yarn: execute a script on all the nodes in the cluster


This is more Linux script related, but, sometimes we have a Hadoop (YARN) cluster running and we need to run a post install script or activity that executes on all the nodes in the cluster:

for i in `yarn node --list | cut -f 1 -d ':' | grep "ip"`; do ssh -i your-key.pem hadoop@$i 'hadoop fs -copyToLocal s3://mybucket/myscript.sh | chmod +x /home/hadoop/myscript.sh | /home/hadoop/myscript.sh' ; done

Note: we will need the your-key.pem file in the master node.

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