Thanks Peter.
This is my modified Json file
{
"version":1,
"partitions":[
{"topic":"md","partition":0,"replicas":[1,3,7]},
{"topic":"md","partition":1,"replicas":[2,8,9]},
{"topic":"md","partition":2,"replicas":[7,10,12]},
{"topic":"md","partition":3,"replicas":[1,12,9]},
{"topic":"md","partition":4,"replicas":[7,9,11]},
{"topic":"md","partition":5,"replicas":[3,11,1]},
{"topic":"md","partition":6,"replicas":[10,1,7]},
{"topic":"md","partition":7,"replicas":[8,7,3]},
{"topic":"md","partition":8,"replicas":[2,3,10]}
]
}
Running below
kafka-reassign-partitions.sh --bootstrap-server rhes75:9092
--reassignment-json-file ./reduce_replication_factor2.json --execute
and
kafka-topics.sh --describe --bootstrap-server rhes75:9092 --topic md
I get
Topic: md TopicId: UfQly87bQPCbVKoH-PQheg PartitionCount: 9
ReplicationFactor: 3 Configs: segment.bytes=1073741824,retention.ms
=1000,retention.bytes=1073741824
Topic: md Partition: 0 Leader: 1 Replicas: 1,3,7
Isr: 1,3,7
Topic: md Partition: 1 Leader: 2 Replicas: 2,8,9
Isr: 2,8,9
Topic: md Partition: 2 Leader: 7 Replicas: 7,10,12
Isr: 10,7,12
Topic: md Partition: 3 Leader: 1 Replicas: 1,12,9
Isr: 1,9,12
Topic: md Partition: 4 Leader: 7 Replicas: 7,9,11
Isr: 9,7,11
Topic: md Partition: 5 Leader: 3 Replicas: 3,11,1
Isr: 1,3,11
Topic: md Partition: 6 Leader: 10 Replicas: 10,1,7
Isr: 10,1,7
Topic: md Partition: 7 Leader: 8 Replicas: 8,7,3
Isr: 7,3,8
Topic: md Partition: 8 Leader: 2 Replicas: 2,3,10
Isr: 10,2,3
I trust this is correct?
Thanks
view my Linkedin profile
<https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/>
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On Thu, 18 May 2023 at 18:53, Peter Bukowinski <pmb...@gmail.com> wrote:
> It looks like you successfully removed replicas from partitions 0, 1, and
> 2, but partitons 3 - 8 still show 9 replicas. You probably intended to
> remove them from all 9 partitions? You’ll need to create another json file
> with partitions 3 - 8 to complete the task.
>
> —
> Peter
>
>
> > On May 17, 2023, at 12:41 AM, Mich Talebzadeh <mich.talebza...@gmail.com>
> wrote:
> >
> > Thanks Miguel, I did that
> >
> > Based on the following Json file
> >
> > {
> > "version":1,
> > "partitions":[
> > {"topic":"md","partition":0,"replicas":[1,3,7]},
> > {"topic":"md","partition":1,"replicas":[2,8,9]},
> > {"topic":"md","partition":2,"replicas":[7,10,12]}
> > ]
> > }
> >
> > I ran this command
> >
> > kafka-reassign-partitions.sh --bootstrap-server rhes75:9092
> > --reassignment-json-file ./reduce_replication_factor2.json --execute
> >
> > Current partition replica assignment
> >
> {"version":1,"partitions":[{"topic":"md","partition":0,"replicas":[1,3,7],"log_dirs":["any","any","any"]},{"topic":"md","partition":1,"replicas":[2,8,9],"log_dirs":["any","any","any"]},{"topic":"md","partition":2,"replicas":[7,10,12],"log_dirs":["any","any","any"]}]}
> > Save this to use as the --reassignment-json-file option during rollback
> > Successfully started partition reassignments for md-0,md-1,md-2
> >
> > kafka-topics.sh --describe --bootstrap-server rhes75:9092 --topic md
> >
> > Topic: md TopicId: UfQly87bQPCbVKoH-PQheg PartitionCount: 9
> > ReplicationFactor: 3 Configs: segment.bytes=1073741824,retention.ms
> > =1000,retention.bytes=1073741824
> > Topic: md Partition: 0 Leader: 1 Replicas: 1,3,7
> > Isr: 1,3,7
> > Topic: md Partition: 1 Leader: 2 Replicas: 2,8,9
> > Isr: 2,8,9
> > Topic: md Partition: 2 Leader: 7 Replicas: 7,10,12
> > Isr: 10,7,12
> > 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
> >
> >
> > Mich
> >
> >
> > view my Linkedin profile
> > <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/>
> >
> >
> > https://en.everybodywiki.com/Mich_Talebzadeh
> >
> >
> >
> > *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 Wed, 17 May 2023 at 00:21, Miguel A. Sotomayor <masfwo...@gmail.com>
> > wrote:
> >
> >> Hi Mich,
> >>
> >> You can use the script `kafka-reassign-partitions.sh` to re-locate or
> >> change the number of replicas
> >>
> >> Regards
> >> Miguel
> >>
> >> El mar, 16 may 2023 a las 18:44, Mich Talebzadeh (<
> >> mich.talebza...@gmail.com>)
> >> escribió:
> >>
> >>> Thanks Peter. I meant reduce replication from 9 to 3 and Not
> partitions.
> >>> Apologies for any confusion
> >>>
> >>>
> >>> Cheers
> >>>
> >>> *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 Tue, 16 May 2023 at 17:38, Peter Bukowinski <pmb...@gmail.com>
> wrote:
> >>>
> >>>> Mich,
> >>>>
> >>>> It is not possible to reduce the number of partitions for a kafka
> topic
> >>>> without deleting and recreating the topic. What previous responders to
> >>> your
> >>>> inquiry noted is that your topic replication of 9 is high. What you
> >> want
> >>> to
> >>>> do is reduce your replication, not the partitions. You can do this
> >> using
> >>>> the same json file you had the first time, with all 9 partitions. Just
> >>>> remove 6 of the 9 broker ids from the replicas array, e.g.
> >>>>
> >>>> cat reduce_replication_factor.json
> >>>> {
> >>>> "version":1,
> >>>> "partitions":[
> >>>> {"topic":"md","partition":0,"replicas":[12,10,8]},
> >>>> {"topic":"md","partition":1,"replicas":[9,8,2]},
> >>>> {"topic":"md","partition":2,"replicas":[11,2,12]},
> >>>> {"topic":"md","partition":3,"replicas":[1,12,9]},
> >>>> {"topic":"md","partition":4,"replicas":[7,9,11]},
> >>>> {"topic":"md","partition":5,"replicas":[3,11,1]}
> >>>> ]
> >>>> }
> >>>>
> >>>> You may want to adjust where the replicas sit to achieve a better
> >> balance
> >>>> across the cluster, but this arrangement only truncates the last 6
> >>> replicas
> >>>> from the list, so should complete quickly as no replica data would
> >> move,
> >>>> only be deleted.
> >>>>
> >>>> —
> >>>> Peter Bukowinski
> >>>>
> >>>>
> >>>>
> >>>>> On May 12, 2023, at 1:24 PM, Mich Talebzadeh <
> >>> mich.talebza...@gmail.com>
> >>>> wrote:
> >>>>>
> >>>>> My bad. Only need 3 partitions
> >>>>>
> >>>>> {
> >>>>> "version":1,
> >>>>> "partitions":[
> >>>>> {"topic":"md","partition":0,"replicas":[12,10,8,2,9,11,1,7,3]},
> >>>>> {"topic":"md","partition":1,"replicas":[9,8,2,12,11,1,7,3,10]},
> >>>>> {"topic":"md","partition":2,"replicas":[11,2,12,9,1,7,3,10,8]}
> >>>>> ]
> >>>>> }
> >>>>>
> >>>>> Mich Talebzadeh,
> >>>>> Lead Solutions Architect/Engineering Lead
> >>>>> Palantir Technologies Limited
> >>>>> London
> >>>>> United Kingdom
> >>>>>
> >>>>>
> >>>>> view my Linkedin profile
> >>>>> <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/>
> >>>>>
> >>>>>
> >>>>> https://en.everybodywiki.com/Mich_Talebzadeh
> >>>>>
> >>>>>
> >>>>>
> >>>>> *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 21:18, Mich Talebzadeh <
> >>> mich.talebza...@gmail.com
> >>>>>
> >>>>> wrote:
> >>>>>
> >>>>>> This json file seemed to work
> >>>>>>
> >>>>>> cat reduce_replication_factor.json
> >>>>>> {
> >>>>>> "version":1,
> >>>>>> "partitions":[
> >>>>>> {"topic":"md","partition":0,"replicas":[12,10,8,2,9,11,1,7,3]},
> >>>>>> {"topic":"md","partition":1,"replicas":[9,8,2,12,11,1,7,3,10]},
> >>>>>> {"topic":"md","partition":2,"replicas":[11,2,12,9,1,7,3,10,8]},
> >>>>>> {"topic":"md","partition":3,"replicas":[1,12,9,11,7,3,10,8,2]},
> >>>>>> {"topic":"md","partition":4,"replicas":[7,9,11,1,3,10,8,2,12]},
> >>>>>> {"topic":"md","partition":5,"replicas":[3,11,1,7,10,8,2,12,9]}
> >>>>>> ]
> >>>>>> }
> >>>>>>
> >>>>>> kafka-reassign-partitions.sh --bootstrap-server
> >>>>>>
> >>>>
> >>>
> >>
> rhes75:9092,rhes75:9093,rhes75:9094,rhes76:9092,rhes76:9093,rhes76:9094,rhes76:9095,rhes76:9096,
> >>>>>> rhes76:9097 --reassignment-json-file
> >> ./reduce_replication_factor.json
> >>>>>> --execute
> >>>>>>
> >>>>>> The output
> >>>>>>
> >>>>>> Successfully started partition reassignments for
> >>>>>> md-0,md-1,md-2,md-3,md-4,md-5
> >>>>>>
> >>>>>>
> >>>>>> I guess it is going to take sometime before it is completed.
> >>>>>>
> >>>>>> Thanks
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> On Fri, 12 May 2023 at 20:16, Mich Talebzadeh <
> >>>> mich.talebza...@gmail.com>
> >>>>>> wrote:
> >>>>>>
> >>>>>>> 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.
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>
> >>>>
> >>>
> >>
> >>
> >> --
> >>
> >>
> >> Saludos.
> >> Miguel Ángel
> >>
>
>
