Edit Mapred site XML file

If you are using MapReduce, edit the mapred-site.xml file to indicate where the job history logs are stored and to allow MapReduce jobs to run across platforms.

Perform the following steps to edit the mapred-site.xml file:

1. Navigate to the *<username>*/.pentaho/metastore/pentaho/NamedCluster/Configs/*<user-defined connection name>* directory and open the mapred-site.xml file.

2. Verify that the mapreduce.jobhistory.address and mapreduce.job.hdfs-servers properties are in the mapred-site.xml file. If they are not in the file, you can add them as follows:

Parameter

Value

mapreduce.jobhistory.address

Set this property to the place where job history logs are stored, as shown in the following example:```xmlmapreduce.jobhistory.address<active node name in the cluster>:10020 </td></tr><tr><td> **mapreduce.job.hdfs-servers** </td><td> Add this property for YARN: ```xml <property> <name>mapreduce.job.hdfs-servers</name> <value>hdfs://*&lt;active node name in the cluster&gt;*:8020</value> </property>

3. Optionally, to allow YARN containers to launch on JDK11.x nodes, add the **mapreduce.jvm.add-opens-as-default** property to the `mapred-site.xml` file, as shown below. All MapReduce jobs require this property to be added in `mapred-site.xml` to run successfully on JDK11.x machines as JAVA 11 does not require **ADD\_OPENS** JVM arguments by default.

**Note:** Do not add this property to containers using JDK17.x nodes.

Parameter	Value
mapreduce.jvm.add-opens-as-default	Add this property for YARN to launch on JDK11.x nodes:```xmlmapreduce.jvm.add-opens-as-default false </td></tr></tbody> </table>4. Save and close the file.