What types of events committed to the ledger can client applications receive using the peer's event service?
Answer(s): B
In Hyperledger Fabric, client applications can subscribe to receive both chaincode events and block events using the peer's event service. Chaincode events are generated by the chaincode itself, typically based on specific conditions coded within the chaincode operations, and are used to notify applications of specific state changes or significant occurrences. Block events inform about the addition of new blocks to the ledger, which may contain multiple transactions. This dual capability allows client applications to effectively monitor transaction confirmations and specific chaincode outputs in real time, which is critical for applications that rely on up-to-date blockchain data for processing decisions.
Which of the following is the correct role of orderer nodes?
Answer(s): A
The primary role of orderer nodes in Hyperledger Fabric is to order and package endorsed transactions into blocks. Orderers receive transactions from various peers, ensure that these transactions are in a consistent order, and then package them into blocks that are subsequently appended to the blockchain. This function is crucial for maintaining the consistency and integrity of the ledger across all participating nodes. Orderer nodes do not issue tokens, enforce peer endorsements, or reorder stored blocks for data compression. Instead, their main function is integral to the consensus and ledger maintenance processes within a Hyperledger Fabric network
What gRPC status code might you expect to be associated with an error invoking a transaction as a result of a transient failure, such as a network disconnection between the client application and Gateway peer?
The gRPC status code "UNAVAILABLE" is commonly expected in scenarios involving transient failures in network communication, such as a disconnection between the client application and the Gateway peer. This status code indicates that the service is currently unavailable, often due to network issues or service downtime, making it suitable for situations where the failure is temporary and the request can be retried. This differs from other codes like "ABORTED" or "DEADLINE EXCEEDED," which represent different types of errors related to the transaction logic or timing issues, respectively. "FAILED PRECONDITION" would be inappropriate for network disconnections as it suggests issues with the request's preconditions, not the network status.
In a production environment, what peer items require on-going monitoring?
Answer(s): C
In a production environment of Hyperledger Fabric, it is essential to monitor all peer containers comprehensively, including their CPU, network, and memory usage. This is because each peer node plays a critical role in maintaining the network's overall health and efficiency. Monitoring these resources helps in detecting potential bottlenecks or failures early, ensuring the smooth operation of the blockchain network. Focusing only on specific components like the orderer service or chaincode containers would provide a limited view of the network's health and could lead to issues being overlooked. Comprehensive monitoring enables administrators to maintain optimal performance and reliability across the entire network.
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PC commented on October 26, 2024 Good content Anonymous upvote
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