hadoop-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From " Marcos Ortiz Valmaseda" <mlor...@uci.cu>
Subject Re: hadoop - running examples
Date Thu, 08 Nov 2012 23:06:42 GMT
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 <dontariq@gmail.com>
Para: user@hadoop.apache.org
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 <jayunit100@gmail.com> 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 <dontariq@gmail.com> 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 <Andy.Kartashov@mpac.ca>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
>> NOTICE: This e-mail message and any attachments are confidential, subject
>> to copyright and may be privileged. Any unauthorized use, copying or
>> disclosure is prohibited. If you are not the intended recipient, please
>> delete and contact the sender immediately. Please consider the environment
>> before printing this e-mail. AVIS : le présent courriel et toute pièce
>> jointe qui l'accompagne sont confidentiels, protégés par le droit d'auteur
>> et peuvent être couverts par le secret professionnel. Toute utilisation,
>> copie ou divulgation non autorisée est interdite. Si vous n'êtes pas le
>> destinataire prévu de ce courriel, supprimez-le et contactez immédiatement
>> l'expéditeur. Veuillez penser à l'environnement avant d'imprimer le présent
>> courriel
>>
>
>




10mo. ANIVERSARIO DE LA CREACION DE LA UNIVERSIDAD DE LAS CIENCIAS INFORMATICAS...
CONECTADOS AL FUTURO, CONECTADOS A LA REVOLUCION

http://www.uci.cu
http://www.facebook.com/universidad.uci
http://www.flickr.com/photos/universidad_uci

Mime
View raw message