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# Install additional software on your Amazon EMR cluster
<a name="emrcluster-example-install-software"></a>

**Example**  <a name="example2"></a>
`EmrCluster` provides the `supportedProducts` field that installs third-party software on an Amazon EMR cluster, for example, it lets you install a custom distribution of Hadoop, such as MapR. It accepts a comma-separated list of arguments for the third-party software to read and act on. The following example shows how to use the `supportedProducts` field of `EmrCluster` to create a custom MapR M3 edition cluster with Karmasphere Analytics installed, and run an `EmrActivity` object on it.  

```
{
    "id": "MyEmrActivity",
    "type": "EmrActivity",
    "schedule": {"ref": "ResourcePeriod"},
    "runsOn": {"ref": "MyEmrCluster"},
    "postStepCommand": "echo Ending job >> /mnt/var/log/stepCommand.txt",    
    "preStepCommand": "echo Starting job > /mnt/var/log/stepCommand.txt",
    "step": "/home/hadoop/contrib/streaming/hadoop-streaming.jar,-input,s3n://elasticmapreduce/samples/wordcount/input,-output, \
     hdfs:///output32113/,-mapper,s3n://elasticmapreduce/samples/wordcount/wordSplitter.py,-reducer,aggregate"
  },
  {    
    "id": "MyEmrCluster",
    "type": "EmrCluster",
    "schedule": {"ref": "ResourcePeriod"},
    "supportedProducts": ["mapr,--edition,m3,--version,1.2,--key1,value1","karmasphere-enterprise-utility"],
    "masterInstanceType": "m3.xlarge",
    "taskInstanceType": "m3.xlarge"
}
```