localhost: ERROR: Cannot set priority of datanode process 32156

Question

I am trying to install hadoop on ubuntu 16.04 but while starting the hadoop it will give me following error

localhost: ERROR: Cannot set priority of datanod         


        

Answer 1

I have run into the same error when installing Hadoop 3.0.0-RC0. My situation was all services starting successfully except Datanode.

I found that some configs in hadoop-env.sh weren't correct in version 3.0.0-RC0, but were correct in version 2.x.

I ended up replacing my hadoop-env.sh with the official one and set JAVA_HOME and HADOOP_HOME. Now, Datanodes is working fine.