Hi,
I have used Apache Kafka in conjunction with Spark as a messaging source.
This rather dated diagram describes it
I have two physical hosts each 64 GB, running RHES 7.6, these are called
rhes75 and rhes76 respectively. The Zookeeper version is 3.7.1 and kafka
version is 3.4.0
[image: image.png]
I have a topic md -> MarketData that has been defined as below
kafka-topics.sh --create --bootstrap-server
rhes75:9092,rhes75:9093,rhes75:9094,rhes76:9092,rhes76:9093,rhes76:9094,rhes76:9095,rhes76:9096,
rhes76:9097 --replication-factor 9 --partitions 9 --topic md
kafka-topics.sh --describe --bootstrap-server
rhes75:9092,rhes75:9093,rhes75:9094,rhes76:9092,rhes76:9093,rhes76:9094,rhes76:9095,rhes76:9096,
rhes76:9097 --topic md
This is working fine
Topic: md TopicId: UfQly87bQPCbVKoH-PQheg PartitionCount: 9
ReplicationFactor: 9 Configs: segment.bytes=1073741824
Topic: md Partition: 0 Leader: 12 Replicas:
12,10,8,2,9,11,1,7,3 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 1 Leader: 9 Replicas:
9,8,2,12,11,1,7,3,10 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 2 Leader: 11 Replicas:
11,2,12,9,1,7,3,10,8 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 3 Leader: 1 Replicas:
1,12,9,11,7,3,10,8,2 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 4 Leader: 7 Replicas:
7,9,11,1,3,10,8,2,12 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 5 Leader: 3 Replicas:
3,11,1,7,10,8,2,12,9 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 6 Leader: 10 Replicas:
10,1,7,3,8,2,12,9,11 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 7 Leader: 8 Replicas:
8,7,3,10,2,12,9,11,1 Isr: 10,1,9,2,12,7,3,11,8
Topic: md Partition: 8 Leader: 2 Replicas:
2,3,10,8,12,9,11,1,7 Isr: 10,1,9,2,12,7,3,11,8
However, I have a number of questions
1. Does having 9 partitions with 9 replication factors make sense here?
2. As I understand the parallelism is equal to the number of partitions
for a topic.
3. Kafka only provides a total order over messages *within a partition*,
not between different partitions in a topic and in this case I have one
topic
4.
Data within a Partition will be stored in the order in which it is
written, therefore, data read from a Partition will be read in order for
that partition?
5.
Finally if I want to get messages in order across multiple all 9
partitionss, then I need to group messages with a key, so that messages with
the same key go to the same partition and within that partition the
messages are ordered
Thanks
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