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MapReduce >> mail # user >> hadoop - running examples


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Kartashov, Andy 2012-11-08, 21:48
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Mohammad Tariq 2012-11-08, 22:27
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Jay Vyas 2012-11-08, 22:31
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Mohammad Tariq 2012-11-08, 22:33
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Re: hadoop - running examples
Mohammad is right.
When you write a file to HDFS, it can´t be modified.
The pattern in HDFS is write-one/read-many-times.

If you want to use a distribution where you can read and write files, you should take a look
to MapR distribution.

----- Mensaje original -----
De: Mohammad Tariq <[EMAIL PROTECTED]>
Para: [EMAIL PROTECTED]
Enviado: Thu, 08 Nov 2012 17:33:56 -0500 (CST)
Asunto: Re: hadoop - running examples

Apologies for the wrong word. Yes, I meant non modifiable.

Regards,
    Mohammad Tariq

On Fri, Nov 9, 2012 at 4:01 AM, Jay Vyas <[EMAIL PROTECTED]> wrote:

> What do you mean immutable? Do u mean non modifiable maybe .?  Immutable
> implies that they can't be deleted .
>
> Jay Vyas
> MMSB
> UCHC
>
> On Nov 8, 2012, at 5:28 PM, Mohammad Tariq <[EMAIL PROTECTED]> wrote:
>
> Files are immutable, once written into the Hdfs. And touchz creates a file
> of 0 length.
>
> Regards,
>     Mohammad Tariq
>
>
>
> On Fri, Nov 9, 2012 at 3:18 AM, Kartashov, Andy <[EMAIL PROTECTED]>wrote:
>
>> Guys,
>>
>> When running examples, you bring them into HDFS. Say, you need to make
>> some correction to a file, you need to make them on local FS and run
>> $hadoop fs -put ... again. You cannot just make changes to files inside
>> HDFS except for "touchz" a file, correct?
>>
>> Just making sure.
>>
>> Thnx,
>> AK
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Andy Isaacson 2012-11-08, 23:33