kafka.env

# This will be our first and only broker
KAFKA_BROKER_ID=1
# Define listeneres for accessing broker both inside Docker and from host machine
KAFKA_LISTENER_SECURITY_PROTOCOL_MAP=PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://kafka-1:9092,PLAINTEXT_HOST://localhost:29092
# Zookeeper connection
KAFKA_ZOOKEEPER_CONNECT=zookeeper-1:2181

# In dev, we do not need Confluent metrics
CONFLUENT_SUPPORT_METRICS_ENABLE=false

# As well, we can add some heap pressure
KAFKA_HEAP_OPTS=-Xms256M -Xmx256M -verbose:gc

# In development enviroment, auto-creating topics (and deleting them) could be convenient
KAFKA_AUTO_CREATE_TOPICS_ENABLE=true
KAFKA_DELETE_TOPIC_ENABLE=true

# Eight partitions is more than enough for development
KAFKA_NUM_PARTITIONS=8

# Retain offsets for 31 days - in case you work on your project not that often
KAFKA_OFFSETS_RETENTION_MINUTES=44640

# Since we have just one broker, set replication factors to just one
KAFKA_DEFAULT_REPLICATION_FACTOR=1
KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR=1
KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR=1
KAFKA_TRANSACTION_STATE_LOG_MIN_ISR=1
KAFKA_MIN_INSYNC_REPLICAS=1

# In development environ, we do not need to many threads
KAFKA_NUM_RECOVERY_THREADS_PER_DATA_DIR=1
KAFKA_NUM_NETWORK_THREADS=3
KAFKA_NUM_IO_THREADS=3

# Configure default log cleanup. You can override these on per-topic basis
KAFKA_LOG_CLEANUP_POLICY=compact

KAFKA_LOG_RETENTION_BYTES=-1
KAFKA_LOG_RETENTION_CHECK_INTERVAL_MS=300000
KAFKA_LOG_RETENTION_HOURS=-1

KAFKA_LOG_ROLL_HOURS=24
KAFKA_LOG_SEGMENT_BYTES=1048576
KAFKA_LOG_SEGMENT_DELETE_DELAY_MS=60000