2. Modify the Configuration Files

In the temporary directory, locate the following files and modify the properties based on your environment. Search for TODO in the files for the properties to replace. See Define Environment Parameters for more information.

Table 3.1. core-site.xml

Property	Example	Description
fs.default.name	`hdfs://$namenode.full.hostname:8020`	Enter your NameNode hostname
fs.checkpoint.dir	`/grid/hadoop/hdfs/snn`	A comma separated list of paths. Use the list of directories from `$FS_CHECKPOINT_DIR`.

Table 3.2. hdfs-site.xml

Property	Example	Description
dfs.name.dir	`/grid/hadoop/hdfs/nn,/grid1/hadoop/hdfs/nn`	Comma separated list of paths. Use the list of directories from `$DFS_NAME_DIR`
dfs.data.dir	`/grid/hadoop/hdfs/dn,grid1/hadoop/hdfs/dn`	Comma separated list of paths. Use the list of directories from `$DFS_DATA_DIR`
dfs.http.address	`$namenode.full.hostname:50070`	Enter your NameNode hostname for http access
dfs.secondary.http.address	`$secondary.namenode.full.hostname:50090`	Enter your SecondaryNameNode hostname
dfs.https.address	`$namenode.full.hostname:50470`	Enter your NameNode hostname for https access.

Note

	Note
The value of NameNode new generation size should be 1/8 of maximum heap size (`-Xmx`). Please check this value, as the default setting may not be accurate. To change the default value, edit the `/etc/hadoop/conf/hadoop-env.sh` file and change the value of the `-XX:MaxnewSize` parameter to 1/8th the value of the maximum heap size (`-Xmx`) parameter. Also ensure that the NameNode and Secondary NameNode have identical memory settings.

The value of NameNode new generation size should be 1/8 of maximum heap size (-Xmx). Please check this value, as the default setting may not be accurate. To change the default value, edit the /etc/hadoop/conf/hadoop-env.sh file and change the value of the -XX:MaxnewSize parameter to 1/8th the value of the maximum heap size (-Xmx) parameter. Also ensure that the NameNode and Secondary NameNode have identical memory settings.

Table 3.3. mapred-site.xml

Property	Example	Description
mapred.job.tracker	`$jobtracker.full.hostname:50300`	Enter your JobTracker hostname
mapred.job.tracker.http.address	`$jobtracker.full.hostname:50030`	Enter your JobTracker hostname
mapred.local.dir	`/grid/hadoop/mapred,/grid1/hadoop/mapred`	Comma separated list of paths. Use the list of directories from `$MAPREDUCE_LOCAL_DIR`
mapreduce.tasktracker.group	`hadoop`	Enter your group. Use the value of `$HADOOP_GROUP`
mapreduce.history.server.http.address	`$jobtracker.full.hostname:51111`	Enter your JobTracker hostname

Table 3.4. taskcontroller.cfg

Property	Example	Description
mapred.local.dir	`/grid/hadoop/mapred,/grid1/hadoop/mapred`	Comma separated list of paths. Use the list of directories from `$MAPREDUCE_LOCAL_DIR`

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