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" <william.reyno...@instaclustr.com>
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%2Bdirectories&data=02%7C01%7CManoj.Agrawal2%40cognizant.com%7C3c313758d6c44da817ac08d83ad8262f%7Cde08c40719b9427d9fe8edf254300ca7%7C0%7C0%7C637324047321152477&sdata=tTYPxMp%2FmZ9ufSXQqY%2FbDwAIAG4ZNxRrc7fFq3EEvSg%3D&reserved=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 <st4r.f1...@gmail.com> 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_automigrate&data=02%7C01%7CManoj.Agrawal2%40cognizant.com%7C3c313758d6c44da817ac08d83ad8262f%7Cde08c40719b9427d9fe8edf254300ca7%7C0%7C0%7C637324047321162468&sdata=yWH5xhV8GXsTAOubFU1QmkuMlChpx6DVNe%2BKPpe5bwk%3D&reserved=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 <st4r.f1...@gmail.com> 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
>> > <songyingsh...@gmail.com>
>> > 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 <vinicius.scheideg...@gmail.com> 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
>> >> > <st4r.f1...@gmail.com
>> >
>> >> > 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 <manoj.agraw...@cognizant.com>
>> wrote:
>> >> > >
>> >> > > > What do you mean older disk ?
>> >> > > >
>> >> > > > On 8/6/20, 12:05 PM, "Péter Nagykátai" <st4r.f1...@gmail.com>
>> >> 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
>> >> > > > <manoj.agraw...@cognizant.com>
>> >> > 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"
>> >> > > > <st4r.f1...@gmail.com
>> >
>> >> > > 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!
>> >> > > > >
>> >> > > > >
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>>
>> --
>>
>>
>>
>> *William Reynolds**Technical Operations Engineer*
>>
>>
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