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Hadoop: jobtracker.jsp doesnot work?

+1 vote

I use Hadoop 2.2 and I want to run MapReduce web UI. So I visit following url: http://x.x.x.x:50030/jobtracker.jsp

Unable to connect Firefox can't establish a connection to the server at x.x.x.x:50030. Where am I wrong?

posted Mar 3, 2014 by Sanketi Garg

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1 Answer

+1 vote

In Hadoop 2.2, theres no actual jobtracker running, you may want to access the Resource Manager Web UI: http://x.x.x.x:8088/

answer Mar 3, 2014 by Kumar Mitrasen
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+2 votes

we want to set the heartbeat timout for a tasktracker.

If the tasktracker does not send heartbeats for 60 seconds he should be marked as lost. I found the parameter mapreduce.jobtracker.expire.trackers.interval which sounds right to me.

I defined

mapreduce.jobtracker.expire.trackers.interval 60000

in the mapred-site.xml on all servers and restarted the jobtracker and all tasktrackers.

I started a benchmark "hadoop jar hadoop-examples.jar randomwriter rand" and every tasktracker gets 2 jobs. It is a small test environment.

On one tasktracker i stopped the network. On the jobtracker i could see the "Seconds since heartbeat"
increasing. But after 60 seconds the tasktracker was still in the overview. Even in the log of the jobtracker I found nothing.

After over 600 seconds i found the message

org.apache.hadoop.mapred.JobTracker: Lost tracker .....

And the tasktracker wasn't shown any more on the jobtracker. Isn't this the right setting?

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