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From: Harsh J <harsh@cloudera.com>
Date: Wed, 27 Mar 2013 15:57:46 +0530
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 <CAOcnVr1KezmdKdMdnpYe8Q4+q0E8MBHhocT-50dn8XUSFU_1pw@mail.gmail.com>
Subject: Re: System.out.printlin vs Counters
To: "<user@hadoop.apache.org>" <user@hadoop.apache.org>,
 Sai Sai <saigraph@yahoo.in>
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I do not understand 1 and 2: Counters are used to count things in the MR
framework in a distributed manner and get aggregate at the JobTracker
level; System.out is merely used to write to STDOUT. Why are you
comparing the two?

3: The limit means the total number of counter names accepted from a
single job. Your example would create one such new counter called
TestGroup1.TestName1. You could also increment TestName2, etc.=85 but
only up to a global max of 120 of such new counters.

On Wed, Mar 27, 2013 at 3:51 PM, Sai Sai <saigraph@yahoo.in> wrote:
> Q1. Is it right to assume the System.out.println statements are used only=
 in
> eclipse environment and
> In a multi node cluster environment we need to use counters.
>
> Q2. I am slightly confused as it appears like using System.out.println
> statements
> we r able to get detailed info at every line of code in eclipse and count=
ers
> just give few lines and not as detailed as System.out.println statements =
do
> so what should we do in a multi node cluster enivronment.
>
> Q3. Also when they say the limit of counters is 120 does that mean that i=
n
> the output if we use:
> context.getCounters("TestGroup1","TestName1").increment(1);
> more than 120 times it will not print it. or does it refer to 120 options=
 of
> counters in an enum that we can define.
>
> Any help is really appreciated.
> Thanks
> Sai
>
>


--
Harsh J