the rolled back txn from prepared heap. Closes https://github.com/facebook/rocksdb/pull/2946 Differential Revision: D5937575 Pulled By: maysamyabandeh fbshipit-source-id: a6d3c47f44db3729f44b287a80f97d08dc4e888d
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