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MapReduce, mail # user - RE: Task status query


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RE: Task status query
John Lilley 2013-10-01, 20:46
Thanks Arun!  It is sometimes hard for me to figure out what is built into YARN vs what is done by convention.
John
From: Arun C Murthy [mailto:[EMAIL PROTECTED]]
Sent: Monday, September 23, 2013 5:41 PM
To: [EMAIL PROTECTED]
Subject: Re: Task status query

Yep, typically, the AM should pass it's host:port to the task as part of either the cmd-line for the task or in it's env. That is what is done by MR AM.

hth,
Arun

On Sep 21, 2013, at 6:52 AM, John Lilley <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
Thanks Harsh!  The data-transport format is pretty easy, but how is the RPC typically set up?  Does the AM open a listen port to accept the RPC from the tasks, and then pass the port/URI to the tasks when they are spawned as command-line or environment?
john

-----Original Message-----
From: Harsh J [mailto:[EMAIL PROTECTED]<http://cloudera.com>]
Sent: Friday, September 20, 2013 7:47 AM
To: <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
Subject: Re: Task status query

Right now its MR specific (TaskUmbilicalProtocol) - YARN doesn't have any reusable items here yet, but there are easy to use RPC libs such as Avro and Thrift out there that make it easy to do such things once you define what you want in a schema/spec form.

On Fri, Sep 20, 2013 at 5:32 PM, John Lilley <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:

Thanks Harsh.  Is this protocol something that is available to all AMs/tasks?  Or is it up to each AM/task pair to develop their own protocol?
john

-----Original Message-----
From: Harsh J [mailto:[EMAIL PROTECTED]<http://cloudera.com>]
Sent: Thursday, September 19, 2013 9:20 PM
To: <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
Subject: Re: Task status query

Hi John,

YARN tasks can be more than simple executables. In case of MR, for example, tasks talk to the AM and report their individual progress and counters back to it, via a specific protocol (over the network), giving the AM more data to compute an near-accurate global progress.

On Fri, Sep 20, 2013 at 12:18 AM, John Lilley <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:

How does a YARN application master typically query ongoing status
(like percentage completion) of its tasks?

I would like to be able to ultimately relay information to the user like:

100 tasks are scheduled

10 tasks are complete

4 tasks are running and they are (4%, 10%, 50%, 70%) complete

But, given that YARN tasks are simply executables, how can the AM
even get at this information?  Can the AM get access to stdout/stderr?

Thanks

John
--
Harsh J

--
Harsh J

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Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/
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