2 datanodes is slower ,how to get those details .what is your approach as hadoop admin

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2 datanodes is slower ,how to get those details .what is your approach as hadoop admin ?
Sep 21 in Big Data Hadoop by raghavendra
• 140 points
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1 answer to this question.

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First, enable the detection of slow nodes. You can do this by setting the value of dfs.namenode.peer.stats.enabled property to true. 

<property>
 <name>dfs.datanode.peer.stats.enabled</name>
 <value>true</value> 
</property>

Let the cluster run for sometime. 

To access the details, visit: http://<namenode_host>:50070/jmx

Here you will see the time taken by datanodes. After you have detected the datanodes that are slow, you have to check for the bottlenecks in data flow. 

answered Sep 23 by Riya

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