Details
Minor Description
conf-pseudo contains the following in hdfs-site.xml and core-site.xml:
<property>
<!-- specify this so that running 'hadoop namenode -format' formats the right dir -->
<name>dfs.name.dir</name>
<value>/var/lib/hadoop-0.20/cache/hadoop/dfs/name</value>
</property
<property>
<name>hadoop.tmp.dir</name>
<value>/var/lib/hadoop-0.20/cache/${user.name}</value>
</property>
And inherits:
<property>
<name>fs.checkpoint.dir</name>
<value>${hadoop.tmp.dir}/dfs/namesecondary</value>
<description>Determines where on the local filesystem the DFS secondary
name node should store the temporary images to merge.
If this is a comma-delimited list of directories then the image is
replicated in all of the directories for redundancy.
</description>
</property>
What this means, I believe, is that the SNN and the NN come up with fairly different paths:
- /var/lib/hadoop-0.20/cache/hdfs/dfs/namesecondary
- /var/lib/hadoop-0.20/cache/hadoop/dfs/name
They should either both be cache/hdfs or both be cache/hadoop.
Note that I tested this by using the conf.pseudo from the tarballs; I haven't double-checked that the same thing is happening when using the conf-pseudo package.