This topic covers system requirements for standalone clusters including general requirements for Hadoop on YARN and MapR on YARN deployments.
Dremio 4.3+ supports the following Hadoop distributions:
Dremio supports the following distributions and versions of Linux:
Dremio requires that Java SE 8 (also known as JDK 1.8) be installed. Supported distributions are OpenJDK and Oracle JDK. Other versions are currently not supported.
Note The glibc (GNU C Library) implementation of libc is required for OpenJDK. Alpine Linux may use musl, which requires glibc to be installed.
Dremio utilizes the Java compiler (javac) for runtime code generation.
You can check to see if your operating system has Java installed (and which version) with this command:
$ java -version
You can download the latest version of Java SE from the Oracle website.
The Dremio UI works best with the following browsers:
The following hardware are minimum recommendations basedon the Dremio service enabled on the node.
| Dremio Node Role | Hardware Required |
|---|---|
| Master-Coordinator | 8 CPU cores recommended 16GB RAM recommended |
| Executor | 4 CPU core minimum (16 cores recommended) 16GB RAM minimum (128GB recommended) Note: Even if you have a machine with 64GB of RAM, only 16GB is used by default. To change this setting, modify the DREMIO_MAX_DIRECT_MEMORY_SIZE_MB property in the dremio-env file and restart the executor node(s). |
There should be a low-latency, high-bandwidth network connection between Dremio and the data sources.
The following ports must be open:
| Purpose | Port | From | To |
|---|---|---|---|
| UI (HTTPS) | 9047 | Corporate network (end users) | Coordinators |
| Arrow Flight | 32010 | Corporate network (end users) | Coordinators |
| ODBC/JDBC clients (e.g., Tableau, Power BI) | 31010 | Corporate network (end users) | Coordinators |
| ZooKeeper (internal) | 2181 | Other Dremio nodes (coordinators and executors) | Coordinators |
| Inter-node communication | 45678 | Other Dremio nodes | All Dremio nodes |
| Conduit | ephemeral | Coordinators and Executors | Coordinators and Executors |
| Data source reads | Varies | All Dremio nodes | Data source nodes |
Dremio uses an ephemeral network port allocated by the operating system for inter-node communication between coordinators and executors. To assign a static port number to the conduit port, configure services.conduit.port in the Dremio configuration file. If TLS is enabled on your deployment, Dremio applies the same configuration to communications using the conduit port. To use a different configuration or to enable TLS for only the new conduit port, specify all values for services.conduit.ssl in dremio.conf.
Dremio uses Web Sockets. If you encounter the following error message: “Your Internet connection may be offline, or WebSockets to Dremio are being blocked.", ensure that your environment allows WebSocket communication.
A 10 GbE network is recommended when connecting to large data sources that hold terabytes or petabytes of data.
In particular, for maximum performance, it is recommended to use a 10 GbE network between coordinators and executors, executors and executors, and executors and data sources.
To install Dremio, the following access privileges are required:
ssh and scp accessroot or sudo privilegesFor Unix/Linux operating systems, increase your open file limit for users (this impacts the Dremio processes) to 65536.
If you have a machine with a large amount of RAM (for example, 64GB), increase Dremio’s default settings for either the direct memory RAM setting or the HEAP setting. A recommended HEAP value is 8GB.
To increase Dremio’s RAM setting:
DREMIO_MAX_DIRECT_MEMORY_SIZE_MB or DREMIO_MAX_HEAP_MEMORY_SIZE_MB property.
See Configuring Memory for more information.Warning: For the
DREMIO_MAX_DIRECT_MEMORY_SIZE_MBallocation, be sure to leave at least 1-2 GB of memory for the OS.
SELECT * FROM sys.memory