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Subject: Question about Yarn
To: user@hadoop.apache.org
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hi all

  I have some question about yarn when I read the tutorial on the website.

 1) the contain is physical or logic? for example, there are three
PCs(A,B,C) on Cluster.  if I allocate one container. it will run on one PC
all the time. or the container will work on different PC at different time.

2) the contain, I can think it's a virtual PC which can run java
application? is my correct?

3)about mapreduce, how mapreduce run on yarn? after reading the tutorial, I
think yarn and mapreduce is totally different thing. I think the basic unit
of yarn is container. map and reduce's basic unit is map and reduce.

or how yarn handle concurrent? I know in mapreduce, I don't need to think
too much about concurrent. because mapreduce will do this for you. it will
split data into a small unit and you can do what you do. but I don't find
yarn has same thing.

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<div dir=3D"ltr"><div><div><div><div><div><div>hi all<br><br></div>=A0 I ha=
ve some question about yarn when I read the tutorial on the website.<br>=A0=
<br></div>=A01) the contain is physical or logic? for example, there are th=
ree PCs(A,B,C) on Cluster.=A0 if I allocate one container. it will run on o=
ne PC all the time. or the container will work on different PC at different=
 time.<br>

<br></div>2) the contain, I can think it&#39;s a virtual PC which can run j=
ava application? is my correct?<br><br></div>3)about mapreduce, how mapredu=
ce run on yarn? after reading the tutorial, I think yarn and mapreduce is t=
otally different thing. I think the basic unit of yarn is container. map an=
d reduce&#39;s basic unit is map and reduce.<br>

<br></div>or how yarn handle concurrent? I know in mapreduce, I don&#39;t n=
eed to think too much about concurrent. because mapreduce will do this for =
you. it will split data into a small unit and you can do what you do. but I=
 don&#39;t find yarn has same thing.<br>

</div><br></div>

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