ERROR: Cannot set priority of journalnode process 6520 - docker

Question

I have three physical nodes with docker installed on them. I have configured a high available hadoop cluster among these nodes. The configuration is like this:
Core-site.xml:
<property>
<name>fs.defaultFS</name>
<value>hdfs://mycluster</value>
</property>
<property>
<name>dfs.journalnode.edits.dir</name>
<value>/tmp/hadoop/dfs/jn</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://mycluster</value>
</property>
<property>
<name>ha.zookeeper.quorum</name>
<value>10.32.0.1:2181,10.32.0.2:2181,10.32.0.3:2181</value>
</property>
Hdfs-site.xml:
<property>
<name>dfs.nameservices</name>
<value>mycluster</value>
</property>
<property>
<name>dfs.ha.namenodes.mycluster</name>
<value>nn1,nn2</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.nn1</name>
<value>10.32.0.1:8020</value>
</property>
<property>
<name>dfs.namenode.rpc-address.mycluster.nn2</name>
<value>10.32.0.2:8020</value>
</property>
<property>
<name>dfs.namenode.http-address.mycluster.nn1</name>
<value>10.32.0.1:50070</value>
</property>
<property>
<name>dfs.namenode.http-address.mycluster.nn2</name>
<value>10.32.0.2:50070</value>
</property>
<property>
<name>dfs.client.failover.proxy.provider.mycluster</name>
<value>org.apache.hadoop.hdfs.server.namenode.
ha.ConfiguredFailoverProxyProvider</value>
</property>
<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>qjournal://
10.32.0.1:8485;10.32.0.2:8485;10.32.0.3:8485/mycluster</value>
</property>
<property>
<name>dfs.permissions.enable</name>
<value> false </value>
</property>
<property>
<name>dfs.ha.fencing.methods</name>
<value>sshfence</value>
</property>
<property>
<name>dfs.ha.fencing.ssh.private-key-files</name>
<value>/home/hdfs/.ssh/id_rsa</value>
</property>
<property>
<name>dfs.ha.fencing.ssh.connect-timeout</name>
<value>30000</value>
</property>
<property>
<name>dfs.permissions.superusergroup</name>
<value>hdfs</value>
</property>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:///usr/local/hadoop_store/hdfs/namenode</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:///usr/local/hadoop_store/hdfs/datanode</value>
</property>
<property>
<name>dfs.namenode.datanode.registration.ip-hostname-
check</name>
<value>false</value>
</property>
<property>
<name>dfs.ha.automatic-failover.enabled</name>
<value>true</value>
</property>
I made hdfs user and ssh-passwordless. When I want to start journalnode to format namenode via this command:
sudo /opt/hadoop/bin/hdfs --daemon start journalnode
I receive this error:
ERROR: Cannot set priority of journalnode process 6520
Would you please what is wrong with my configuration to receive the error?
Thank you in advance.

Answer 1

Problem solved. I check the log in /opt/hadoop/logs/*.log and see this line:
Cannot make directory of /tmp/hadoop/dfs/journalnode.
First, I put configuration of journal node directory to hdfs-site.xml and made a journal node directory. Then I started journal node again and I faced with this error:
directory is not writable. So, I ran these commands to make the directory writable:
chmod 777 /tmp/hadoop/dfs/journalnode
chown -R root /tmp/hadoop/dfs/journalnode
Then I could start journal node.