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Kafka, mail # user - partition reassignment


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Re: partition reassignment
Kane Kane 2013-10-16, 07:16
Oh i see, what is the better way to initiate the leader change? As I told
somehow all my partitions have the same leader for some reason. I have 3
brokers and all partitions have leader on single one.
On Wed, Oct 16, 2013 at 12:04 AM, Joel Koshy <[EMAIL PROTECTED]> wrote:

> For a leader change yes, but this is partition reassignment which
> completes when all the reassigned replicas are in sync with the
> original replica(s). You can check the status of the command using the
> option I mentioned earlier.
>
> On Tue, Oct 15, 2013 at 7:02 PM, Kane Kane <[EMAIL PROTECTED]> wrote:
> > I thought if i have all replicas in sync, leader change should be much
> > faster?
> >
> >
> > On Tue, Oct 15, 2013 at 5:12 PM, Joel Koshy <[EMAIL PROTECTED]> wrote:
> >
> >> Depending on how much data there is in those partitions it can take a
> >> while for reassignment to actually complete. You will need to use the
> >> --status-check-json-file option of the reassign partitions command to
> >> determine whether partition reassignment has completed or not.
> >>
> >> Joel
> >>
> >>
> >> On Tue, Oct 15, 2013 at 3:46 PM, Kane Kane <[EMAIL PROTECTED]>
> wrote:
> >> > I have 3 brokers and a topic with replication factor of 3.
> >> > Somehow all partitions ended up being on the same broker.
> >> > I've created topic with 3 brokers alive, and they didn't die since
> then.
> >> >
> >> > Even when i try to reassign it:
> >> > bin/kafka-reassign-partitions.sh --zookeeper
> >> > 10.80.42.147:2181--broker-list 0,1,2 --topics-to-move-json-file
> >> > ~/reassign.txt --execute
> >> >
> >> > The leader of all partitions after that is still the single broker
> (first
> >> > one).
> >> > This is how my json file looks like:
> >> > {"topics":
> >> >                                             [{"topic": "perf1"}],
> >> >                                         "version":1
> >> >                                         }
> >> >
> >> > The command reports success:
> >> > Successfully started reassignment of partitions Map([perf1,33] ->
> List(1,
> >> > 0, 2), [perf1,13] -> List(2, 0, 1), [perf1,28] -> List(2, 1, 0),
> >> [perf1,20]
> >> > -> List(0, 1, 2), [perf1,5] -> List(0, 2, 1), [perf1,14] -> List(0, 1,
> >> 2),
> >> > [perf1,39] -> List(1, 0, 2), [perf1,19] -> List(2, 0, 1), [perf1,25]
> ->
> >> > List(2, 0, 1), [perf1,43] -> List(2, 0, 1), [perf1,11] -> List(0, 2,
> 1),
> >> > [perf1,8] -> List(0, 1, 2), [perf1,22] -> List(2, 1, 0), [perf1,16] ->
> >> > List(2, 1, 0), [perf1,26] -> List(0, 1, 2), [perf1,41] -> List(0, 2,
> 1),
> >> > [perf1,9] -> List(1, 0, 2), [perf1,27] -> List(1, 0, 2), [perf1,44] ->
> >> > List(0, 1, 2), [perf1,34] -> List(2, 1, 0), [perf1,6] -> List(1, 2,
> 0),
> >> > [perf1,1] -> List(2, 0, 1), [perf1,37] -> List(2, 0, 1), [perf1,24] ->
> >> > List(1, 2, 0), [perf1,29] -> List(0, 2, 1), [perf1,32] -> List(0, 1,
> 2),
> >> > [perf1,7] -> List(2, 0, 1), [perf1,17] -> List(0, 2, 1), [perf1,36] ->
> >> > List(1, 2, 0), [perf1,0] -> List(1, 2, 0), [perf1,42] -> List(1, 2,
> 0),
> >> > [perf1,4] -> List(2, 1, 0), [perf1,10] -> List(2, 1, 0), [perf1,30] ->
> >> > List(1, 2, 0), [perf1,23] -> List(0, 2, 1), [perf1,18] -> List(1, 2,
> 0),
> >> > [perf1,3] -> List(1, 0, 2), [perf1,35] -> List(0, 2, 1), [perf1,31] ->
> >> > List(2, 0, 1), [perf1,12] -> List(1, 2, 0), [perf1,2] -> List(0, 1,
> 2),
> >> > [perf1,40] -> List(2, 1, 0), [perf1,38] -> List(0, 1, 2), [perf1,15]
> ->
> >> > List(1, 0, 2), [perf1,21] -> List(1, 0, 2))
> >> >
> >> > But still nothing changes. I use ~/kafka-src/bin/kafka-topics.sh
> >> > --zookeeper 10.80.42.147:2181 --describe --topic perf1 to check
> leaders.
> >> >
> >> > Thanks.
> >>
>