Performance Monitoring & Optimization Flashcards
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Read the first 7 Performance Monitoring & Optimization flashcards as text
What does the orderer BatchTimeout setting control?
Answer: Maximum time to wait after the first transaction before cutting a block
BatchTimeout is the maximum wait before a block is cut when batch size limits are not yet reached.
Which setting caps the number of transactions in a single block?
Answer: MaxMessageCount
MaxMessageCount is the maximum number of messages per batch.
A channel has low load and users complain about high commit latency. Which tuning change is most likely to help?
Answer: Lower BatchTimeout, such as to 500ms
At low load blocks are cut by timeout, so a shorter BatchTimeout cuts them sooner.
What is PreferredMaxBytes used for in batch configuration?
Answer: It is the target block size, and a larger message gets its own block
PreferredMaxBytes is the preferred batch size; a message exceeding it is placed in its own batch.
A Raft ordering cluster across distant regions shows frequent leader elections. What is a sensible fix?
Answer: Increase TickInterval or ElectionTick to tolerate network latency
Longer Raft tick or election timeouts avoid spurious elections caused by high network latency.
What is the typical trade-off of increasing block size (MaxMessageCount) substantially?
Answer: Higher throughput potential but higher per-transaction latency
Larger batches amortize overhead for throughput but make transactions wait longer for the block to fill or time out.
Which orderer limit rejects any single transaction larger than a set size?
Answer: AbsoluteMaxBytes
AbsoluteMaxBytes is the hard upper bound on the serialized size of messages in a batch.
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