fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Maysam Yabandeh 88d8b2a2f5 WritePrepared Txn: Duplicate Keys, Txn Part ... Summary: This patch takes advantage of memtable being able to detect duplicate <key,seq> and returning TryAgain to handle duplicate keys in WritePrepared Txns. Through WriteBatchWithIndex's index it detects existence of at least a duplicate key in the write batch. If duplicate key was reported, it then pays the cost of counting the number of sub-patches by iterating over the write batch and pass it to DBImpl::Write. DB will make use of the provided batch_count to assign proper sequence numbers before sending them to the WAL. When later inserting the batch to the memtable, it increases the seq each time memtbale reports a duplicate (a sub-patch in our counting) and tries again. Closes https://github.com/facebook/rocksdb/pull/3455 Differential Revision: D6873699 Pulled By: maysamyabandeh fbshipit-source-id: db8487526c3a5dc1ddda0ea49f0f979b26ae648d		7 years ago
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rocksdb	WritePrepared Txn: Duplicate Keys, Txn Part	7 years ago