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MapReduce >> mail # user >> How to find Blacklisted Nodes via cli.

Dhanasekaran Anbalagan 2013-01-30, 16:05
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Re: How to find Blacklisted Nodes via cli.
*bin/hadoop dfsadmin -report should give you what you are looking for.*
*a node is blacklisted only if there are too many failures on a particular
node. You can clear it by restarting the particular datanode or tasktracker
service. This is for the better performance of your hadoop cluster to
remove a node where too many failures are happening so that you can figure
out the reason and then add it back in cluster. you can also exclude the
node from the cluster all together. *
*I never tried myself removing a node from blacklist on the fly so not sure
how that is done. I will wait if someone can tell me witout restart its
possible or not (without increasing the failure thresholds ) *
On Wed, Jan 30, 2013 at 9:35 PM, Dhanasekaran Anbalagan

> Hi Guys,
> How to find Blacklisted Nodes via, command line. I want to see job
> Tracker Blacklisted Nodes and hdfs Blacklisted Nodes.
> and also how to clear blacklisted nodes to clear start. The only option to
> restart the service. some other way clear the Blacklisted Nodes.
> please guide me.
> -Dhanasekaran.
> Did I learn something today? If not, I wasted it.

Nitin Pawar
Hemanth Yamijala 2013-01-31, 04:25