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From Sanjay Subramanian <>
Subject Re: how does hive find where is MR job tracker
Date Tue, 28 May 2013 17:08:07 GMT
In Cloudera Manager , there is a Safety Valve feature (its a multiline text widget) that u
can use to input the XML properties that u would use for mapred-site.xml

Possibly since u changed the JobTracker machine , u have to mod the mapred-site.xml  to specify
the machine name and port



From: "<>" <<>>
Reply-To: "<>" <<>>,
"<>" <<>>
Date: Tuesday, May 28, 2013 10:02 AM
To: "<>" <<>>
Subject: Re: how does hive find where is MR job tracker

Hive gets the JobTracker from the mapred-site.xml specified within your $HADOOP_HOME/conf.

Is your $HADOOP_HOME/conf/mapred-site.xml on the node that runs hive have the correct value
for jobtracker?
If not changing that to the right one might resolve your issue.
Bejoy KS

Sent from remote device, Please excuse typos
From: Frank Luo <<>>
Date: Tue, 28 May 2013 16:49:01 +0000
Subject: how does hive find where is MR job tracker

I have a cloudera cluster, version 4.2.0.

In the hive configuration, I have “MapReduce Service” set to “mapreduce1”, which is
my MR service.

However, without setting “mapred.job.tracker”, whenever I run hive command, it always
sends the job to a wrong job tracker. Here is the error: Call From hqhd01ed01.pclc0.merkle.local/ to hqhd01ed01.pclc0.merkle.local:8021
failed on connection exception: Connection refused; For more details

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(

And the Cloudera Manager doesn’t allow me to manually set “mapred.job.tracker”. So my
question is how to make Hive point to the right job tracker without setting ““mapred.job.tracker”
every time.

PS. Not sure it matters, but I did move the job tracker from machine A to machine B.


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