Thanks Matthias. with regard to your point below:
A replication factor of 9 sounds very high. For production, a replication factor of 3 is recommended. Is it possible to dynamically reduce this number to 3 when the topic is actively consumed)? *Disclaimer:* Use it at your own risk. Any and all responsibility for any loss, damage or destruction of data or any other property which may arise from relying on this email's technical content is explicitly disclaimed. The author will in no case be liable for any monetary damages arising from such loss, damage or destruction. On Fri, 12 May 2023 at 19:38, Matthias J. Sax <mj...@apache.org> wrote: > > Does having 9 partitions with 9 replication factors make sense here? > > A replication factor of 9 sounds very high. For production, replication > factor of 3 is recommended. > > How many partitions you want/need is a different question, and cannot be > answered in a general way. > > > "Yes" to all other questions. > > > -Matthias > > > > On 5/12/23 9:50 AM, Mich Talebzadeh wrote: > > 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.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 samekey goto the samepartition and withinthat > > partition the messages are ordered > > > > Thanks > > > > > > *Disclaimer:* Use it at your own risk.Any and all responsibility for any > > loss, damage or destruction of data or any other property which may > > arise from relying on this email's technical content is explicitly > > disclaimed. The author will in no case be liable for any monetary > > damages arising from such loss, damage or destruction. > > >
