Impala is included with CDH 5. In a parcel-based configuration, it is part of the CDH parcel rather than a separate parcel. Starting with CDH 5.4 (corresponding to Impala 2.2 in the Impala versioning scheme) new releases of Impala are only available on CDH 5, not CDH 4.
Although these installation instructions primarily focus on CDH 5, you can also manage CDH 4 clusters using Cloudera Manager 5. In CDH 4, Impala has packages and parcels that you download and install separately from CDH. To use Impala with CDH 4, you must install both CDH and Impala on the hosts that will run Impala.
Installing Impala after Upgrading Cloudera Manager
If you have just upgraded Cloudera Manager from a version that did not support Impala, the Impala software is not installed automatically. (Upgrading Cloudera Manager does not automatically upgrade CDH or other managed services). You can add Impala using parcels; go to the Hosts tab, and select the Parcels tab. If you have installed CDH 4, you should see at least one Impala parcel available for download. See Parcels for detailed instructions on using parcels to install or upgrade Impala. If you do not see any Impala parcels available, click the Edit Settings button on the Parcels page to go to the Parcel configuration settings and verify that the Impala parcel repo URL (https://archive.cloudera.com/impala/parcels/latest/) has been configured in the Parcels configuration page. See Parcel Configuration Settings for more details.