FAQ
For reference, my hdfs-site.xml is:

configuration>
<property>
<name>dfs.datanode.data.dir.perm</name>
<value>755</value>
</property>
<property>
<name>dfs.block.local-path-access.user</name>
<value>impala</value>
</property>
<!-- enable data locality tracking -->
<property>
<name>dfs.datanode.hdfs-blocks-metadata.enabled</name>
<value>true</value>
</property>
<property>
<name>dfs.block.size</name>
<value>134217728</value>
</property>
<property>
<name>dfs.datanode.du.reserved</name>
<value>1073741824</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>/data0/hadoop/hdfs/data,/data1/hadoop/hdfs/data</value>
</property>
<property>
<name>dfs.name.dir</name>
<value>/data0/hadoop/hdfs/name,/data1/hadoop/hdfs/name</value>
</property>
<property>
<name>fs.checkpoint.dir</name>
<value>/data0/hadoop/hdfs/secondary,/data1/hadoop/hdfs/secondary</value>
</property>
</configuration>

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