From Cloudera Base on premisesPDF version

Step 1: Getting Started Upgrading a Cluster

Tasks you should perform before starting the upgrade.

My Environment

Fill in the following form to create a customized set of instructions for your environment.

Fill out the form above before you proceed.

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7.13.1 7.11.3 7.7.3 7.7.1 7.6.7 7.6.1 7.4.4 7.3.1 7.1.9.1000 7.1.9 7.1.8 7.1.7.3000 7.1.7.2000 7.1.7.1000 7.1.7 7.1.6 7.3.1 7.1.9.1000 7.1.9 7.1.8 7.1.7.3000 7.1.7.2000 7.1.7.1000 7.1.7

The version of CDH or that you can upgrade to depends on the version of that is managing the cluster. You may need to upgrade before upgrading your clusters. Upgrades are not supported when using 7.0.3.

Before you upgrade a cluster,
  • You need to gather information, review the limitations and release notes and run some checks on the cluster. See the Collect Information section below. Fill in the My Environment form below to customize your upgrade procedures.
  • You must clean all the HBase Master procedure stores. For more details, see Clean the HBase Master procedure store.

Minimum Required Role: Cluster Administrator (also provided by Full Administrator)

Collect the following information about your environment and fill in the form above. This information will be remembered by your browser on all pages in this Upgrade Guide.

  1. Log in to the Server host. 
    ssh my_cloudera_manager_server_host
  2. Run the following command to find the current version of the Operating System:
    lsb_release -a
  3. Log in to the Admin console and find the following:
    1. The version of used in your cluster. Go to Support > About.
    2. The version of the JDK deployed in the cluster. Go to Support > About.
    3. Whether High Availability is enabled for HDFS. Go to > Clusters > HDFS

      If you see a standby namenode instead of a secondary namenode listed under > HDFS > Instances, then High Availability is enabled.

    4. The current cluster version (parcels). The cluster version number along with (parcels) are displayed on the Home page, to the right of the cluster name.

  1. You must have SSH access to the server hosts and be able to log in using the root account or an account that has password-less sudo permission to all the hosts.
  2. Review the Requirements and Supported Versions for the new versions you are upgrading to. See: 7.x.x Requirements and Supported Versions If your hosts require an operating system upgrade, you must perform the upgrade before upgrading the cluster. See Upgrading the Operating System to a new Major Version.
  3. Ensure that a supported version of Java is installed on all hosts in the cluster. See the links above. For installation instructions and recommendations, see Upgrading the JDK.
  4. Review the following documents:
  5. If your deployment has defined a Compute cluster and an associated Data Context, you will need to delete the Compute cluster and Data context before upgrading the base cluster and then recreate the Compute cluster and Data context after the upgrade.

    See Starting, Stopping, Refreshing, and Restarting a Cluster and Virtual Private Clusters and Cloudera SDX.

  6. Review the upgrade procedure and reserve a maintenance window with enough time allotted to perform all steps. For production clusters, recommends allocating up to a full day maintenance window to perform the upgrade, depending on the number of hosts, the amount of experience you have with Hadoop and Linux, and the particular hardware you are using.
  7. If the cluster uses Impala, check your SQL against the newest reserved words listed in incompatible changes. If upgrading across multiple versions, or in case of any problems, check against the full list of Impala reserved words.
  8. If the cluster uses Hive, validate the Hive Metastore Schema:
    1. In the Admin Console, Go to the Hive service.
    2. Select Actions > Validate Hive Metastore Schema.
    3. Fix any reported errors.
    4. Select Actions > Validate Hive Metastore Schema again to ensure that the schema is now valid.
  9. Run the Security Inspector and fix any reported errors.

    Go to Administration > Security > Security Inspector.

  10. Log in to any cluster node as the hdfs user, run the following commands, and correct any reported errors: 
    hdfs fsck / -includeSnapshots -showprogress

    hdfs dfsadmin -report
    See HDFS Commands Guide in the Apache Hadoop documentation.
  11. Log in to any DataNode as the hbase user, run the following command, and correct any reported errors: 
    hbase hbck
  12. If the cluster uses Kudu, log in to any cluster host and run the ksck command as the kudu user (sudo -u kudu). If the cluster is Kerberized, first kinit as kudu then run the command: 
    kudu cluster ksck <master_addresses>

    For the full syntax of this command, see Checking Cluster Health with ksck.

  13. If your cluster uses Impala and Llama, this role has been deprecated as of CDH 5.9 and you must remove the role from the Impala service before starting the upgrade. If you do not remove this role, the upgrade wizard will halt the upgrade.
    To determine if Impala uses Llama:
    1. Go to the Impala service.
    2. Select the Instances tab.
    3. Examine the list of roles in the Role Type column. If Llama appears, the Impala service is using Llama.
    To remove the Llama role:
    1. Go to the Impala service and select Actions > Disable YARN and Impala Integrated Resource Management.

      The Disable YARN and Impala Integrated Resource Management wizard displays.

    2. Click Continue.

      The Disable YARN and Impala Integrated Resource Management Command page displays the progress of the commands to disable the role.

    3. When the commands have completed, click Finish.
  14. If your cluster uses the Ozone technical preview, you must stop and delete this service before upgrading the cluster.
  15. If your cluster uses Kafka, you must explicitly set the Kafka protocol version to match what's being used currently among the brokers and clients. Update kafka.properties on all brokers as follows:
    1. Log in to the Admin Console.
    2. Choose the Kafka service.
    3. Click Configuration.
    4. Use the Search field to find the Kafka Broker Advanced Configuration Snippet (Safety Valve) for kafka.properties configuration property.
    5. Add the following properties to the snippet:
      • inter.broker.protocol.version = [***CURRENT KAFKA VERSION***]
      • log.message.format.version = [***CURRENT KAFKA VERSION***]
      Replace [***CURRENT KAFKA VERSION***] with the version of Apache Kafka currently being used. See component versions for the Apache Kafka versions shipped with . Make sure you enter full Apache Kafka version numbers with three values, such as 0.10.0. Otherwise, you will see an error message similar to the following:
      2018-06-14 14:25:47,818 FATAL kafka.Kafka$:
java.lang.IllegalArgumentException: Version `0.10` is not a valid version
        at kafka.api.ApiVersion$$anonfun$apply$1.apply(ApiVersion.scala:72)
        at kafka.api.ApiVersion$$anonfun$apply$1.apply(ApiVersion.scala:72)
        at scala.collection.MapLike$class.getOrElse(MapLike.scala:128)
  16. If your cluster uses Streams Replication Manager and you configured the Log Format property, you must take note of your configuration. The value set for Log Format is cleared during the upgrade and must be manually reconfigured following the upgrade.
  17. If your cluster uses Streams Replication Manager and you are affected by OPSAPS-62546, ensure that you apply the workaround detailed in the Known issue. If the workaround is not applied, you might run into issues after the upgrade. For more information, see the SRM Known Issues.
  18. If your cluster uses Streams Replication Manager, export or migrate aggregated metrics.

    In 7.1.9, major changes are made to the internal Kafka Streams application of SRM. As a result, SRM by default loses all aggregated metrics that were collected before the upgrade. This means that you will not be able to query metrics with the SRM Service REST API that describe the pre-upgrade state of replications. If you want to retain the metrics, you can either export them, for archival purposes, or migrate them to the new format used by SRM. If you do not need to retain metrics, you can skip this step and continue with the upgrade.

    Exporting metrics creates a backup of the metric data, however, exported metrics cannot be imported into the SRM Service for consumption. As a result, exporting metrics is only useful for data archival purposes.

    Migrating metrics can be done in two different ways depending on whether you are doing a rolling upgrade or a non-rolling upgrade.

    • In case of a non-rolling upgrade, migration happens following the upgrade. In this case, the new version of the internal Kafka Streams application running in the upgraded cluster starts to process historical metrics as soon as it is online. However, until the metrics are processed, the SRM Service cannot serve requests regarding latest metrics and returns empty or missing responses on its REST API. The duration of this downtime depends on the number SRM Service instances and the amount of metrics in the cluster.

    • In case of a rolling upgrade, a migration process called SRM Service Migrator is initiated during the upgrade. The Migrator processes existing metrics so that they become compatible with your upgraded cluster. Depending on the size of your cluster and the amount of metrics you have, this process may take up to multiple hours to finish.

    Use the following endpoints of the SRM Service REST API to export metrics.
    If upgrading from 7.1.8:
    • /v2/topic-metrics/{source}/{target}/{upstreamTopic}/{metric}
    • /v2/cluster-metrics/{source}/{target}/{metric}
    If upgrading from 7.1.7 or lower:
    • /topic-metrics/{topic}/{metric}
    • /cluster-metrics/{cluster}/{metric}

    For more information regarding the SRM Service REST API, see Streams Replication Manager Service REST API or Streams Replication Manager REST API Reference.

  19. If your cluster uses Cruise Control and you have customized the goals in Cruise Control, ensure that you have created a copy from the values of the following goals before upgrading your cluster:
    • Default goals
    • Supported goals
    • Hard goals
    • Self-healing goals
    • Anomaly detection goals
    For more information, see the Cruise Control Known Issues.
  20. The following services are no longer supported as of CDP Private Cloud Base:
    • Accumulo
    • Sqoop 2
    • MapReduce 1
    • Record Service

    You must stop and delete these services before upgrading a cluster.

  21. Open the Admin console and collect the following information about your environment:
    1. The version of . Go to Support > About.
    2. The version of the JDK deployed. Go to Support > About.
    3. The version of CDH or and whether the cluster was installed using parcels or packages. It is displayed next to the cluster name on the Home page.
    4. The services enabled in your cluster.

      Go to Clusters > Cluster name.

  22. Back up before beginning the upgrade. Before upgrading a cluster, you should backup again, see Step 4: Back Up.