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Requirements

To deploy Unravel, first ensure that your environment meets these requirements:

Platform

Each version of Unravel has specific platform requirements. Check the compatibility matrix to confirm that your cluster meets the requirements for the version of Unravel that you are installing.

Host
  • Single cluster

    In a single cluster deployment of Unravel, the following requirements should be fulfilled for an independent host:

    • Be managed by Ambari/Cloudera.

    • Must have Hadoop clients pre-installed.

    • Must have no other Hadoop service or third-party applications installed.

    • Accessible to only Hadoop and Unravel Admins.

  • Multi-cluster

    In a multi-cluster deployment of Unravel, the following requirements should be fulfilled for the host on the core node and edge node:

    • Core node

      • Accessible to Unravel Admins.

      • The server should be dedicated only for Unravel. Must have no other Hadoop service or third-party applications installed.

    • Edge node

      • Be managed by Ambari/Cloudera.

      • Must have Hadoop clients pre-installed.

      • Must have no other Hadoop service or third-party applications installed.

      • Accessible to only Hadoop and Unravel Admins.

Software requirements
  • Single cluster

    • All default clients such as YARN, HDFS etc. are running.

    • PATH includes the path to the HDFS+Hive+YARN+Spark client/gateway, Hadoop commands, and Hive commands.

    • Clock synchronization service (such as NTP) is running and in-sync with the cluster.

  • Multi-cluster

    In case of a multi-cluster deployment, confirm the following requirements for core node and edge node respectively:

    • Core node

      • Clock synchronization service (such as NTP) is running and in-sync with the cluster.

    • Edge node

      • All default clients such as YARN, HDFS etc. are running.

      • PATH includes the path to the HDFS+Hive+YARN+Spark client/gateway, Hadoop commands, and Hive commands.

      • Clock synchronization service (such as NTP) is running and in-sync with the cluster.

Permissions
  • Create an Installation directory and grant ownership of the directory to the user who installs Unravel. This user executes all the processes involved in Unravel installation.

  • If you are using Kerberos, you must create a principal and keytab for Unravel daemons to use.

  • Unravel must have read access to these HDFS resources:

    • MapReduce logs (hdfs://user/history)

    • YARN's log aggregation directory (hdfs://tmp/logs)

    • Spark and Spark2 event logs (hdfs://user/spark/applicationHistory and hdfs://user/spark/spark2ApplicationHistory)

    • File and partition sizes in the Hive warehouse directory (typically hdfs://apps/hive/warehouse)

  • Unravel needs access to the YARN Resource Manager's REST API.

  • Unravel needs read-only access to the database used by the Hive metastore.

  • If you plan to use Unravel's move or kill AutoActions, the Unravel username needs to be added to YARN's yarn.admin.acl property.

  • Unravel needs read-only access to the Application Timeline Server (ATS).

  • If you're using Impala, Unravel needs access to the Cloudera Manager API. Read-only access is sufficient.

Network

Note

All the Unravel ports can be customized. Refer to Configuring custom ports.

CDH-specific port requirements

Port(s)

Direction

Description

3000

Both

Traffic to and from Unravel UI

If you plan to use Cloudera Manager to install Unravel's sensors, the Cloudera Manager service must also be able to reach the Unravel host on port 3000.

7180 (or 7183 for HTTPS)

Out

Traffic from Unravel Server(s) to Cloudera Manager

HDFS Ports

For HDFS, access to the NameNode and DataNode should be provided. The default value for NameNode is 8020 and that of DataNode is 9866 and 9867. However, these can be configured to any other ports.

Services

Default port

Direction

Description

NameNode

8020

Both

Traffic to/from the cluster to Unravel servers.

DataNode

9866,9867

Both

Traffic to/from the cluster to Unravel servers.