Thanks Arun for your tip.
This morning I changed to submitJob and polled. It worked very well,
and you saved me some trial and error.
-----Original Message-----
From: Aaron Kimball [mailto:[EMAIL PROTECTED]
Sent: Monday, November 10, 2008 4:35 AM
To: core-user@hadoop.apache.org
Subject: Re: Dynamically terminate a job once Reporter hits a threshold
Out of curiosity, how reliable are the counters from the perspective of
the
JobClient while the job is in progress? While hitting 'refresh' on the
status web page for a job, I notice that my counters bounce all over the
place, showing wildly different figures second-to-second. Is that using
a
different (less well-synchronized?) mechanism to access the counters
than
the user has available in the JobClient? (If so, is this something we
can
easily patch to make more consistent?)
- Aaron
On Fri, Nov 7, 2008 at 12:21 PM, Arun C Murthy <[EMAIL PROTECTED]>
wrote:
>
> On Nov 7, 2008, at 12:12 PM, Brian MacKay wrote:
>
>
>> Looking for a way to dynamically terminate a job once Reporter in a
Map
>> job hits a threshold,
>>
>> Example:
>>
>> public void map(WritableComparable key, Text values, Output
>> Collector<Text, Text> output, Reporter reporter) throws IOException {
>>
>> if( reporter.getCount() > SomeConfigValue) {
>> return;
>> }
>> .... map job code
>> }
>>
>> Obviously, reporter.getCount() doesn't exist. Open to other ideas,
and
>> any advice would be appreciated.
>>
>
> If you _really_ need this, you could do this from your JobClient...
use
> JobClient.submitJob (rather than runJob:
>
http://hadoop.apache.org/core/docs/current/mapred_tutorial.html#Job+Subm
ission+and+Monitoring),
> manually fetch the Counters you need and terminate the Job via
> JobClient.getJob(jobId).killJob().
>
> Arun
>
>
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