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What is the difference between chaincode, transaction, and block events?
In Hyperledger Fabric, chaincode events, transaction events, and block events serve different purposes and are emitted differently. Chaincode events must be explicitly programmed into the smart contract. Developers need to use the setEvent method within the chaincode to emit custom events that applications can listen to. On the other hand, transaction and block events are generated by the system automatically. These events notify listening applications of new blocks added to the chain or transactions included in blocks, without requiring any additional programming effort within the smart contracts.
Which directory is created by the idemixgen tool along with the ca directory and msp directory when configuring membership?
Which ordering does Pluggable Consensus support for Hyperledger Fabric?
Hyperledger Fabric supports pluggable consensus mechanisms that allow the system to be tailored to specific trust assumptions of a deployment. The platform allows for the implementation of various consensus protocols, including Crash Fault Tolerant (CFT) and Byzantine Fault Tolerant (BFT). However, the specific support for only CFT or BFT would depend on the implementation choice within the context of the deployment's trust model. Fabric's modular architecture supports well-established consensus protocols for both CFT and BFT .
What is the main purpose of certificates in Hyperledger Fabric?
In Hyperledger Fabric, certificates primarily provide identity for various actors within the network, such as peers, orderers, and clients. These certificates facilitate not just node-to-node communication and data integrity but also contribute significantly to the security measures of the network, such as authentication and authorization processes. Importantly, these certificates are utilized in TLS (Transport Layer Security) protocols to secure communications between nodes on the network. Fabric utilizes X.509 certificates for these purposes, which are issued by a Certificate Authority (CA) within the network .
What is the only way to recover from a failed migration from Kafka to Raft?
Recovering from a failed migration from Kafka to Raft in Hyperledger Fabric involves restoring the state from a backup. This is necessary because once the ordering service is migrated to Raft and begins committing transactions, reverting to Kafka is not supported without a previous backup. If a migration is botched, and a backup was made at the appropriate point, administrators can roll back to this backup to restore the system to its pre-migration state .
