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Posted to common-dev@hadoop.apache.org by Bharath Ravi <bh...@gmail.com> on 2011/10/26 01:08:57 UTC

DataTransferProtocol Implementations

Hi all,

I'm trying some experiments where I need to perform actions whenever a data
block is read/written to by a client
There seem to be two classes that implement readBlock() and writeBlock():
DataXceiver.java and Sender.java.

Looking at the documentation, I note that DataXceiverServer and DataXceiver
are used to respond to clients.
In what cases is the "Sender" class used? (It is also used by DataXceiver
itself, in a few cases)

Thanks a lot for the help!
-- 
Bharath Ravi

Re: DataTransferProtocol Implementations

Posted by Bharath Ravi <bh...@gmail.com>.

Thanks a lot for clarifying, Tsz-Wo!

On 25 October 2011 19:15, Tsz Wo Sze <sz...@yahoo.com> wrote:

> Hi Bharath,
>
> Sender, which is to send request, is used by DFSClient for submitting to
> datanodes and by datanodes in write pipelines.  Correspondingly, Receiveris
> to receive request.  DataXceiver, which extends Receiver, is the class for
> receiving requesting in Datanode.
>
> Tsz-Wo
>
>
>
> ________________________________
> From: Bharath Ravi <bh...@gmail.com>
> To: common-dev@hadoop.apache.org
> Sent: Tuesday, October 25, 2011 4:08 PM
> Subject: DataTransferProtocol Implementations
>
> Hi all,
>
> I'm trying some experiments where I need to perform actions whenever a data
> block is read/written to by a client
> There seem to be two classes that implement readBlock() and writeBlock():
> DataXceiver.java and Sender.java.
>
> Looking at the documentation, I note that DataXceiverServer and DataXceiver
> are used to respond to clients.
> In what cases is the "Sender" class used? (It is also used by DataXceiver
> itself, in a few cases)
>
> Thanks a lot for the help!
> --
> Bharath Ravi
>



-- 
Bharath Ravi

Re: DataTransferProtocol Implementations

Posted by Tsz Wo Sze <sz...@yahoo.com>.

Hi Bharath,

Sender, which is to send request, is used by DFSClient for submitting to datanodes and by datanodes in write pipelines.  Correspondingly, Receiveris to receive request.  DataXceiver, which extends Receiver, is the class for receiving requesting in Datanode.

Tsz-Wo



________________________________
From: Bharath Ravi <bh...@gmail.com>
To: common-dev@hadoop.apache.org
Sent: Tuesday, October 25, 2011 4:08 PM
Subject: DataTransferProtocol Implementations

Hi all,

I'm trying some experiments where I need to perform actions whenever a data
block is read/written to by a client
There seem to be two classes that implement readBlock() and writeBlock():
DataXceiver.java and Sender.java.

Looking at the documentation, I note that DataXceiverServer and DataXceiver
are used to respond to clients.
In what cases is the "Sender" class used? (It is also used by DataXceiver
itself, in a few cases)

Thanks a lot for the help!
-- 
Bharath Ravi