Linux Foundation HFCP Dumps

In Hyperledger Fabric, an endorsement policy specifies which network participants, identified by their digital identities, must endorse a transaction before it can be considered valid. This is crucial for the network's security and integrity, as it controls how transactions are approved andadded to the ledger. Endorsement policies are part of the channel configuration and can be customized to fit the specific needs of a business network. They dictate the necessary endorsements from specific organizations or even particular roles within those organizations, ensuring that only authorized entities can validate transactions. This mechanism supports the collaborative yet secure nature of the enterprise blockchain, where trust is decentralized across different organizations that are part of the network​​.

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 .

In the RAFT ordering service within Hyperledger Fabric, the concept of the "Leader" is crucial for the ingestion of new log entries, their replication to other ordering nodes, and managing when an entry is considered committed. In a RAFT-based ordering service, the leader node is responsible for managing the log entries; it receives all client requests, appends them to its log, and replicates these logs to the follower nodes. The leader also plays a crucial role in ensuring that there is a consensus on the order of transactions before they are committed to the ledger. The leader is dynamically elected by the cluster nodes and can change due to network conditions or node failures. This role is pivotal in the RAFT consensus mechanism for maintaining a consistent and reliable ordering service​​.