Re: Kafka topic partition distributing evenly on disks
Or manually you can move data dir . I'm assuming you have replica >1
Stop the kafka process on broker 1
Move 1 or 2 dir log from Disk 1 to disk 2
And start the kafka process
Wait for ISR sync
Then you can repeate this step again .
On 8/7/20, 6:45 AM, "William Reynolds"
wrote:
[External]
Hmm, that's odd, I am sure it was in the docs previously. Here is the
KIP on it
https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcwiki.apache.org%2Fconfluence%2Fdisplay%2FKAFKA%2FKIP-113%253A%2BSupport%2Breplicas%2Bmovement%2Bbetween%2Blog%2Bdirectoriesdata=02%7C01%7CManoj.Agrawal2%40cognizant.com%7C3c313758d6c44da817ac08d83ad8262f%7Cde08c40719b9427d9fe8edf254300ca7%7C0%7C0%7C637324047321152477sdata=tTYPxMp%2FmZ9ufSXQqY%2FbDwAIAG4ZNxRrc7fFq3EEvSg%3Dreserved=0
Basically the reassignment json that you get looks like this from the
initial generation and if you already have a realignment file you can
just add the log dirs section to each partition entry
{
"version" : int,
"partitions" : [
{
"topic" : str,
"partition" : int,
"replicas" : [int],
"log_dirs" : [str]<-- NEW. A log directory can be either
"any", or a valid absolute path that begins with '/'. This is an
optional filed. It is treated as an array of "any" if this field is
not explicitly specified in the json file.
},
...
]
}
Hope that helps
William
On 07/08/2020, Péter Nagykátai wrote:
> Thank you William,
>
> I checked the doc and don't see any instructions regarding disks. Should I
> simply "move around" the topics and Kafka will assign the topics evenly on
> the two disks (per broker)? The current setup looks like this (for the
> topic in question, 15 primary, replica partitions):
>
> Broker 1 - disk 1: 8 partition
> Broker 1 - disk 2: 2 partition
>
> Broker 2 - disk 1: 8 partition
> Broker 2 - disk 2: 2 partition
>
> Broker 3 - disk 1: 8 partition
> Broker 3 - disk 2: 2 partition
>
> Thanks!
>
> On Fri, Aug 7, 2020 at 1:01 PM William Reynolds <
> william.reyno...@instaclustr.com> wrote:
>
>> Hi Péter,
>> Sounds like time to reassign the partitions you have across all the
>> brokers/data dirs using the instructions from here
>>
https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkafka.apache.org%2Fdocumentation%2F%23basic_ops_automigratedata=02%7C01%7CManoj.Agrawal2%40cognizant.com%7C3c313758d6c44da817ac08d83ad8262f%7Cde08c40719b9427d9fe8edf254300ca7%7C0%7C0%7C637324047321162468sdata=yWH5xhV8GXsTAOubFU1QmkuMlChpx6DVNe%2BKPpe5bwk%3Dreserved=0.
That
>> assumes that your partition strategy has somewhat evenly filled your
>> partitions and given it may move all the partitions it could be a bit
>> intensive so be sure to use the throttle option.
>> Cheers
>> William
>>
>> On 07/08/2020, Péter Nagykátai wrote:
>> > Hello everybody,
>> >
>> > Thank you for the detailed answers. My issue is partly answered here:
>> >
>> >
>> >
>> >
>> > *This rule also applies to disk-level, which means that when a set
>> > ofpartitions assigned to a specific broker, each of the disks will get
>> > thesame number of partitions without considering the load of disks at
>> > thattime.*
>> >
>> > I admit, I didn't provide enough info either.
>> >
>> > So my problem is that an existing topic got a huge surge of events for
>> this
>> > week. I knew that'll happen and I modified the partition count.
>> > Unfortunately, it occurred to me a bit later, that I'll likely need
>> > some
>> > extra disk space. So I added an extra disk to each broker. The thing I
>> > didn't know, that Kafka won't evenly distribute the partitions on the
>> > disks.
>> > So the question still remains:
>> > Is there any way to have Kafka evenly distribute data on its disks?
>> > Also, what options do I have *after *I'm in the situation I described
>> > above? (preferably without deleting the topic)
>> >
>> > Thanks!
>> >
>> > On Fri, Aug 7, 2020 at 12:00 PM Yingshuan Song
>> >
>> > wrote:
>> >
>> >> Hi Peter,
>> >> Agreed with Manoj and Vinicius, i think those rules led to this result
>> >> :
>> >>
>> >> 1）the partitions of a topic - N and replication number - R determine
>> >> the
>> >> real partition-replica count of this topic, which is N * R;
>> >> 2) kafka can distribute partitions evenly among brokers, but it is
>> >> based
>> >> on the broker count when the topic was created, this is important.
>> >> If we create a topic (N - 4, R - 3) in a kafka cluster which contains
>> >> 3
>> >> kafka brokers, then 4 * 3 / 3 = 4 partitions will be assigned to each
>> >> broker.
>> >> But if a new broker was added into
Re: Kafka topic partition distributing evenly on disks
Hmm, that's odd, I am sure it was in the docs previously. Here is the
KIP on it
https://cwiki.apache.org/confluence/display/KAFKA/KIP-113%3A+Support+replicas+movement+between+log+directories
Basically the reassignment json that you get looks like this from the
initial generation and if you already have a realignment file you can
just add the log dirs section to each partition entry
{
"version" : int,
"partitions" : [
{
"topic" : str,
"partition" : int,
"replicas" : [int],
"log_dirs" : [str]<-- NEW. A log directory can be either
"any", or a valid absolute path that begins with '/'. This is an
optional filed. It is treated as an array of "any" if this field is
not explicitly specified in the json file.
},
...
]
}
Hope that helps
William
On 07/08/2020, Péter Nagykátai wrote:
> Thank you William,
>
> I checked the doc and don't see any instructions regarding disks. Should I
> simply "move around" the topics and Kafka will assign the topics evenly on
> the two disks (per broker)? The current setup looks like this (for the
> topic in question, 15 primary, replica partitions):
>
> Broker 1 - disk 1: 8 partition
> Broker 1 - disk 2: 2 partition
>
> Broker 2 - disk 1: 8 partition
> Broker 2 - disk 2: 2 partition
>
> Broker 3 - disk 1: 8 partition
> Broker 3 - disk 2: 2 partition
>
> Thanks!
>
> On Fri, Aug 7, 2020 at 1:01 PM William Reynolds <
> william.reyno...@instaclustr.com> wrote:
>
>> Hi Péter,
>> Sounds like time to reassign the partitions you have across all the
>> brokers/data dirs using the instructions from here
>> https://kafka.apache.org/documentation/#basic_ops_automigrate. That
>> assumes that your partition strategy has somewhat evenly filled your
>> partitions and given it may move all the partitions it could be a bit
>> intensive so be sure to use the throttle option.
>> Cheers
>> William
>>
>> On 07/08/2020, Péter Nagykátai wrote:
>> > Hello everybody,
>> >
>> > Thank you for the detailed answers. My issue is partly answered here:
>> >
>> >
>> >
>> >
>> > *This rule also applies to disk-level, which means that when a set
>> > ofpartitions assigned to a specific broker, each of the disks will get
>> > thesame number of partitions without considering the load of disks at
>> > thattime.*
>> >
>> > I admit, I didn't provide enough info either.
>> >
>> > So my problem is that an existing topic got a huge surge of events for
>> this
>> > week. I knew that'll happen and I modified the partition count.
>> > Unfortunately, it occurred to me a bit later, that I'll likely need
>> > some
>> > extra disk space. So I added an extra disk to each broker. The thing I
>> > didn't know, that Kafka won't evenly distribute the partitions on the
>> > disks.
>> > So the question still remains:
>> > Is there any way to have Kafka evenly distribute data on its disks?
>> > Also, what options do I have *after *I'm in the situation I described
>> > above? (preferably without deleting the topic)
>> >
>> > Thanks!
>> >
>> > On Fri, Aug 7, 2020 at 12:00 PM Yingshuan Song
>> >
>> > wrote:
>> >
>> >> Hi Peter,
>> >> Agreed with Manoj and Vinicius, i think those rules led to this result
>> >> :
>> >>
>> >> 1）the partitions of a topic - N and replication number - R determine
>> >> the
>> >> real partition-replica count of this topic, which is N * R;
>> >> 2) kafka can distribute partitions evenly among brokers, but it is
>> >> based
>> >> on the broker count when the topic was created, this is important.
>> >> If we create a topic (N - 4, R - 3) in a kafka cluster which contains
>> >> 3
>> >> kafka brokers, then 4 * 3 / 3 = 4 partitions will be assigned to each
>> >> broker.
>> >> But if a new broker was added into this cluster and another topic (N -
>> 4,
>> >> R
>> >> - 3) need to be created, then 4 * 3 / 4 = 3 partitions will be
>> >> assigned
>> >> to
>> >> each broker.
>> >> Kafka will not assign all those partitions to the new added broker
>> >> even
>> >> though it is idle and i think this is a shortcoming of kafka.
>> >> This rule also applies to disk-level, which means that when a set of
>> >> partitions assigned to a specific broker, each of the disks will get
>> >> the
>> >> same number of partitions without considering the load of disks at
>> >> that
>> >> time.
>> >> 3） when producer send records to topics, how to chose partiton : 3-1)
>> >> if
>> >> a
>> >> record has a key, then the partition number calculate according to the
>> >> key;
>> >> 3-2) if records have no keys, then those records will be sent to each
>> >> partition in turns. So, if there are lots of records with the same
>> >> key,
>> >> and
>> >> those records will be sent to the same partition, and may take up a
>> >> lot
>> >> of
>> >> disk space.
>> >>
>> >>
>> >> hope this helps
>> >>
>> >> Vinicius Scheidegger 于2020年8月7日周五
>> >> 上午6:10写道：
>> >>
>> >> > Hi Peter,
>> >> >
>> >> > AFAIK, everything depends on:
>> >> >
>> >> > 1) How you have configured your topic
>> >> > a) number of
Re: Kafka topic partition distributing evenly on disks
Thank you William, I checked the doc and don't see any instructions regarding disks. Should I simply "move around" the topics and Kafka will assign the topics evenly on the two disks (per broker)? The current setup looks like this (for the topic in question, 15 primary, replica partitions): Broker 1 - disk 1: 8 partition Broker 1 - disk 2: 2 partition Broker 2 - disk 1: 8 partition Broker 2 - disk 2: 2 partition Broker 3 - disk 1: 8 partition Broker 3 - disk 2: 2 partition Thanks! On Fri, Aug 7, 2020 at 1:01 PM William Reynolds < william.reyno...@instaclustr.com> wrote: > Hi Péter, > Sounds like time to reassign the partitions you have across all the > brokers/data dirs using the instructions from here > https://kafka.apache.org/documentation/#basic_ops_automigrate. That > assumes that your partition strategy has somewhat evenly filled your > partitions and given it may move all the partitions it could be a bit > intensive so be sure to use the throttle option. > Cheers > William > > On 07/08/2020, Péter Nagykátai wrote: > > Hello everybody, > > > > Thank you for the detailed answers. My issue is partly answered here: > > > > > > > > > > *This rule also applies to disk-level, which means that when a set > > ofpartitions assigned to a specific broker, each of the disks will get > > thesame number of partitions without considering the load of disks at > > thattime.* > > > > I admit, I didn't provide enough info either. > > > > So my problem is that an existing topic got a huge surge of events for > this > > week. I knew that'll happen and I modified the partition count. > > Unfortunately, it occurred to me a bit later, that I'll likely need some > > extra disk space. So I added an extra disk to each broker. The thing I > > didn't know, that Kafka won't evenly distribute the partitions on the > > disks. > > So the question still remains: > > Is there any way to have Kafka evenly distribute data on its disks? > > Also, what options do I have *after *I'm in the situation I described > > above? (preferably without deleting the topic) > > > > Thanks! > > > > On Fri, Aug 7, 2020 at 12:00 PM Yingshuan Song > > wrote: > > > >> Hi Peter, > >> Agreed with Manoj and Vinicius, i think those rules led to this result : > >> > >> 1）the partitions of a topic - N and replication number - R determine the > >> real partition-replica count of this topic, which is N * R; > >> 2) kafka can distribute partitions evenly among brokers, but it is > >> based > >> on the broker count when the topic was created, this is important. > >> If we create a topic (N - 4, R - 3) in a kafka cluster which contains 3 > >> kafka brokers, then 4 * 3 / 3 = 4 partitions will be assigned to each > >> broker. > >> But if a new broker was added into this cluster and another topic (N - > 4, > >> R > >> - 3) need to be created, then 4 * 3 / 4 = 3 partitions will be assigned > >> to > >> each broker. > >> Kafka will not assign all those partitions to the new added broker even > >> though it is idle and i think this is a shortcoming of kafka. > >> This rule also applies to disk-level, which means that when a set of > >> partitions assigned to a specific broker, each of the disks will get the > >> same number of partitions without considering the load of disks at that > >> time. > >> 3） when producer send records to topics, how to chose partiton : 3-1) if > >> a > >> record has a key, then the partition number calculate according to the > >> key; > >> 3-2) if records have no keys, then those records will be sent to each > >> partition in turns. So, if there are lots of records with the same key, > >> and > >> those records will be sent to the same partition, and may take up a lot > >> of > >> disk space. > >> > >> > >> hope this helps > >> > >> Vinicius Scheidegger 于2020年8月7日周五 > >> 上午6:10写道： > >> > >> > Hi Peter, > >> > > >> > AFAIK, everything depends on: > >> > > >> > 1) How you have configured your topic > >> > a) number of partitions (here I understand you have 15 partitions) > >> > b) partition replication configuration (each partition necessarily > >> > has > >> a > >> > leader - primary responsible to hold the data - and for reads and > >> > writes) > >> > you can configure the topic to have a number of replicas > >> > 2) How you publish messages to the topic > >> > a) The publisher is responsible to choose the partition. This can be > >> done > >> > consciously (by setting the partition id while sending the message to > >> > the > >> > topic) or unconsciously (by using the DefaultPartitioner or any other > >> > partitioner scheme). > >> > > >> > All messages sent to a specific partition will be written first to the > >> > leader (meaning that the disk configured for the partition leader will > >> > receive the load) and then replicated to the replica (followers). > >> > Kafka does not automatically distribute the data equally to the > >> > different > >> > brokers - you need to think about your architecture having that in > >> >
Re: Kafka topic partition distributing evenly on disks
Hi Péter, Sounds like time to reassign the partitions you have across all the brokers/data dirs using the instructions from here https://kafka.apache.org/documentation/#basic_ops_automigrate. That assumes that your partition strategy has somewhat evenly filled your partitions and given it may move all the partitions it could be a bit intensive so be sure to use the throttle option. Cheers William On 07/08/2020, Péter Nagykátai wrote: > Hello everybody, > > Thank you for the detailed answers. My issue is partly answered here: > > > > > *This rule also applies to disk-level, which means that when a set > ofpartitions assigned to a specific broker, each of the disks will get > thesame number of partitions without considering the load of disks at > thattime.* > > I admit, I didn't provide enough info either. > > So my problem is that an existing topic got a huge surge of events for this > week. I knew that'll happen and I modified the partition count. > Unfortunately, it occurred to me a bit later, that I'll likely need some > extra disk space. So I added an extra disk to each broker. The thing I > didn't know, that Kafka won't evenly distribute the partitions on the > disks. > So the question still remains: > Is there any way to have Kafka evenly distribute data on its disks? > Also, what options do I have *after *I'm in the situation I described > above? (preferably without deleting the topic) > > Thanks! > > On Fri, Aug 7, 2020 at 12:00 PM Yingshuan Song > wrote: > >> Hi Peter, >> Agreed with Manoj and Vinicius, i think those rules led to this result : >> >> 1）the partitions of a topic - N and replication number - R determine the >> real partition-replica count of this topic, which is N * R; >> 2) kafka can distribute partitions evenly among brokers, but it is >> based >> on the broker count when the topic was created, this is important. >> If we create a topic (N - 4, R - 3) in a kafka cluster which contains 3 >> kafka brokers, then 4 * 3 / 3 = 4 partitions will be assigned to each >> broker. >> But if a new broker was added into this cluster and another topic (N - 4, >> R >> - 3) need to be created, then 4 * 3 / 4 = 3 partitions will be assigned >> to >> each broker. >> Kafka will not assign all those partitions to the new added broker even >> though it is idle and i think this is a shortcoming of kafka. >> This rule also applies to disk-level, which means that when a set of >> partitions assigned to a specific broker, each of the disks will get the >> same number of partitions without considering the load of disks at that >> time. >> 3） when producer send records to topics, how to chose partiton : 3-1) if >> a >> record has a key, then the partition number calculate according to the >> key; >> 3-2) if records have no keys, then those records will be sent to each >> partition in turns. So, if there are lots of records with the same key, >> and >> those records will be sent to the same partition, and may take up a lot >> of >> disk space. >> >> >> hope this helps >> >> Vinicius Scheidegger 于2020年8月7日周五 >> 上午6:10写道： >> >> > Hi Peter, >> > >> > AFAIK, everything depends on: >> > >> > 1) How you have configured your topic >> > a) number of partitions (here I understand you have 15 partitions) >> > b) partition replication configuration (each partition necessarily >> > has >> a >> > leader - primary responsible to hold the data - and for reads and >> > writes) >> > you can configure the topic to have a number of replicas >> > 2) How you publish messages to the topic >> > a) The publisher is responsible to choose the partition. This can be >> done >> > consciously (by setting the partition id while sending the message to >> > the >> > topic) or unconsciously (by using the DefaultPartitioner or any other >> > partitioner scheme). >> > >> > All messages sent to a specific partition will be written first to the >> > leader (meaning that the disk configured for the partition leader will >> > receive the load) and then replicated to the replica (followers). >> > Kafka does not automatically distribute the data equally to the >> > different >> > brokers - you need to think about your architecture having that in >> > mind. >> > >> > I hope it helps >> > >> > On Thu, Aug 6, 2020 at 10:23 PM Péter Nagykátai >> > wrote: >> > >> > > I initially started with one data disk (mounted solely to hold Kafka >> > data) >> > > and recently added a new one. >> > > >> > > On Thu, Aug 6, 2020 at 10:13 PM wrote: >> > > >> > > > What do you mean older disk ? >> > > > >> > > > On 8/6/20, 12:05 PM, "Péter Nagykátai" >> wrote: >> > > > >> > > > [External] >> > > > >> > > > >> > > > Yeah, but it doesn't do that. My "older" disks have ~70 >> partitions, >> > > the >> > > > newer ones ~5 partitions. That's why I'm asking what went >> > > > wrong. >> > > > >> > > > On Thu, Aug 6, 2020 at 8:35 PM >> > wrote: >> > > > >> > > > > Kafka evenly distributed number of partition on each disk so >> in >> > > >
Re: Kafka topic partition distributing evenly on disks
Hello everybody, Thank you for the detailed answers. My issue is partly answered here: *This rule also applies to disk-level, which means that when a set ofpartitions assigned to a specific broker, each of the disks will get thesame number of partitions without considering the load of disks at thattime.* I admit, I didn't provide enough info either. So my problem is that an existing topic got a huge surge of events for this week. I knew that'll happen and I modified the partition count. Unfortunately, it occurred to me a bit later, that I'll likely need some extra disk space. So I added an extra disk to each broker. The thing I didn't know, that Kafka won't evenly distribute the partitions on the disks. So the question still remains: Is there any way to have Kafka evenly distribute data on its disks? Also, what options do I have *after *I'm in the situation I described above? (preferably without deleting the topic) Thanks! On Fri, Aug 7, 2020 at 12:00 PM Yingshuan Song wrote: > Hi Peter, > Agreed with Manoj and Vinicius, i think those rules led to this result : > > 1）the partitions of a topic - N and replication number - R determine the > real partition-replica count of this topic, which is N * R; > 2) kafka can distribute partitions evenly among brokers, but it is based > on the broker count when the topic was created, this is important. > If we create a topic (N - 4, R - 3) in a kafka cluster which contains 3 > kafka brokers, then 4 * 3 / 3 = 4 partitions will be assigned to each > broker. > But if a new broker was added into this cluster and another topic (N - 4, R > - 3) need to be created, then 4 * 3 / 4 = 3 partitions will be assigned to > each broker. > Kafka will not assign all those partitions to the new added broker even > though it is idle and i think this is a shortcoming of kafka. > This rule also applies to disk-level, which means that when a set of > partitions assigned to a specific broker, each of the disks will get the > same number of partitions without considering the load of disks at that > time. > 3） when producer send records to topics, how to chose partiton : 3-1) if a > record has a key, then the partition number calculate according to the key; > 3-2) if records have no keys, then those records will be sent to each > partition in turns. So, if there are lots of records with the same key, and > those records will be sent to the same partition, and may take up a lot of > disk space. > > > hope this helps > > Vinicius Scheidegger 于2020年8月7日周五 > 上午6:10写道： > > > Hi Peter, > > > > AFAIK, everything depends on: > > > > 1) How you have configured your topic > > a) number of partitions (here I understand you have 15 partitions) > > b) partition replication configuration (each partition necessarily has > a > > leader - primary responsible to hold the data - and for reads and writes) > > you can configure the topic to have a number of replicas > > 2) How you publish messages to the topic > > a) The publisher is responsible to choose the partition. This can be > done > > consciously (by setting the partition id while sending the message to the > > topic) or unconsciously (by using the DefaultPartitioner or any other > > partitioner scheme). > > > > All messages sent to a specific partition will be written first to the > > leader (meaning that the disk configured for the partition leader will > > receive the load) and then replicated to the replica (followers). > > Kafka does not automatically distribute the data equally to the different > > brokers - you need to think about your architecture having that in mind. > > > > I hope it helps > > > > On Thu, Aug 6, 2020 at 10:23 PM Péter Nagykátai > > wrote: > > > > > I initially started with one data disk (mounted solely to hold Kafka > > data) > > > and recently added a new one. > > > > > > On Thu, Aug 6, 2020 at 10:13 PM wrote: > > > > > > > What do you mean older disk ? > > > > > > > > On 8/6/20, 12:05 PM, "Péter Nagykátai" > wrote: > > > > > > > > [External] > > > > > > > > > > > > Yeah, but it doesn't do that. My "older" disks have ~70 > partitions, > > > the > > > > newer ones ~5 partitions. That's why I'm asking what went wrong. > > > > > > > > On Thu, Aug 6, 2020 at 8:35 PM > > wrote: > > > > > > > > > Kafka evenly distributed number of partition on each disk so > in > > > > your case > > > > > every disk should have 3/2 topic partitions . > > > > > It is producer job to evenly produce data by partition key to > > > topic > > > > > partition . > > > > > How it partition key , it is auto generated or producer sending > > key > > > > along > > > > > with message . > > > > > > > > > > > > > > > On 8/6/20, 7:29 AM, "Péter Nagykátai" > > > wrote: > > > > > > > > > > [External] > > > > > > > > > > > > > > > Hello, > > > > > > > > > > I have a Kafka cluster with 3 brokers (v2.3.0) and each > > broker > > > > has 2 > > > >
Re: Kafka topic partition distributing evenly on disks
Hi Peter, Agreed with Manoj and Vinicius, i think those rules led to this result : 1）the partitions of a topic - N and replication number - R determine the real partition-replica count of this topic, which is N * R; 2) kafka can distribute partitions evenly among brokers, but it is based on the broker count when the topic was created, this is important. If we create a topic (N - 4, R - 3) in a kafka cluster which contains 3 kafka brokers, then 4 * 3 / 3 = 4 partitions will be assigned to each broker. But if a new broker was added into this cluster and another topic (N - 4, R - 3) need to be created, then 4 * 3 / 4 = 3 partitions will be assigned to each broker. Kafka will not assign all those partitions to the new added broker even though it is idle and i think this is a shortcoming of kafka. This rule also applies to disk-level, which means that when a set of partitions assigned to a specific broker, each of the disks will get the same number of partitions without considering the load of disks at that time. 3） when producer send records to topics, how to chose partiton : 3-1) if a record has a key, then the partition number calculate according to the key; 3-2) if records have no keys, then those records will be sent to each partition in turns. So, if there are lots of records with the same key, and those records will be sent to the same partition, and may take up a lot of disk space. hope this helps Vinicius Scheidegger 于2020年8月7日周五 上午6:10写道： > Hi Peter, > > AFAIK, everything depends on: > > 1) How you have configured your topic > a) number of partitions (here I understand you have 15 partitions) > b) partition replication configuration (each partition necessarily has a > leader - primary responsible to hold the data - and for reads and writes) > you can configure the topic to have a number of replicas > 2) How you publish messages to the topic > a) The publisher is responsible to choose the partition. This can be done > consciously (by setting the partition id while sending the message to the > topic) or unconsciously (by using the DefaultPartitioner or any other > partitioner scheme). > > All messages sent to a specific partition will be written first to the > leader (meaning that the disk configured for the partition leader will > receive the load) and then replicated to the replica (followers). > Kafka does not automatically distribute the data equally to the different > brokers - you need to think about your architecture having that in mind. > > I hope it helps > > On Thu, Aug 6, 2020 at 10:23 PM Péter Nagykátai > wrote: > > > I initially started with one data disk (mounted solely to hold Kafka > data) > > and recently added a new one. > > > > On Thu, Aug 6, 2020 at 10:13 PM wrote: > > > > > What do you mean older disk ? > > > > > > On 8/6/20, 12:05 PM, "Péter Nagykátai" wrote: > > > > > > [External] > > > > > > > > > Yeah, but it doesn't do that. My "older" disks have ~70 partitions, > > the > > > newer ones ~5 partitions. That's why I'm asking what went wrong. > > > > > > On Thu, Aug 6, 2020 at 8:35 PM > wrote: > > > > > > > Kafka evenly distributed number of partition on each disk so in > > > your case > > > > every disk should have 3/2 topic partitions . > > > > It is producer job to evenly produce data by partition key to > > topic > > > > partition . > > > > How it partition key , it is auto generated or producer sending > key > > > along > > > > with message . > > > > > > > > > > > > On 8/6/20, 7:29 AM, "Péter Nagykátai" > > wrote: > > > > > > > > [External] > > > > > > > > > > > > Hello, > > > > > > > > I have a Kafka cluster with 3 brokers (v2.3.0) and each > broker > > > has 2 > > > > disks > > > > attached. I added a new topic (heavyweight) and was surprised > > > that > > > > even if > > > > the topic has 15 partitions, those weren't distributed evenly > > on > > > the > > > > disks. > > > > Thus I got one disk that's almost empty and the other almost > > > filled > > > > up. Is > > > > there any way to have Kafka evenly distribute data on its > > disks? > > > > > > > > Thank you! > > > > > > > > > > > > This e-mail and any files transmitted with it are for the sole > use > > > of the > > > > intended recipient(s) and may contain confidential and privileged > > > > information. If you are not the intended recipient(s), please > reply > > > to the > > > > sender and destroy all copies of the original message. Any > > > unauthorized > > > > review, use, disclosure, dissemination, forwarding, printing or > > > copying of > > > > this email, and/or any action taken in reliance on the contents > of > > > this > > > > e-mail is strictly prohibited and may be unlawful. Where > permitted > > by > > > > applicable law, this e-mail and other e-mail communications sent > to > > > and > >
Re: Kafka topic partition distributing evenly on disks
Hi Peter, AFAIK, everything depends on: 1) How you have configured your topic a) number of partitions (here I understand you have 15 partitions) b) partition replication configuration (each partition necessarily has a leader - primary responsible to hold the data - and for reads and writes) you can configure the topic to have a number of replicas 2) How you publish messages to the topic a) The publisher is responsible to choose the partition. This can be done consciously (by setting the partition id while sending the message to the topic) or unconsciously (by using the DefaultPartitioner or any other partitioner scheme). All messages sent to a specific partition will be written first to the leader (meaning that the disk configured for the partition leader will receive the load) and then replicated to the replica (followers). Kafka does not automatically distribute the data equally to the different brokers - you need to think about your architecture having that in mind. I hope it helps On Thu, Aug 6, 2020 at 10:23 PM Péter Nagykátai wrote: > I initially started with one data disk (mounted solely to hold Kafka data) > and recently added a new one. > > On Thu, Aug 6, 2020 at 10:13 PM wrote: > > > What do you mean older disk ? > > > > On 8/6/20, 12:05 PM, "Péter Nagykátai" wrote: > > > > [External] > > > > > > Yeah, but it doesn't do that. My "older" disks have ~70 partitions, > the > > newer ones ~5 partitions. That's why I'm asking what went wrong. > > > > On Thu, Aug 6, 2020 at 8:35 PM wrote: > > > > > Kafka evenly distributed number of partition on each disk so in > > your case > > > every disk should have 3/2 topic partitions . > > > It is producer job to evenly produce data by partition key to > topic > > > partition . > > > How it partition key , it is auto generated or producer sending key > > along > > > with message . > > > > > > > > > On 8/6/20, 7:29 AM, "Péter Nagykátai" > wrote: > > > > > > [External] > > > > > > > > > Hello, > > > > > > I have a Kafka cluster with 3 brokers (v2.3.0) and each broker > > has 2 > > > disks > > > attached. I added a new topic (heavyweight) and was surprised > > that > > > even if > > > the topic has 15 partitions, those weren't distributed evenly > on > > the > > > disks. > > > Thus I got one disk that's almost empty and the other almost > > filled > > > up. Is > > > there any way to have Kafka evenly distribute data on its > disks? > > > > > > Thank you! > > > > > > > > > This e-mail and any files transmitted with it are for the sole use > > of the > > > intended recipient(s) and may contain confidential and privileged > > > information. If you are not the intended recipient(s), please reply > > to the > > > sender and destroy all copies of the original message. Any > > unauthorized > > > review, use, disclosure, dissemination, forwarding, printing or > > copying of > > > this email, and/or any action taken in reliance on the contents of > > this > > > e-mail is strictly prohibited and may be unlawful. Where permitted > by > > > applicable law, this e-mail and other e-mail communications sent to > > and > > > from Cognizant e-mail addresses may be monitored. > > > This e-mail and any files transmitted with it are for the sole use > > of the > > > intended recipient(s) and may contain confidential and privileged > > > information. If you are not the intended recipient(s), please reply > > to the > > > sender and destroy all copies of the original message. Any > > unauthorized > > > review, use, disclosure, dissemination, forwarding, printing or > > copying of > > > this email, and/or any action taken in reliance on the contents of > > this > > > e-mail is strictly prohibited and may be unlawful. Where permitted > by > > > applicable law, this e-mail and other e-mail communications sent to > > and > > > from Cognizant e-mail addresses may be monitored. > > > > > > > > > This e-mail and any files transmitted with it are for the sole use of the > > intended recipient(s) and may contain confidential and privileged > > information. If you are not the intended recipient(s), please reply to > the > > sender and destroy all copies of the original message. Any unauthorized > > review, use, disclosure, dissemination, forwarding, printing or copying > of > > this email, and/or any action taken in reliance on the contents of this > > e-mail is strictly prohibited and may be unlawful. Where permitted by > > applicable law, this e-mail and other e-mail communications sent to and > > from Cognizant e-mail addresses may be monitored. > > This e-mail and any files transmitted with it are for the sole use of the > > intended recipient(s) and may contain confidential and privileged > > information. If you are not the intended
Re: Kafka topic partition distributing evenly on disks
I initially started with one data disk (mounted solely to hold Kafka data) and recently added a new one. On Thu, Aug 6, 2020 at 10:13 PM wrote: > What do you mean older disk ? > > On 8/6/20, 12:05 PM, "Péter Nagykátai" wrote: > > [External] > > > Yeah, but it doesn't do that. My "older" disks have ~70 partitions, the > newer ones ~5 partitions. That's why I'm asking what went wrong. > > On Thu, Aug 6, 2020 at 8:35 PM wrote: > > > Kafka evenly distributed number of partition on each disk so in > your case > > every disk should have 3/2 topic partitions . > > It is producer job to evenly produce data by partition key to topic > > partition . > > How it partition key , it is auto generated or producer sending key > along > > with message . > > > > > > On 8/6/20, 7:29 AM, "Péter Nagykátai" wrote: > > > > [External] > > > > > > Hello, > > > > I have a Kafka cluster with 3 brokers (v2.3.0) and each broker > has 2 > > disks > > attached. I added a new topic (heavyweight) and was surprised > that > > even if > > the topic has 15 partitions, those weren't distributed evenly on > the > > disks. > > Thus I got one disk that's almost empty and the other almost > filled > > up. Is > > there any way to have Kafka evenly distribute data on its disks? > > > > Thank you! > > > > > > This e-mail and any files transmitted with it are for the sole use > of the > > intended recipient(s) and may contain confidential and privileged > > information. If you are not the intended recipient(s), please reply > to the > > sender and destroy all copies of the original message. Any > unauthorized > > review, use, disclosure, dissemination, forwarding, printing or > copying of > > this email, and/or any action taken in reliance on the contents of > this > > e-mail is strictly prohibited and may be unlawful. Where permitted by > > applicable law, this e-mail and other e-mail communications sent to > and > > from Cognizant e-mail addresses may be monitored. > > This e-mail and any files transmitted with it are for the sole use > of the > > intended recipient(s) and may contain confidential and privileged > > information. If you are not the intended recipient(s), please reply > to the > > sender and destroy all copies of the original message. Any > unauthorized > > review, use, disclosure, dissemination, forwarding, printing or > copying of > > this email, and/or any action taken in reliance on the contents of > this > > e-mail is strictly prohibited and may be unlawful. Where permitted by > > applicable law, this e-mail and other e-mail communications sent to > and > > from Cognizant e-mail addresses may be monitored. > > > > > This e-mail and any files transmitted with it are for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient(s), please reply to the > sender and destroy all copies of the original message. Any unauthorized > review, use, disclosure, dissemination, forwarding, printing or copying of > this email, and/or any action taken in reliance on the contents of this > e-mail is strictly prohibited and may be unlawful. Where permitted by > applicable law, this e-mail and other e-mail communications sent to and > from Cognizant e-mail addresses may be monitored. > This e-mail and any files transmitted with it are for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient(s), please reply to the > sender and destroy all copies of the original message. Any unauthorized > review, use, disclosure, dissemination, forwarding, printing or copying of > this email, and/or any action taken in reliance on the contents of this > e-mail is strictly prohibited and may be unlawful. Where permitted by > applicable law, this e-mail and other e-mail communications sent to and > from Cognizant e-mail addresses may be monitored. >
Re: Kafka topic partition distributing evenly on disks
What do you mean older disk ? On 8/6/20, 12:05 PM, "Péter Nagykátai" wrote: [External] Yeah, but it doesn't do that. My "older" disks have ~70 partitions, the newer ones ~5 partitions. That's why I'm asking what went wrong. On Thu, Aug 6, 2020 at 8:35 PM wrote: > Kafka evenly distributed number of partition on each disk so in your case > every disk should have 3/2 topic partitions . > It is producer job to evenly produce data by partition key to topic > partition . > How it partition key , it is auto generated or producer sending key along > with message . > > > On 8/6/20, 7:29 AM, "Péter Nagykátai" wrote: > > [External] > > > Hello, > > I have a Kafka cluster with 3 brokers (v2.3.0) and each broker has 2 > disks > attached. I added a new topic (heavyweight) and was surprised that > even if > the topic has 15 partitions, those weren't distributed evenly on the > disks. > Thus I got one disk that's almost empty and the other almost filled > up. Is > there any way to have Kafka evenly distribute data on its disks? > > Thank you! > > > This e-mail and any files transmitted with it are for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient(s), please reply to the > sender and destroy all copies of the original message. Any unauthorized > review, use, disclosure, dissemination, forwarding, printing or copying of > this email, and/or any action taken in reliance on the contents of this > e-mail is strictly prohibited and may be unlawful. Where permitted by > applicable law, this e-mail and other e-mail communications sent to and > from Cognizant e-mail addresses may be monitored. > This e-mail and any files transmitted with it are for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient(s), please reply to the > sender and destroy all copies of the original message. Any unauthorized > review, use, disclosure, dissemination, forwarding, printing or copying of > this email, and/or any action taken in reliance on the contents of this > e-mail is strictly prohibited and may be unlawful. Where permitted by > applicable law, this e-mail and other e-mail communications sent to and > from Cognizant e-mail addresses may be monitored. > This e-mail and any files transmitted with it are for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient(s), please reply to the sender and destroy all copies of the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email, and/or any action taken in reliance on the contents of this e-mail is strictly prohibited and may be unlawful. Where permitted by applicable law, this e-mail and other e-mail communications sent to and from Cognizant e-mail addresses may be monitored. This e-mail and any files transmitted with it are for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient(s), please reply to the sender and destroy all copies of the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email, and/or any action taken in reliance on the contents of this e-mail is strictly prohibited and may be unlawful. Where permitted by applicable law, this e-mail and other e-mail communications sent to and from Cognizant e-mail addresses may be monitored.
Re: Kafka topic partition distributing evenly on disks
Yeah, but it doesn't do that. My "older" disks have ~70 partitions, the newer ones ~5 partitions. That's why I'm asking what went wrong. On Thu, Aug 6, 2020 at 8:35 PM wrote: > Kafka evenly distributed number of partition on each disk so in your case > every disk should have 3/2 topic partitions . > It is producer job to evenly produce data by partition key to topic > partition . > How it partition key , it is auto generated or producer sending key along > with message . > > > On 8/6/20, 7:29 AM, "Péter Nagykátai" wrote: > > [External] > > > Hello, > > I have a Kafka cluster with 3 brokers (v2.3.0) and each broker has 2 > disks > attached. I added a new topic (heavyweight) and was surprised that > even if > the topic has 15 partitions, those weren't distributed evenly on the > disks. > Thus I got one disk that's almost empty and the other almost filled > up. Is > there any way to have Kafka evenly distribute data on its disks? > > Thank you! > > > This e-mail and any files transmitted with it are for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient(s), please reply to the > sender and destroy all copies of the original message. Any unauthorized > review, use, disclosure, dissemination, forwarding, printing or copying of > this email, and/or any action taken in reliance on the contents of this > e-mail is strictly prohibited and may be unlawful. Where permitted by > applicable law, this e-mail and other e-mail communications sent to and > from Cognizant e-mail addresses may be monitored. > This e-mail and any files transmitted with it are for the sole use of the > intended recipient(s) and may contain confidential and privileged > information. If you are not the intended recipient(s), please reply to the > sender and destroy all copies of the original message. Any unauthorized > review, use, disclosure, dissemination, forwarding, printing or copying of > this email, and/or any action taken in reliance on the contents of this > e-mail is strictly prohibited and may be unlawful. Where permitted by > applicable law, this e-mail and other e-mail communications sent to and > from Cognizant e-mail addresses may be monitored. >
Re: Kafka topic partition distributing evenly on disks
Kafka evenly distributed number of partition on each disk so in your case every disk should have 3/2 topic partitions . It is producer job to evenly produce data by partition key to topic partition . How it partition key , it is auto generated or producer sending key along with message . On 8/6/20, 7:29 AM, "Péter Nagykátai" wrote: [External] Hello, I have a Kafka cluster with 3 brokers (v2.3.0) and each broker has 2 disks attached. I added a new topic (heavyweight) and was surprised that even if the topic has 15 partitions, those weren't distributed evenly on the disks. Thus I got one disk that's almost empty and the other almost filled up. Is there any way to have Kafka evenly distribute data on its disks? Thank you! This e-mail and any files transmitted with it are for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient(s), please reply to the sender and destroy all copies of the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email, and/or any action taken in reliance on the contents of this e-mail is strictly prohibited and may be unlawful. Where permitted by applicable law, this e-mail and other e-mail communications sent to and from Cognizant e-mail addresses may be monitored. This e-mail and any files transmitted with it are for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient(s), please reply to the sender and destroy all copies of the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email, and/or any action taken in reliance on the contents of this e-mail is strictly prohibited and may be unlawful. Where permitted by applicable law, this e-mail and other e-mail communications sent to and from Cognizant e-mail addresses may be monitored.
Kafka topic partition distributing evenly on disks
Hello, I have a Kafka cluster with 3 brokers (v2.3.0) and each broker has 2 disks attached. I added a new topic (heavyweight) and was surprised that even if the topic has 15 partitions, those weren't distributed evenly on the disks. Thus I got one disk that's almost empty and the other almost filled up. Is there any way to have Kafka evenly distribute data on its disks? Thank you!
