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In hyperledger fabric World State is the collection of variables containing the results of executed transactions . Is the world state persisted somewhere in disk or it will be in primary memory?
What if the peer was restarted?
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In Hyperledger Fabric, a ledger consists of two distinct, though related, parts – a world state and a blockchain. Each of these represents a set of facts about a set of business objects. Firstly, there's a world state – a database that holds current values of a set of ledger states.
We provide four commands to manage a chaincode's lifecycle: package , install , instantiate , and upgrade .
The ledger is comprised of a blockchain ('chain') to store the immutable, sequenced record in blocks, as well as a state database to maintain current state. There is one ledger per channel. Each peer maintains a copy of the ledger for each channel of which they are a member.
The world state is persisted to disk in each peer at /var/hyperledger/production. The hyperledger fabric makes use of Rocksdb as a persistent key value store to store/retrieve the world state. So even if the peer goes down, and is brought back up the world state will still be intact.
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