hadoop-mapreduce-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Krishna Kishore Bonagiri <write2kish...@gmail.com>
Subject Re: Extra start-up overhead with hadoop-2.1.0-beta
Date Thu, 01 Aug 2013 09:19:07 GMT
Hi,
  Please share with me if you anyone has an answer or clues to my question
regarding the start up performance.

Also, one more thing I have observed today is the time taken to run a
command on a container went up by more than a second in this latest version.

When using 2.0.4-alpha, it used to take 0.3 to 0.5 seconds from the point I
call startContainer() to the  point the command is started on the container.

where as

When using 2.1.0-beta, it is taking around 1.5 seconds from the point it
came to the call back onContainerStarted() to the point the command is seen
started running on the container.

Thanks,
Kishore


On Thu, Jul 25, 2013 at 8:38 PM, Krishna Kishore Bonagiri <
write2kishore@gmail.com> wrote:

> Hi,
>
>   I have been using the hadoop-2.0.1-beta release candidate and observed
> that it is slower in running my simple application that runs on 2
> containers. I have tried to find out which parts of it is really having
> this extra overhead(compared to hadoop-2.0.4-alpha), and here is what I
> found that.
>
> 1) From the point my Client has submitted the Application Master to RM, it
> is taking 2  seconds extra
> 2) From the point my container request are set up by Application Master,
> till the containers are allocated, it is taking 2 seconds extra
>
> Is this overhead expected with the changes that went into the new version?
> Or is there to improve it by changing something in configurations or so?
>
> Thanks,
> Kishore
>

Mime
View raw message