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From Cody Koeninger <c...@koeninger.org>
Subject Re: Rebalancing when adding kafka partitions
Date Fri, 12 Aug 2016 21:15:10 GMT
Hrrm, that's interesting. Did you try with subscribe pattern, out of
curiosity?

I haven't tested repartitioning on the  underlying new Kafka consumer, so
its possible I misunderstood something.
On Aug 12, 2016 2:47 PM, "Srikanth" <srikanth.ht@gmail.com> wrote:

> I did try a test with spark 2.0 + spark-streaming-kafka-0-10-assembly.
> Partition was increased using "bin/kafka-topics.sh --alter" after spark
> job was started.
> I don't see messages from new partitions in the DStream.
>
>     KafkaUtils.createDirectStream[Array[Byte], Array[Byte]] (
>>         ssc, PreferConsistent, Subscribe[Array[Byte],
>> Array[Byte]](topics, kafkaParams) )
>>     .map(r => (r.key(), r.value()))
>
>
> Also, no.of partitions did not increase too.
>
>>     dataStream.foreachRDD( (rdd, curTime) => {
>>      logger.info(s"rdd has ${rdd.getNumPartitions} partitions.")
>
>
> Should I be setting some parameter/config? Is the doc for new integ
> available?
>
> Thanks,
> Srikanth
>
> On Fri, Jul 22, 2016 at 2:15 PM, Cody Koeninger <cody@koeninger.org>
> wrote:
>
>> No, restarting from a checkpoint won't do it, you need to re-define the
>> stream.
>>
>> Here's the jira for the 0.10 integration
>>
>> https://issues.apache.org/jira/browse/SPARK-12177
>>
>> I haven't gotten docs completed yet, but there are examples at
>>
>> https://github.com/koeninger/kafka-exactly-once/tree/kafka-0.10
>>
>> On Fri, Jul 22, 2016 at 1:05 PM, Srikanth <srikanth.ht@gmail.com> wrote:
>> > In Spark 1.x, if we restart from a checkpoint, will it read from new
>> > partitions?
>> >
>> > If you can, pls point us to some doc/link that talks about Kafka 0.10
>> integ
>> > in Spark 2.0.
>> >
>> > On Fri, Jul 22, 2016 at 1:33 PM, Cody Koeninger <cody@koeninger.org>
>> wrote:
>> >>
>> >> For the integration for kafka 0.8, you are literally starting a
>> >> streaming job against a fixed set of topicapartitions,  It will not
>> >> change throughout the job, so you'll need to restart the spark job if
>> >> you change kafka partitions.
>> >>
>> >> For the integration for kafka 0.10 / spark 2.0, if you use subscribe
>> >> or subscribepattern, it should pick up new partitions as they are
>> >> added.
>> >>
>> >> On Fri, Jul 22, 2016 at 11:29 AM, Srikanth <srikanth.ht@gmail.com>
>> wrote:
>> >> > Hello,
>> >> >
>> >> > I'd like to understand how Spark Streaming(direct) would handle Kafka
>> >> > partition addition?
>> >> > Will a running job be aware of new partitions and read from it?
>> >> > Since it uses Kafka APIs to query offsets and offsets are handled
>> >> > internally.
>> >> >
>> >> > Srikanth
>> >
>> >
>>
>
>

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