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Date: Thu, 08 Nov 2012 18:06:42 -0500 (CST)
From: " Marcos Ortiz Valmaseda" <mlortiz@uci.cu>
To: dontariq@gmail.com
Cc: user@hadoop.apache.org
Subject: Re: hadoop - running examples
Message-ID: <54b98ea0-6874-4e92-8580-d23bea6de912@ucimail4.uci.cu>
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 <CAMVC6RMNCy=4ExKMReSSUwrN80+vfO=g6WVZAQJ0QkRnAHymsg@mail.gmail.com>
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Mohammad is right.
When you write a file to HDFS, it can=C2=B4t 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 s=
hould 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 fil=
e
> of 0 length.
>
> Regards,
>     Mohammad Tariq
>
>
>
> On Fri, Nov 9, 2012 at 3:18 AM, Kartashov, Andy <Andy.Kartashov@mpac.ca>w=
rote:
>
>> 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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