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From yves callaert <yves_calla...@hotmail.com>
Subject RE: Monitoring dashboard for Hadoop?
Date Thu, 04 Jun 2015 06:20:00 GMT
Depending on the version you are using there are some ways to monitor jobs.
You can use Hue (cloudera technology) which has a job monitoring system, but you could also
use the "Yarn Resource Manager UI" to follow jobs.

Monitoring of nodes can be done through ambari(https://ambari.apache.org/) or Cloudera Manager
(only available for cloudera distributions).

As far as I know the replication process for HDFS can not be changed to favour nodes.
An even distribution is needed in order to have an evenly spreaded load.
If replication blocks get corrupted this will be visible in the logs but the namenode will
auto correct the problem by creating a new version of the block.
Normally you will have a replication factor of 3, but you can change this, if you want data
to be spread across more nodes.

Hope this answers some questions.

With Regards,
From: caesarsamsi@mac.com
To: user@hadoop.apache.org
Subject: Monitoring dashboard for Hadoop?
Date: Wed, 3 Jun 2015 17:25:43 -0400

Hello, I’m new to Hadoop and successfully built a fully distributed cluster of 3 nodes (1
master, 2 slaves) as a proof of concept. I have some questions below. Is there a dashboard
to monitor the progress of a mapreduce computation? 1.       I’m looking to ensure the computation
gets allocated and uses the correct number of computation nodes2.       Monitor computation
on the nodes (up/down/in-progress/completed)3.       If possible direct computation to specific
group of nodes (depending on the computation priority). Similarly for HDFS1.       Ensure
data file gets replicated to the correct number of nodes2.       If possible prioritize data
replication (i.e. replicate data files that are accessed frequently to nodes that have better
hardware, so some sort of load balancing distribution) Many Thanks, Caesar. 		 	   		  
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