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Message-ID: <i2o61fec3fc1004270427ybfa0f343o851038b21e2ada3@mail.gmail.com>
Subject: How to debug reducer thread?
From: psdc1978 <psdc1978@gmail.com>
To: mapreduce-user@hadoop.apache.org
Content-Type: multipart/alternative; boundary=001636498b15d9c9160485362d0f

--001636498b15d9c9160485362d0f
Content-Type: text/plain; charset=ISO-8859-1

Hi,

The reduce tasks are threads that are launched by the Reducer. The print
below shows the stacktrace of one reduce task.

at
org.apache.hadoop.mapred.ReduceTask$ReduceCopier.fetchHashesOutputs(ReduceTask.java:2582)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:395)
at org.apache.hadoop.mapred.Child.main(Child.java:194)

I would like to debug this thread in a IDE but I don't know how to do it.
Should I define properties to do this? Is there a way to do it?

Thanks

-- 
PSC

--001636498b15d9c9160485362d0f
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Hi,<br><br>The reduce tasks are threads that are launched by the Reducer. T=
he print below shows the stacktrace of one reduce task. <br><br>at org.apac=
he.hadoop.mapred.ReduceTask$ReduceCopier.fetchHashesOutputs(ReduceTask.java=
:2582)<br>
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:395)<br>at org.a=
pache.hadoop.mapred.Child.main(Child.java:194)<br><br>I would like to debug=
 this thread in a IDE but I don&#39;t know how to do it. Should I define pr=
operties to do this? Is there a way to do it?<br>
<br>Thanks<br><br>-- <br>PSC<br>

--001636498b15d9c9160485362d0f--