Confluent CCDAK Dumps Questions Answers

To isolate logs for a specific connector, you can configure a separate logger and appender in the Connect worker’s log4j.properties file, using the connector’s name as the logging context.

From Kafka Connect Logging Docs:

“Kafka Connect loggers use hierarchical logger names. You can configure per-connector log levels and output files by extending log4j.properties.”

A and C change verbosity but don’t separate logs.

D is false; targeted logging is possible.

According to the official Apache Kafka consumer semantics documentation, at-most-once delivery means that records may be lost but must never be processed more than once. To achieve this guarantee, a consumer must commit offsets before processing records. If the application crashes after committing but before processing, messages are skipped rather than reprocessed, which satisfies at-most-once semantics.

Option B correctly implements this pattern. It disables automatic offset commits (enable.auto.commit=false) and explicitly calls commitAsync() immediately after polling and before processing records. This ensures that offsets are advanced regardless of whether processing succeeds, eliminating the possibility of duplicate processing.

Option C represents at-least-once semantics, because offsets are committed after processing, which can lead to duplicates on failure. Options A and D rely on automatic commits or incorrect ordering and do not provide strict at-most-once guarantees.

The Kafka documentation explicitly states that manual offset management with commits before processing is required for at-most-once delivery.

Therefore, Option B is the best and officially documented configuration and code skeleton to avoid duplicate message processing.

To change the replication factor of an existing topic, you must perform a partition reassignment, because the replication factor is not directly modifiable via kafka-topics.sh. The kafka-reassign-partitions.sh tool is the official command-line utility to handle partition reassignments, including changing the replication factor.

This tool allows you to generate a reassignment JSON specifying new replica assignments per partition and then apply it.

From official documentation:

“To change the replication factor, use the kafka-reassign-partitions tool to assign the partitions to more or fewer brokers.”

Neither kafka-topics.sh nor kafka-reassign-topics.sh exists for this purpose, and kafka-recreate-topic.sh is not an official Kafka tool.