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From Jun Rao <jun...@gmail.com>
Subject Re: General questions on functionality and usage
Date Fri, 02 Dec 2011 01:29:05 GMT
No, multiple servers in each cluster.

Jun

On Thu, Dec 1, 2011 at 4:48 PM, Mark <static.void.dev@gmail.com> wrote:

> So at linked in you only use 1 kafka server?
>
>
> On 12/1/11 9:12 AM, Jun Rao wrote:
>
>> Mark,
>>
>> See my inlined answers below.
>>
>> Thanks,
>>
>> Jun
>>
>> On Thu, Dec 1, 2011 at 8:28 AM, Mark<static.void.dev@gmail.com**>  wrote:
>>
>>  - Does Kafka support pattern matching?
>>>
>>>  There is no server-side filtering in Kafka right now.
>>
>>
>>  - What are the limitations of one Kafka server in terms of number of
>>> topics and number of consumers?
>>>
>>>  There is no hard limit. However, at LinkedIn, we are dealing with
>> hundreds
>> of topics and tens of consumers. Large # of topics/consumers could be
>> limited by ZK capacity and OS capacity (e.g., open file handlers). Also,
>> if
>> a consumer consumes a large number of topics, time to balance load will be
>> longer.
>>
>>
>>  - Can you load balance publishing/subscribing across multiple Kafka
>>> servers to increase redundancy?
>>>
>>>
>>>  It's possible, but it's not something that's built-in now. We do plan to
>> support intra-cluster replication. See the design in
>> https://issues.apache.org/**jira/browse/KAFKA-50<https://issues.apache.org/jira/browse/KAFKA-50>
>>
>>
>>  - Other than lack of map/reduce support how does Kafka differ than say
>>> Redis Pub/Sub? (http://redis.io/topics/**pubsub**<http://redis.io/topics/pubsub**>
>>> )
>>>
>>>
>>>  Don't know about Redis Pub/Sub. However, Kafka differs from some other
>> pub/sub/messaging systems in that it focuses more on scalability,
>> efficiency, and throughput.
>>
>>
>>  - Would anyone mind sharing their Kafka setup in terms of both
>>> functionality/usage and architecture... basically more in depth than the
>>> usual "Kafka servers our realt-time X" (https://cwiki.apache.org/**
>>> confluence/display/KAFKA/****Powered+By<https://cwiki.**
>>> apache.org/confluence/display/**KAFKA/Powered+By<https://cwiki.apache.org/confluence/display/KAFKA/Powered+By>
>>> >).
>>>
>>> Having concrete use cases on the wiki could help gain adoption,
>>> especially
>>> to new users of the pub/sub paradigm, by showing what the powers of
>>> pub/sub
>>> real-time messaging can accomplish.
>>>
>>>
>>>  Yes, we will update the wiki later.
>>
>>
>>  - Any good papers on what problems pub/sub in general can solve?
>>>
>>>
>>>  Some of the design and usage of Kafka can be found in this paper:
>> http://research.microsoft.com/**en-us/um/people/srikanth/**
>> netdb11/netdb11papers/netdb11-**final12.pdf<http://research.microsoft.com/en-us/um/people/srikanth/netdb11/netdb11papers/netdb11-final12.pdf>
>>
>>
>> Thanks
>>
>>>
>>>
>>>
>>>

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