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Subject: Re: TaskID
References: <A622FB24-6A60-4FB3-94F3-90CB20CE42FD@mparallelo.com>
 <CABCYYb_LJ1hJV1V-RGDf=6c5d4n84ADiweV-=8BiX2rWuB4UoQ@mail.gmail.com>
From: Bharati <bharati.adkar@mparallelo.com>
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Message-Id: <5863B400-B28A-4FE9-A82B-A6AF82D63AF6@mparallelo.com>
Date: Thu, 25 Apr 2013 10:08:30 -0700
To: "user@hadoop.apache.org" <user@hadoop.apache.org>
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Thanks,
I will try it and let you know if I run into problems.=20

Sent from my iPhone

On Apr 25, 2013, at 9:20 AM, Chris Nauroth <cnauroth@hortonworks.com> wrote:=


> Hi Bharati,
>=20
> Your mapper class implementation methods have access to a MapContext:
>=20
> http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/MapC=
ontext.html
>=20
> This is a subclass of TaskAttemptContext:
>=20
> http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/Task=
AttemptContext.html
>=20
> You can use the TaskAttemptContext to call getTaskAttemptId and retrieve a=
 TaskAttemptID object:
>=20
> http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/Task=
AttemptID.html
>=20
> A task attempt ID consists of the task ID + an attempt number.  Note that t=
ask ID alone is not guaranteed to be unique across execution of the whole jo=
b.  Due to speculative execution or transient task failures, multiple attemp=
ts of the same task can run, and they'll all have the same task ID.  The tas=
k ID + attempt number is guaranteed to be unique within the job.
>=20
> BTW, it's pretty much the same process for a reducer too, except you're wo=
rking with a ReduceContext instead of a MapContext.
>=20
> Hope this helps,
> --Chris
>=20
>=20
>=20
>=20
>=20
>=20
>=20
> On Thu, Apr 25, 2013 at 8:45 AM, Bharati <bharati.adkar@mparallelo.com> wr=
ote:
>> Hi Folks,
>>=20
>> I need to find the task ID of the map task.
>> Please send me any ideas or suggestions.
>>=20
>> Thanks,
>> Bharati
>>=20
>> Sent from my iPad
>>=20
>> Fortigate Filtered
>=20

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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks,</div><div>I will try it and let you know if I run into problems.&nbsp;<br><br>Sent from my iPhone</div><div><br>On Apr 25, 2013, at 9:20 AM, Chris Nauroth &lt;<a href="mailto:cnauroth@hortonworks.com">cnauroth@hortonworks.com</a>&gt; wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Hi Bharati,<div><br></div><div style="">Your mapper class implementation methods have access to a MapContext:</div><div style=""><br></div><div style=""><a href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/MapContext.html">http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/MapContext.html</a><br>
</div><div style=""><br></div><div style="">This is a subclass of TaskAttemptContext:</div><div style=""><br></div><div style=""><a href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/TaskAttemptContext.html">http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/TaskAttemptContext.html</a><br>
</div><div style=""><br></div><div style="">You can use the TaskAttemptContext to call getTaskAttemptId and retrieve a TaskAttemptID object:</div><div style=""><br></div><div style=""><a href="http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/TaskAttemptID.html">http://hadoop.apache.org/docs/current/api/org/apache/hadoop/mapreduce/TaskAttemptID.html</a><br>
</div><div style=""><br></div><div style="">A task attempt ID consists of the task ID + an attempt number. &nbsp;Note that task ID alone is not guaranteed to be unique across execution of the whole job. &nbsp;Due to speculative execution or transient task failures, multiple attempts of the same task can run, and they'll all have the same task ID. &nbsp;The task ID + attempt number is guaranteed to be unique within the job.</div>
<div style=""><br></div><div style="">BTW, it's pretty much the same process for a reducer too, except you're working with a ReduceContext instead of a MapContext.</div><div style=""><br></div><div style="">Hope this helps,</div>
<div style="">--Chris</div><div style=""><br></div><div style=""><br></div><div style=""><br></div><div style=""><br></div><div style=""><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Apr 25, 2013 at 8:45 AM, Bharati <span dir="ltr">&lt;<a href="mailto:bharati.adkar@mparallelo.com" target="_blank">bharati.adkar@mparallelo.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Folks,<br>
<br>
I need to find the task ID of the map task.<br>
Please send me any ideas or suggestions.<br>
<br>
Thanks,<br>
Bharati<br>
<br>
Sent from my iPad<br>
<br>Fortigate Filtered<br>
<br></blockquote></div><br></div>
</div></blockquote></body></html>
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Fortigate Filtered

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