Failed to format namenode error during while installing cdh 6.2

[#1]

The hdfs installation fails with the following error while installing cdh 6.2.

Can't open /var/run/cloudera-scm-agent/process/63-hdfs-NAMENODE-format/supervisor_status:Permission denied

what would cause this error?

[#2]

Can't open /var/run/cloudera-scm-agent/process/67-hdfs-NAMENODE-format/supervisor_status: Permission denied.
+ make_scripts_executable
+ find /var/run/cloudera-scm-agent/process/67-hdfs-NAMENODE-format -regex '.*\.\(py\|sh\)$' -exec chmod u+x '{}' ';'
+ '[' DATANODE_MAX_LOCKED_MEMORY '!=' '' ']'
+ ulimit -l
+ export HADOOP_IDENT_STRING=hdfs
+ HADOOP_IDENT_STRING=hdfs
+ '[' -n '' ']'
+ '[' mkdir '!=' format-namenode ']'
+ acquire_kerberos_tgt hdfs.keytab
+ '[' -z hdfs.keytab ']'
+ KERBEROS_PRINCIPAL=
+ '[' '!' -z '' ']'
+ '[' -n '' ']'
+ '[' validate-writable-empty-dirs = format-namenode ']'
+ '[' file-operation = format-namenode ']'
+ '[' bootstrap = format-namenode ']'
+ '[' failover = format-namenode ']'
+ '[' transition-to-active = format-namenode ']'
+ '[' initializeSharedEdits = format-namenode ']'
+ '[' initialize-znode = format-namenode ']'
+ '[' format-namenode = format-namenode ']'
+ '[' -z /dfs/nn ']'
+ for dfsdir in '$DFS_STORAGE_DIRS'
+ '[' -e /dfs/nn ']'
+ '[' '!' -d /dfs/nn ']'
+ CLUSTER_ARGS=
+ '[' 2 -eq 2 ']'
+ CLUSTER_ARGS='-clusterId cluster19'
+ '[' 3 = 6 ']'
+ '[' -3 = 6 ']'
+ exec /opt/cloudera/parcels/CDH-6.2.0-1.cdh6.2.0.p0.967373/lib/hadoop-hdfs/bin/hdfs --config /var/run/cloudera-scm-agent/process/67-hdfs-NAMENODE-format namenode -format -clusterId cluster19 -nonInteractive
WARNING: HADOOP_PREFIX has been replaced by HADOOP_HOME. Using value of HADOOP_PREFIX.
WARNING: HADOOP_NAMENODE_OPTS has been replaced by HDFS_NAMENODE_OPTS. Using value of HADOOP_NAMENODE_OPTS.
Running in non-interactive mode, and data appears to exist in Storage Directory /dfs/nn. Not formatting.

[#3 · Accepted solution]

@rjotwani-211490215,

The error message regarding the supervisor_status file can be ignored.  We will fix the code that generates that error sometime in the future.

The message that indicates the cause of the formatting failure is:

Running in non-interactive mode, and data appears to exist in Storage Directory /dfs/nn.
 Not formatting.

It may be you have some old data in /dfs/nn.  If you are sure you do not need what is in /dfs/nn you can copy it to another location or delete it.  Just be sure you don't need/want whatever is there.

[#4]

thanks