Step 2: Review Notes and Warnings

Notes and warnings to consider before upgrading to CDP.

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Minimum Required Role: Cluster Administrator (also provided by Full Administrator) This feature is not available when using Cloudera Manager to manage Data Hub clusters.

Note the following before upgrading your clusters:

important

The embedded PostgreSQL database is NOT supported in production environments.
The following services are no longer supported as of Enterprise 6.0.0:
- Sqoop 2
- MapReduce 1
- Spark 1.6
- Record Service
Running Apache Accumulo on top of CDP Private Cloud Base 7.1.x cluster is not currently supported. If you try to upgrade to CDP Private Cloud Base 7.1.x, you will be asked to remove the Accumulo service from your cluster.
Upgrading Apache HBase from CDH to Cloudera Runtime 7.1.1 gives you a warning in Cloudera Manager that the Dynamic Jars Directory feature property hbase.dynamic.jars.dir is deprecated. You can ignore this warning when using Apache HBase with HDFS storage on CDP Private Cloud Base. The hbase.dynamic.jars.dir property is incompatible with Apache HBase on cloud deployments using cloud storage.
The minor version of Cloudera Manager you use to perform the upgrade must be equal to or greater than the CDH or Cloudera Runtime minor version. Cloudera recommends that you upgrade to the latest maintenance version of Cloudera Manager before upgrading your cluster. See Supported Upgrade Paths. To upgrade Cloudera Manager, see Upgrading Cloudera Manager 6.
For example:
- Supported:
  - Cloudera Manager 7.1 or higher and Cloudera Runtime 7.0
  - Cloudera Manager 7.1 and CDH 5.
  - Cloudera Manager 6.0.0 and CDH 5.14.0
  - Cloudera Manager 5.14.0 and CDH 5.13.0
  - Cloudera Manager 5.13.1 and CDH 5.13.3
- Not Supported:
  - Cloudera Manager 5.14.0 and CDH 6.0.0
  - Cloudera Manager 5.12 and CDH 5.13
  - Cloudera Manager 6.0.0 and CDH 5.6

note

When upgrading CDH using Rolling Restart (Minor Upgrade only):

Automatic failover does not affect the rolling restart operation.
After the upgrade has completed, do not remove the old parcels if there are MapReduce or Spark jobs currently running. These jobs still use the old parcels and must be restarted in order to use the newly upgraded parcel.
Ensure that Oozie jobs are idempotent.
Do not use Oozie Shell Actions to run Hadoop-related commands.
Rolling upgrade of Spark Streaming jobs is not supported. Restart the streaming job once the upgrade is complete, so that the newly deployed version starts being used.
Runtime libraries must be packaged as part of the Spark application.
You must use the distributed cache to propagate the job configuration files from the client gateway hosts.
Do not build "uber" or "fat" JAR files that contain third-party dependencies or CDH/Cloudera Runtime classes as these can conflict with the classes that Yarn, Oozie, and other services automatically add to the CLASSPATH.
Build your Spark applications without bundling CDH/Cloudera Runtime JARs.