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From Adrian Landman <adrian.land...@gmail.com>
Subject Re: Bolt vs Spout
Date Tue, 29 Jul 2014 12:11:53 GMT
I feel like you missed the issue in my question.  For the connection string
for ZkHosts, if I pass in localhost:9092 with a default kafka
configuration, it won't connect.  Instead I have to pass in localhost:2181.
 Is this expected behavior?  Also, if I wanted to pass in more than one
host, what should separate the entries?  Commas?


On Mon, Jul 28, 2014 at 4:17 PM, Parth Brahmbhatt <
pbrahmbhatt@hortonworks.com> wrote:

> For setting a list of brokers in kafkaSpout, I believe there are 2 options:
>
> If you use StaticHosts then you need to add GlobalPartitionInformation in
> which you have to specify each partition and its corresponding broker host
>
> GlobalPartitionInformation partitions = new GlobalPartitionInformation();
> partitions.addPartition(0,new Broker("10.22.2.79", 9092));
> //add more partitions here.
> BrokerHosts hosts = new StaticHosts(partitions);
>
> Alternatively, If you use ZkHosts then you need to pass in the complete
> zookeeper connection string e.g. lolcalhost:9092 , optionally there is a
> constructor that allows you to specify a second argument which is zkroot ,
> by default it is set to /brokers which should work with default kafka
> installation. The code in ZlHosts looks under zkroot/topics/<topic that you
> set in SpoutConfig>/partitions to figure out the number of partitions and
> leader for each partition.
>
> Thanks
> Parth
>
>
>
>
> On Mon, Jul 28, 2014 at 9:54 AM, Adrian Landman <adrian.landman@gmail.com>
> wrote:
>
>> I am writing a topology that pulls messages from a topic, does some work,
>> and then writes them back on a different topic.  I have been having some
>> issues so I created my own small topology that just pulls a message, prints
>> the contents, and then stores them back on a new topic.  I finally got this
>> to work, but it raised a question.
>>
>> To create the spout I need to either pass in the kafka location sans port
>> (e.g. localhost) or use 2181 as the port.
>>
>> To create the producer bolt I need to pass in the broker port (e.g. 9092)
>> or I get an array out of bounds exception when creating the Producer.
>>
>> When we were using kafka7 and
>>
>> https://github.com/nathanmarz/storm-contrib/tree/master/storm-kafka/src/jvm/storm/kafka
>> for our storm/kafka integration I believe that we used the same broker
>> list for both our spout and our producer.  Is there anyway to do the same
>> with kafka8 and the new storm-kafka project?  Also, if w want to pass in a
>> list, I know that in the KafkaBolt we can set metadata.broker.list to a
>> comma separated list of brokers (1.1.1.1:9092, 1.1.1.2:9092) but can we
>> do the same for the spout?  Or is there any reason to?  ZkHost takes in a
>> String, but I didn't see anything that specified the format.
>>
>
>
>
> --
> Thanks
> Parth
>
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