hadoop-hdfs-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Yuvrajsinh Chauhan" <yuvraj.chau...@elitecore.com>
Subject RE: Hadoop filesystem directories not visible
Date Thu, 19 Jul 2012 10:01:42 GMT
So, I understand that, If I want to write a file then I need to change the
code of my external application need to integrate Hadoop read-write
command/API.

 

Regards,

Yuvrajsinh Chauhan 

 

From: Saniya Khalsa [mailto:saniya.khalsa@gmail.com] 
Sent: 19 July 2012 15:27
To: hdfs-user@hadoop.apache.org; bejoy.hadoop@gmail.com
Subject: Re: Hadoop filesystem directories not visible

 

Thanks Bejoy!!




On Thu, Jul 19, 2012 at 3:22 PM, Bejoy KS <bejoy.hadoop@gmail.com> wrote:

Hi Saniya

In hdfs the directory exists only as meta data in the name node. There is no
real hierarchical existence like normal file system. It is the data in the
files that is stored as hdfs blocks distributed across data nodes. You see
these hdfs blocks arranged in dfs.data.dir .

Regards
Bejoy KS

Sent from handheld, please excuse typos.

  _____  

From: "Yuvrajsinh Chauhan" <yuvraj.chauhan@elitecore.com> 

Date: Thu, 19 Jul 2012 15:16:24 +0530

To: <hdfs-user@hadoop.apache.org>

ReplyTo: hdfs-user@hadoop.apache.org 

Subject: RE: Hadoop filesystem directories not visible

 

Dear Saniya,

 

I Second to you on this. Am also find exactly the same folder on secondary
data node.

Also, How can I write files from my external application ?

 

Regards,

 

Yuvrajsinh Chauhan || Sr. DBA || CRESTEL-PSG

Elitecore Technologies Pvt. Ltd.

904, Silicon Tower || Off C.G.Road

Behind Pariseema Building || Ahmedabad || INDIA

[GSM]: +91 9727746022

 

From: Saniya Khalsa [mailto:saniya.khalsa@gmail.com] 
Sent: 19 July 2012 14:58
To: hdfs-user@hadoop.apache.org
Subject: Re: Hadoop filesystem directories not visible

 

Hi Mohammad Tariq,



Thanks for the reply!!

The path to dfs.data.dir is /app/hadoop/tmp/dfs/data

when i go there i find only these :

BlocksBeingWriiten
Current
Detach
In_use.lock
storage
tmp

I am unable to see the created directories here.

Regards
Saniya



On Thu, Jul 19, 2012 at 2:39 PM, Mohammad Tariq <dontariq@gmail.com> wrote:

Hello Saniya,

        If you are talking about the local FS, then it will be present
at the location specified as the value of 'dfs.data.dir' property in
hdfs-site.xml file.

Regards,
    Mohammad Tariq



On Thu, Jul 19, 2012 at 1:09 PM, Saniya Khalsa <saniya.khalsa@gmail.com>
wrote:
> Hi,
>
> I ran these commands
>
> $HADOOP_HOME/bin/hadoop fs -mkdir /tmp
> $HADOOP_HOME/bin/hadoop fs -mkdir /user
> The directories got created and I can now see the directories using
> following commands:
>
> [hadoop@master bin]$ ./hadoop fs -ls /
> Found 5 items
> drwxr-xr-x   - hadoop supergroup          0 2012-07-16 14:11 /app
> drwxr-xr-x   - hadoop supergroup          0 2012-07-17 17:41 /hadoop
> drwxr-xr-x   - hadoop supergroup          0 2012-07-18 14:11 /hbase
> drwxr-xr-x   - hadoop supergroup          0 2012-07-19 14:11 /tmp
> drwxr-xr-x   - hadoop supergroup          0 2012-07-19 17:41 /user
>
>
> I can see this data from both the nodes by typing the command ,but i
cannot
> view  the directories created in the file path anywhere.Please tell me how
> to see these directories created in file system.
>
> Thanks

 

 


Mime
View raw message