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Posted to common-user@hadoop.apache.org by unmesha sreeveni <un...@gmail.com> on 2013/11/05 12:15:39 UTC
which is better : form reducer or Driver
I am emiting 'A' value and 'B' value from reducer.
I need to do further calculations also.
which is a better way?
1. Do all remamining computations within reducer , after emiting
or
2.Do remaining computation In driver: read A and B value from part file and
do further computations.
Pls suggest a better way.
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
ok i will check them in both ways :)
On Wed, Nov 6, 2013 at 2:10 PM, Chris Mawata <ch...@gmail.com> wrote:
> Try it both ways and look at the numbers. Measurement is the ultimate
> way to get the answer.
> My bet: The difference is so small I would worry about where if makes your
> code more maintainable than tuning before coding.
> Chris
>
>
>
> On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
>
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com>wrote:
>
>> If you have multiple reducers you are doing it in parallel while in the
>> driver it is surely single threaded so my bet would be on the reducers.
>>
>> Chris
>>
>>
>> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>>
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from part file
>> and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> *Thanks & Regards*
>>
>> Unmesha Sreeveni U.B
>>
>> *Junior Developer *
>>
>> *Amrita Center For Cyber Security *
>>
>>
>> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>>
>>
>>
>
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
ok i will check them in both ways :)
On Wed, Nov 6, 2013 at 2:10 PM, Chris Mawata <ch...@gmail.com> wrote:
> Try it both ways and look at the numbers. Measurement is the ultimate
> way to get the answer.
> My bet: The difference is so small I would worry about where if makes your
> code more maintainable than tuning before coding.
> Chris
>
>
>
> On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
>
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com>wrote:
>
>> If you have multiple reducers you are doing it in parallel while in the
>> driver it is surely single threaded so my bet would be on the reducers.
>>
>> Chris
>>
>>
>> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>>
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from part file
>> and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> *Thanks & Regards*
>>
>> Unmesha Sreeveni U.B
>>
>> *Junior Developer *
>>
>> *Amrita Center For Cyber Security *
>>
>>
>> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>>
>>
>>
>
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
ok i will check them in both ways :)
On Wed, Nov 6, 2013 at 2:10 PM, Chris Mawata <ch...@gmail.com> wrote:
> Try it both ways and look at the numbers. Measurement is the ultimate
> way to get the answer.
> My bet: The difference is so small I would worry about where if makes your
> code more maintainable than tuning before coding.
> Chris
>
>
>
> On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
>
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com>wrote:
>
>> If you have multiple reducers you are doing it in parallel while in the
>> driver it is surely single threaded so my bet would be on the reducers.
>>
>> Chris
>>
>>
>> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>>
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from part file
>> and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> *Thanks & Regards*
>>
>> Unmesha Sreeveni U.B
>>
>> *Junior Developer *
>>
>> *Amrita Center For Cyber Security *
>>
>>
>> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>>
>>
>>
>
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
ok i will check them in both ways :)
On Wed, Nov 6, 2013 at 2:10 PM, Chris Mawata <ch...@gmail.com> wrote:
> Try it both ways and look at the numbers. Measurement is the ultimate
> way to get the answer.
> My bet: The difference is so small I would worry about where if makes your
> code more maintainable than tuning before coding.
> Chris
>
>
>
> On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
>
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com>wrote:
>
>> If you have multiple reducers you are doing it in parallel while in the
>> driver it is surely single threaded so my bet would be on the reducers.
>>
>> Chris
>>
>>
>> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>>
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from part file
>> and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> *Thanks & Regards*
>>
>> Unmesha Sreeveni U.B
>>
>> *Junior Developer *
>>
>> *Amrita Center For Cyber Security *
>>
>>
>> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>>
>>
>>
>
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
Try it both ways and look at the numbers. Measurement is the ultimate
way to get the answer.
My bet: The difference is so small I would worry about where if makes
your code more maintainable than tuning before coding.
Chris
On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <chris.mawata@gmail.com
> <ma...@gmail.com>> wrote:
>
> If you have multiple reducers you are doing it in parallel while
> in the driver it is surely single threaded so my bet would be on
> the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from
>> part file and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> /Thanks & Regards/
>> /
>> /
>> Unmesha Sreeveni U.B/
>> /
>> /Junior Developer
>> /
>> /Amrita Center For Cyber Security
>> /
>> /
>> Amritapuri.
>>
>> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
>> /
>
>
>
>
> --
> /Thanks & Regards/
> /
> /
> Unmesha Sreeveni U.B/
> /
> /Junior Developer
> /
> /Amrita Center For Cyber Security
> /
> /
> Amritapuri.
>
> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
> /
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
Try it both ways and look at the numbers. Measurement is the ultimate
way to get the answer.
My bet: The difference is so small I would worry about where if makes
your code more maintainable than tuning before coding.
Chris
On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <chris.mawata@gmail.com
> <ma...@gmail.com>> wrote:
>
> If you have multiple reducers you are doing it in parallel while
> in the driver it is surely single threaded so my bet would be on
> the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from
>> part file and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> /Thanks & Regards/
>> /
>> /
>> Unmesha Sreeveni U.B/
>> /
>> /Junior Developer
>> /
>> /Amrita Center For Cyber Security
>> /
>> /
>> Amritapuri.
>>
>> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
>> /
>
>
>
>
> --
> /Thanks & Regards/
> /
> /
> Unmesha Sreeveni U.B/
> /
> /Junior Developer
> /
> /Amrita Center For Cyber Security
> /
> /
> Amritapuri.
>
> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
> /
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
Try it both ways and look at the numbers. Measurement is the ultimate
way to get the answer.
My bet: The difference is so small I would worry about where if makes
your code more maintainable than tuning before coding.
Chris
On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <chris.mawata@gmail.com
> <ma...@gmail.com>> wrote:
>
> If you have multiple reducers you are doing it in parallel while
> in the driver it is surely single threaded so my bet would be on
> the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from
>> part file and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> /Thanks & Regards/
>> /
>> /
>> Unmesha Sreeveni U.B/
>> /
>> /Junior Developer
>> /
>> /Amrita Center For Cyber Security
>> /
>> /
>> Amritapuri.
>>
>> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
>> /
>
>
>
>
> --
> /Thanks & Regards/
> /
> /
> Unmesha Sreeveni U.B/
> /
> /Junior Developer
> /
> /Amrita Center For Cyber Security
> /
> /
> Amritapuri.
>
> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
> /
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
Try it both ways and look at the numbers. Measurement is the ultimate
way to get the answer.
My bet: The difference is so small I would worry about where if makes
your code more maintainable than tuning before coding.
Chris
On 11/5/2013 9:59 PM, unmesha sreeveni wrote:
> i am dealing with multiple mappers and 1 reducer. so which is best?
>
>
> On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <chris.mawata@gmail.com
> <ma...@gmail.com>> wrote:
>
> If you have multiple reducers you are doing it in parallel while
> in the driver it is surely single threaded so my bet would be on
> the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>> I am emiting 'A' value and 'B' value from reducer.
>>
>> I need to do further calculations also.
>> which is a better way?
>> 1. Do all remamining computations within reducer , after emiting
>> or
>> 2.Do remaining computation In driver: read A and B value from
>> part file and do further computations.
>>
>> Pls suggest a better way.
>>
>> --
>> /Thanks & Regards/
>> /
>> /
>> Unmesha Sreeveni U.B/
>> /
>> /Junior Developer
>> /
>> /Amrita Center For Cyber Security
>> /
>> /
>> Amritapuri.
>>
>> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
>> /
>
>
>
>
> --
> /Thanks & Regards/
> /
> /
> Unmesha Sreeveni U.B/
> /
> /Junior Developer
> /
> /Amrita Center For Cyber Security
> /
> /
> Amritapuri.
>
> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
> /
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
i am dealing with multiple mappers and 1 reducer. so which is best?
On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com> wrote:
> If you have multiple reducers you are doing it in parallel while in the
> driver it is surely single threaded so my bet would be on the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part file
> and do further computations.
>
> Pls suggest a better way.
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
i am dealing with multiple mappers and 1 reducer. so which is best?
On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com> wrote:
> If you have multiple reducers you are doing it in parallel while in the
> driver it is surely single threaded so my bet would be on the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part file
> and do further computations.
>
> Pls suggest a better way.
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
i am dealing with multiple mappers and 1 reducer. so which is best?
On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com> wrote:
> If you have multiple reducers you are doing it in parallel while in the
> driver it is surely single threaded so my bet would be on the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part file
> and do further computations.
>
> Pls suggest a better way.
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by unmesha sreeveni <un...@gmail.com>.
i am dealing with multiple mappers and 1 reducer. so which is best?
On Tue, Nov 5, 2013 at 6:28 PM, Chris Mawata <ch...@gmail.com> wrote:
> If you have multiple reducers you are doing it in parallel while in the
> driver it is surely single threaded so my bet would be on the reducers.
>
> Chris
>
>
> On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
>
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part file
> and do further computations.
>
> Pls suggest a better way.
>
> --
> *Thanks & Regards*
>
> Unmesha Sreeveni U.B
>
> *Junior Developer *
>
> *Amrita Center For Cyber Security *
>
>
> * Amritapuri. www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/> *
>
>
>
--
*Thanks & Regards*
Unmesha Sreeveni U.B
*Junior Developer*
*Amrita Center For Cyber Security*
* Amritapuri.www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>*
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
If you have multiple reducers you are doing it in parallel while in the
driver it is surely single threaded so my bet would be on the reducers.
Chris
On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part
> file and do further computations.
>
> Pls suggest a better way.
>
> --
> /Thanks & Regards/
> /
> /
> Unmesha Sreeveni U.B/
> /
> /Junior Developer
> /
> /Amrita Center For Cyber Security
> /
> /
> Amritapuri.
>
> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
> /
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
If you have multiple reducers you are doing it in parallel while in the
driver it is surely single threaded so my bet would be on the reducers.
Chris
On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part
> file and do further computations.
>
> Pls suggest a better way.
>
> --
> /Thanks & Regards/
> /
> /
> Unmesha Sreeveni U.B/
> /
> /Junior Developer
> /
> /Amrita Center For Cyber Security
> /
> /
> Amritapuri.
>
> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
> /
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
If you have multiple reducers you are doing it in parallel while in the
driver it is surely single threaded so my bet would be on the reducers.
Chris
On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part
> file and do further computations.
>
> Pls suggest a better way.
>
> --
> /Thanks & Regards/
> /
> /
> Unmesha Sreeveni U.B/
> /
> /Junior Developer
> /
> /Amrita Center For Cyber Security
> /
> /
> Amritapuri.
>
> www.amrita.edu/cyber/ <http://www.amrita.edu/cyber/>
> /
Re: which is better : form reducer or Driver
Posted by Chris Mawata <ch...@gmail.com>.
If you have multiple reducers you are doing it in parallel while in the
driver it is surely single threaded so my bet would be on the reducers.
Chris
On 11/5/2013 6:15 AM, unmesha sreeveni wrote:
> I am emiting 'A' value and 'B' value from reducer.
>
> I need to do further calculations also.
> which is a better way?
> 1. Do all remamining computations within reducer , after emiting
> or
> 2.Do remaining computation In driver: read A and B value from part
> file and do further computations.
>
> Pls suggest a better way.
>
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> Unmesha Sreeveni U.B/
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> Amritapuri.
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