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hadoophdfshadoop2high-availability

Cannot change hdfs datanode directory

The problem is that I can't change datanode directory for hdfs blocks.
If I put this property into hdfs-site.xml I cannot run datanode:

<property>
    <name>dfs.datanode.data.dir</name>
    <value>file:///var/hadoop/datanode</value>
</property>

jps command doesn't show that datanode is running.
Also I tried to use these values but without success:

file:///var/hadoop/datanode
/var/hadoop/datanode
/var/hadoop/datanode/

I have all permitions for this folder:

chmod 777 -R /var/hadoop/datanode

When I remove dfs.datanode.data.dir property from configuration file and run:

hadoop-daemon.sh start datanode

it starts. But I do not know where hadoop stores its blocks.
Please, help me to set a correct data directory for the hdfs.

Solution

  • I do not know why. But when I changed permissions on the datanode it started work.

    chown -R hadoop:hadoop /var/hadoop/datanode