Hi all,
I am interested in exploring how the blockID is generated in hadoop world
by the namenode. Any pointers to the class/method which takes care of this
generation?
Thanks in advance,
~Kartheek.

Kartheek,

(- hdfs-user (bcc'd))

Its simple enough to trace back a FileSystem -> DFSClient -> NameNode call in code, for the operation of creating a file (and thereafter a block).

What you are looking for, specifically, is in FSNamesystem#allocateBlock(…).

On 29-Nov-2011, at 6:07 PM, kartheek muthyala wrote:

> Hi all,
> I am interested in exploring how the blockID is generated in hadoop world by the namenode. Any pointers to the class/method which takes care of this generation?
> Thanks in advance,
> ~Kartheek.

you can find the code directly in FSNameSystem#allocateBlock
It is just a random long number and will ensure that blockid is not created already by NN.
Regards,
Uma
________________________________________
From: kartheek muthyala [[EMAIL PROTECTED]]
Sent: Tuesday, November 29, 2011 6:07 PM
To: [EMAIL PROTECTED]; hdfs-user
Subject: blockID generation

Hi all,
I am interested in exploring how the blockID is generated in hadoop world
by the namenode. Any pointers to the class/method which takes care of this
generation?
Thanks in advance,
~Kartheek.

Thanks you all for the reply.
~Kartheek

On Tue, Nov 29, 2011 at 6:30 PM, Uma Maheswara Rao G
<[EMAIL PROTECTED]>wrote:

> you can find the code directly in FSNameSystem#allocateBlock
> It is just a random long number and will ensure that blockid is not
> created already by NN.
> Regards,
> Uma
> ________________________________________
> From: kartheek muthyala [[EMAIL PROTECTED]]
> Sent: Tuesday, November 29, 2011 6:07 PM
> To: [EMAIL PROTECTED]; hdfs-user
> Subject: blockID generation
>
> Hi all,
> I am interested in exploring how the blockID is generated in hadoop world
> by the namenode. Any pointers to the class/method which takes care of this
> generation?
> Thanks in advance,
> ~Kartheek.
>