Thank You very much if it is the case then ApplicationMaster alone takes alomst
everything that my datanode can offer - that would explain why task itself
can't start. Thank You very much again.
Dnia 17 listopada 2015 20:40 Bikas Saha <[email protected]> napisał(a):
You can check for “yarn.app.mapreduce.am.resource.mb” in your configs. Its
default is 1.5GB and other MR task defaults are 1GB. From: darekg11
[mailto:[email protected]]
Sent: Tuesday, November 17, 2015 11:34 AM
To: [email protected]
Subject: RE: Does MapReduceApplicationMaster prevents data node from spawning
YarnChild? Thank You very much, will check but the problem is that machines
aren't really powerful - only 2GB of RAM and 2xCore each at 3.3GHz.
Do You maybe know approx value of required resources for AppMaster? And can we
check current resource consumption of AppMaster?
Dnia 17 listopada 2015 18:40 Bikas Saha <[email protected]> napisał(a):No.
In general App Masters and their containers can be launched on any machine and
both can be launched on the same machine. If your case happens repeatedly then
you could check the RM UI, while the job is running, to see the maximum
resource on a node manager and the resource currently assigned. Perhaps your
node managers don’t have enough resources to run multiple containers? From:
darekg11 [mailto:[email protected]]
Sent: Tuesday, November 17, 2015 7:55 AM
To: [email protected]
Subject: Does MapReduceApplicationMaster prevents data node from spawning
YarnChild? Hello again dear users.
Today I ran into following problem:
My mini cluster consist of:
1 NameNode and 2 SlaveNodes.
When I ran my MapReduce program written in java with number of reducers equals
to two.
As the result on first SlaveNode I got MRAppMaster task and only the second
slave launched Yarn Child which actually was producing output results.
I understand that MRAppMaster is essential process repsonsible for managing
life of given task.
And because of that single slave node can't launch MrAppMaster and Yarn Child
at the same time or am I misunderstanding something?
