Where is the configuration file for HDFS in Hadoop 2.2.0?

These files are all found in the hadoop/conf directory.

For setting HDFS you have to configure core-site.xml and hdfs-site.xml.

HDFS works in two modes: distributed (multi-node cluster) and pseudo-distributed (cluster of one single machine).

For the pseudo-distributed mode you have to configure:

In core-site.xml:

<!-- namenode --><property>  <name>fs.default.name</name>  <value>hdfs://localhost:8020</value></property>

In hdfs-site.xml:

<-- storage directories for HDFS - the hadoop.tmp.dir property, whose default is /tmp/hadoop-${user.name} --><property>    <name>hadoop.tmp.dir</name>    <value>/your-dir/</value></property>

Each property has its hardcoded default value.

Please remember to set ssh password-less login for hadoop user before starting HDFS.

P.S.

It you download Hadoop from Apache, you can consider switching to a Hadoop distribution:

Cloudera's CDH, HortonWorks or MapR.

If you install Cloudera CDH or Hortonworks HDP you will find the files in /etc/hadoop/conf/.

All the configuration files will be located in the extracted tar.gz file in the etc/hadoop/ directory. The hdfs-site.xml may be hdfs-site.xml.template. You will need to rename it to hdfs-site.xml.

If you want to see what options for hdfs check the doc in the tarball in share/doc/hadoop/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml

For Hortonworks location would be

/etc/hadoop/conf/hdfs-site.xml