I was having same issue and was getting same error but when I was running any command through directory where I have installed CDH, I was able to run all the commands - hadoop, hdfs, spark-shell ect.   e.g. if your CHD installation location is - /dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   you can test -   $ cd /dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   [root@xyz bin]# ./hadoop and if it work then you need to set up environment variable in your Unix master server   For RHEL -   [root@xyz~]# echo "$PATH" /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin   [root@xyz~]# export PATH=$PATH:/path/to/CHD_Installation_bin_path   for me it's - /dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   [root@xyz~]# echo "$PATH"   /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin   to make permanent change -   $ echo "export PATH=$PATH:/dat/anlt1/cld/cloudera/CDH-5.8.3-1.cdh5.8.3.p0.2/bin" >> /etc/profile   after that restart(reboot) your server. ... View more

Hi Gautam My issue is I think with filled space , after troubleshooting i found i was earlier using /dfs/dn for HDFS block storage , later i added non OS partition under /home (/home/hdfs/dfs/dn) and then started importing  100 of GB data.  Looks like some how my old path /dfs/dn had also sotred some of HDFS blocks and filled that root partition. Sais so if now by chnagging the configuration  remove (/dfs/dn)  dfs.data.dir  and restart cluster will it do automatic move data to only left location /home/hdfs/dfs/dn or how to handle that. I guess this will fix my problem for now.   Do not worry about data much what ever best and quick will be fine .     [root@hadoop-vm2 /]# du -sh ./* 7.9M ./bin 61M ./boot 4.0K ./cgroup 196K ./dev 40G ./dfs 30M ./etc 55G ./home 12K ./impala 263M ./lib 27M ./lib64 16K ./lost+found 4.0K ./media 0 ./misc 4.0K ./mnt 0 ./net 3.5G ./opt du: cannot access `./proc/20676/task/20676/fd/4': No such file or directory du: cannot access `./proc/20676/task/20676/fdinfo/4': No such file or directory du: cannot access `./proc/20676/fd/4': No such file or directory du: cannot access `./proc/20676/fdinfo/4': No such file or directory 0 ./proc 92K ./root 15M ./sbin 4.0K ./selinux 4.0K ./srv 0 ./sys 1.2M ./tmp 2.9G ./usr 387M ./var 223M ./yarn [root@hadoop-vm2 /]# ls /dfs/dn/current/ BP-1505211549-172.28.172.30-1424252944658 VERSION ... View more