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HDFS, mail # user - Hadoop filesystem directories not visible


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Re: Hadoop filesystem directories not visible
Mohammad Tariq 2012-07-19, 10:01
Saniya n Yuvrajsinh,

     You can't find the actual directory structure. Though you can go
inside "current" directory and see the file blocks. And as far as
writing files to Hdfs is concerned you have to use the Hdfs API.
Regards,
    Mohammad Tariq
On Thu, Jul 19, 2012 at 3:22 PM, Bejoy KS <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]>
> Date: Thu, 19 Jul 2012 15:16:24 +0530
> To: <[EMAIL PROTECTED]>
> ReplyTo: [EMAIL PROTECTED]
> 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:[EMAIL PROTECTED]]
> Sent: 19 July 2012 14:58
> To: [EMAIL PROTECTED]
> 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]>
> 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
>
>