For whatever is worth and from memory
In previous client versions (may have been fixed in 0.11), we had 3 consumers 
in the same consumer group, when a topic partition reassignment happened and 2 
consumers had partitions and but the other one did not get any. So you could be 
in that scenario but you would need to check your metrics (assigned partitions) 
- it is possible for all consumers to get in that state.
However, to be more specific to mirrormaker, we saw mirrormaker shutting itself 
down (there is a setting to do that when a problem occurs, not sure if this is 
the default behaviour and I am not sure of  your config) when it goes in some 
state where it is still there but doing nothing does not die 
properly.Currently, we unfortunately restart mirrormaker pre-emptively every 3 
hours because we haven't had the time to look into it any further. However, 
there was evidence in the mirror maker logs that it was trying to shutdown.
These are the two cases I remember where mirror maker could get in that state.


    On Friday, April 6, 2018 9:10 PM, Jeff Field <> wrote:

 I'm hitting the same problem, even with the new consumer, on MirrorMaker 0.9 
reading from a 0.9 Kafka cluster and producing to a 0.11 Kafka cluster.

On 3/30/18, 3:56 PM, "Andrew Otto" <> wrote:

    I’m currently stuck on MirrorMaker version 0.9, and I’m not sure when the
    new consumer client became the default.  Does your 0.10 version have a
    —new.consumer option listed in the help message?  If so, then the new
    consumer client is not the default.  I haven’t seen the problem you are
    describing (I’m still having plenty of others though) since I’ve switched
    to using the new consumer.
    Another thought, what is the value of your partition.assignment.strategy?
    I’ve found round robin (default in later versions of MirrorMaker) to be a
    lot more consistent than whatever the default is in 0.9.  Not sure what the
    default in 0.10 is.
    On Fri, Mar 30, 2018 at 11:40 AM, Siva A <> wrote:
    > Any other update on this?
    > On Mon, Mar 26, 2018, 7:42 PM Andrew Otto <> wrote:
    > > I’ve had similar problems, but I don’t have an explanation for ya :/
    > >
    > > On Sun, Mar 25, 2018 at 12:19 PM, Siva A <>
    > wrote:
    > >
    > > > Hi,
    > > >
    > > > We have 3 nodes Kafka cluster( and its mirroring the data 
    > > > another 3 node cluster of same Kafka version.
    > > > Both the clusters are Kerberized and we are running the Mirrormaker on
    > > the
    > > > target cluster using the single principal/keytab with the one way 
    > > on
    > > > the KDC.
    > > >
    > > > At times, the mirrormaker stops functioning(Doesn't mirror the data)
    > but
    > > > the process is still running. If we restart the service then it works
    > > fine
    > > > for a day or so.
    > > >
    > > > I don't see any error on the Kafka logs as well.
    > > > Is there anyone seen this kind of issue?
    > > >
    > > > Thanks
    > > > Siva
    > > >
    > >


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