# Copyright IBM Corp. All Rights Reserved.
#
# SPDX-License-Identifier: Apache-2.0
#

version: '2'

networks:
  ca:
#    attachable: true

services:

  zookeeper0:
    extends:
      file: dc-orderer-kafka-base.yml
      service: zookeeper
    environment:
      # ========================================================================
      #     Reference: https://zookeeper.apache.org/doc/r3.4.9/zookeeperAdmin.html#sc_configuration
      # ========================================================================
      #
      # myid
      # The ID must be unique within the ensemble and should have a value
      # between 1 and 255.
      - ZOO_MY_ID=1
      #
      # server.x=[hostname]:nnnnn[:nnnnn]
      # The list of servers that make up the ZK ensemble. The list that is used
      # by the clients must match the list of ZooKeeper servers that each ZK
      # server has. There are two port numbers `nnnnn`. The first is what
      # followers use to connect to the leader, while the second is for leader
      # election.
      - ZOO_SERVERS=server.1=zookeeper0:2888:3888 server.2=zookeeper1:2888:3888 server.3=zookeeper2:2888:3888

  zookeeper1:
    extends:
      file: dc-orderer-kafka-base.yml
      service: zookeeper
    environment:
      - ZOO_MY_ID=2
      - ZOO_SERVERS=server.1=zookeeper0:2888:3888 server.2=zookeeper1:2888:3888 server.3=zookeeper2:2888:3888

  zookeeper2:
    extends:
      file: dc-orderer-kafka-base.yml
      service: zookeeper
    environment:
      - ZOO_MY_ID=3
      - ZOO_SERVERS=server.1=zookeeper0:2888:3888 server.2=zookeeper1:2888:3888 server.3=zookeeper2:2888:3888

  kafka0:
    extends:
      file: dc-orderer-kafka-base.yml
      service: kafka
    environment:
      # ========================================================================
      #     Reference: https://kafka.apache.org/documentation/#configuration
      # ========================================================================
      #
      # broker.id
      - KAFKA_BROKER_ID=0
      #
      # min.insync.replicas
      # Let the value of this setting be M. Data is considered committed when
      # it is written to at least M replicas (which are then considered in-sync
      # and belong to the in-sync replica set, or ISR). In any other case, the
      # write operation returns an error. Then:
      # 1. If up to M-N replicas -- out of the N (see default.replication.factor
      # below) that the channel data is written to -- become unavailable,
      # operations proceed normally.
      # 2. If more replicas become unavailable, Kafka cannot maintain an ISR set
      # of M, so it stops accepting writes. Reads work without issues. The
      # channel becomes writeable again when M replicas get in-sync.
      - KAFKA_MIN_INSYNC_REPLICAS=1
      #
      # default.replication.factor
      # Let the value of this setting be N. A replication factor of N means that
      # each channel will have its data replicated to N brokers. These are the
      # candidates for the ISR set of a channel. As we noted in the
      # min.insync.replicas section above, not all of these brokers have to be
      # available all the time. In this sample configuration we choose a
      # default.replication.factor of K-1 (where K is the total number of brokers in
      # our Kafka cluster) so as to have the largest possible candidate set for
      # a channel's ISR. We explicitly avoid setting N equal to K because
      # channel creations cannot go forward if less than N brokers are up. If N
      # were set equal to K, a single broker going down would mean that we would
      # not be able to create new channels, i.e. the crash fault tolerance of
      # the ordering service would be non-existent.
      - KAFKA_DEFAULT_REPLICATION_FACTOR=1
      #
      # zookeper.connect
      # Point to the set of Zookeeper nodes comprising a ZK ensemble.
      - KAFKA_ZOOKEEPER_CONNECT=zookeeper0:2181,zookeeper1:2181,zookeeper2:2181
      #
      # zookeeper.connection.timeout.ms
      # The max time that the client waits to establish a connection to
      # Zookeeper. If not set, the value in zookeeper.session.timeout.ms (below)
      # is used.
      #- KAFKA_ZOOKEEPER_CONNECTION_TIMEOUT_MS = 6000
      #
      # zookeeper.session.timeout.ms
      #- KAFKA_ZOOKEEPER_SESSION_TIMEOUT_MS = 6000
      - KAFKA_ADVERTISED_HOST_NAME=172.31.30.169
      - KAFKA_ADVERTISED_PORT=32792
    depends_on:
      - zookeeper0
      - zookeeper1
      - zookeeper2
    ports:
      - "32792:9092"

  kafka1:
    extends:
      file: dc-orderer-kafka-base.yml
      service: kafka
    environment:
      - KAFKA_BROKER_ID=1
      - KAFKA_DEFAULT_REPLICATION_FACTOR=1
      - KAFKA_MIN_INSYNC_REPLICAS=1
      - KAFKA_ZOOKEEPER_CONNECT=zookeeper0:2181,zookeeper1:2181,zookeeper2:2181
      - KAFKA_ADVERTISED_HOST_NAME=172.31.30.169
      - KAFKA_ADVERTISED_PORT=32793
    depends_on:
      - zookeeper0
      - zookeeper1
      - zookeeper2
    ports:
      - "32793:9092"