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From Ashwin Shankar <ashwinshanka...@gmail.com>
Subject Re: Differences between HistoryServer and Yarn TimeLine server?
Date Fri, 25 Apr 2014 06:11:34 GMT
Thanks Zhijie !
I had few more questions  :
1. I played around with the timeline server ui today which showed the
generic application history details,
but I couldn't find any page for application specific data. Is the
expectation that every application
needs to build their own UI using the exposed REST apis and somehow install
it with timeline server ?
Or am I missing something.
2. Are there REST apis for accessing both generic and framework specific
data in 2.4.0 ?
3. Is there an approximate timeframe for timeline server to be feature
complete ?
4. Tez doesn't have any job history UI,is there any work being done to
integrate Tez with timeline server ?
If not,is the timeline server ready for such integration in case someone
wants to pick this up ?

Thanks,
Ashwin



On Thu, Apr 24, 2014 at 12:00 AM, Zhijie Shen <zshen@hortonworks.com> wrote:

> Ashwin,
>
> YARN-321 focuses on the issue in the scope of generic application history
> service, while YARN-1530 covers the framework specific data service. And
> yes, the timeline server is going to cover both.
>
> We've not such a Jira before, but it is described in YARN-321's design
> doc. Anyway, I open a Jira (MAPREDUCE-5858) to track this issue.
>
>
> On Wed, Apr 23, 2014 at 11:25 PM, Ashwin Shankar <
> ashwinshankar77@gmail.com> wrote:
>
>> Hi Zhijie,
>> There seems to two umbrella jiras for this - YARN-321 and YARN-1530,can
>> you please let me know what is the
>> difference ? Is timeline server finally going to be YARN321+YARN1530 ?
>>
>> You mentioned that MR is going to integrated with timeline server,is
>> there a jira I can watch ?
>>
>> Thanks,
>> Ashwin
>>
>>
>> On Wed, Apr 23, 2014 at 10:15 PM, Zhijie Shen <zshen@hortonworks.com>wrote:
>>
>>> Sam,
>>>
>>> You're right. We can definitely integrate MapReduce to use the timeline
>>> server to store and serve its specific data, and this is actually our plan.
>>>
>>> However, it's a big move, and we still need time to get it done. In
>>> addition, not to disturb the users that are currently relying on JHS for MR
>>> job information, we cannot simply remove JHS from Hadoop.
>>>
>>>
>>> On Wed, Apr 23, 2014 at 8:15 PM, sam liu <samliuhadoop@gmail.com> wrote:
>>>
>>>> Zhijie,
>>>>
>>>> I am much clear now. Thanks a lot!
>>>>
>>>> As my understanding, besides previous Job History Server, hadoop now
>>>> has a new timeline server which could restore both the generic YARN
>>>> application history and the framework specific information. However, I
>>>> think the timeline server also include the functions of Job History Server,
>>>> because it can store the framework specific information(of course, include
>>>> mapreduce framework). In another words, Job History Server is not necessary
>>>> any more.* If that's the case, why hadoop still include Job History
>>>> Server?*
>>>>
>>>>
>>>> 2014-04-23 12:56 GMT+08:00 Zhijie Shen <zshen@hortonworks.com>:
>>>>
>>>>>  In Hadoop 2.4, we have delivered the timeline server at a preview
>>>>> stage, which actually can serve some generic YARN application history
as
>>>>> well as the framework specific information. Due to the development
>>>>> logistics, we have created the two concepts: History Server and Timeline
>>>>> Server. To be simple, you can consider the history server of the service
of
>>>>> the generic YARN application information, while consider the timeline
>>>>> server of the service of the framework specific information. Importantly,
>>>>> we just have one daemon, which includes both services, and which we'd
like
>>>>> to call timeline server (unfortunately, the confusing thing is that the
>>>>> command to start the daemon is "historyserver"). We're going on working
on
>>>>> the timeline server to integrate these two parts, including refactoring
the
>>>>> names.
>>>>>
>>>>> BTW, if you mean MapReduce JobHistoryServer by HistoryServer, it's a
>>>>> different daemon, which serves the historic information of MapReduce
jobs
>>>>> only.
>>>>>
>>>>>
>>>>> On Tue, Apr 22, 2014 at 8:44 PM, sam liu <samliuhadoop@gmail.com>wrote:
>>>>>
>>>>>> Hi Experts,
>>>>>>
>>>>>> I am confusing on these two concepts. Could you help explain the
>>>>>> differences?
>>>>>>
>>>>>> Thanks!
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Zhijie Shen
>>>>> Hortonworks Inc.
>>>>> http://hortonworks.com/
>>>>>
>>>>> CONFIDENTIALITY NOTICE
>>>>> NOTICE: This message is intended for the use of the individual or
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>>>>> If the reader of this message is not the intended recipient, you are
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>>>>> notified that any printing, copying, dissemination, distribution,
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If
>>>>> you have received this communication in error, please contact the sender
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>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Zhijie Shen
>>> Hortonworks Inc.
>>> http://hortonworks.com/
>>>
>>> CONFIDENTIALITY NOTICE
>>> NOTICE: This message is intended for the use of the individual or entity
>>> to which it is addressed and may contain information that is confidential,
>>> privileged and exempt from disclosure under applicable law. If the reader
>>> of this message is not the intended recipient, you are hereby notified that
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>>>
>>
>>
>>
>> --
>> Thanks,
>> Ashwin
>>
>>
>>
>
>
> --
> Zhijie Shen
> Hortonworks Inc.
> http://hortonworks.com/
>
> CONFIDENTIALITY NOTICE
> NOTICE: This message is intended for the use of the individual or entity
> to which it is addressed and may contain information that is confidential,
> privileged and exempt from disclosure under applicable law. If the reader
> of this message is not the intended recipient, you are hereby notified that
> any printing, copying, dissemination, distribution, disclosure or
> forwarding of this communication is strictly prohibited. If you have
> received this communication in error, please contact the sender immediately
> and delete it from your system. Thank You.
>



-- 
Thanks,
Ashwin

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