Performance Monitoring & Optimization Flashcards

How does choosing a MAJORITY endorsement policy instead of AND across all orgs affect performance?

Answer: It requires fewer endorsements, cutting latency and failure risk

Fewer required endorsers means fewer round trips and tolerance of an unavailable org.

What advantage does the Fabric Gateway service (v2.4+) bring to client applications?

Answer: Peers handle endorsement routing and submission, simplifying and lightening the client

The Gateway offloads endorsement orchestration and submission to the peer, reducing client SDK work.

What is a recommended client-side practice for higher throughput?

Answer: Reuse long-lived gateway or gRPC connections

Reusing connections avoids repeated connection setup costs, and submitting asynchronously increases concurrency.

How do private data collections affect data dissemination?

Answer: Private data goes only to authorized peers, and only a hash is placed on the channel ledger

Private data is gossiped only to collection members, with a hash recorded in the block.

What does the validation code MVCC_READ_CONFLICT indicate?

Answer: A key read by the transaction was changed by an earlier transaction before commit

The read-set version no longer matched the committed state version at validation time.

What is the benefit of Fabric ledger snapshots (v2.3+) for a new peer joining a channel?

Answer: It can join from a snapshot instead of replaying all blocks from genesis

Joining by snapshot avoids processing the full block history, shortening time to be operational.

Which gossip setting lets an organization's peers pull blocks from the orderer efficiently by electing one peer for that role?

Answer: gossip.useLeaderElection

With useLeaderElection, peers elect a leader that pulls blocks from the orderer and distributes them to the others.