This topic covers system requirements for standalone clusters including general requirements for Hadoop on YARN and MapR on YARN deployments.
Dremio supports the following Hadoop distributions:
- Apache Hadoop 2.7.2+ and 3+
- Hortonworks HDP 2.6.5 to HDP 3.0.x
- Cloudera CDH 5 and 6
- Cloudera Data Platform 7.1+
- MapR 6.2.0
Dremio 23.0.0+ supports only MapR 6.2.0. If you are running MapR 5.2.x or 6.1.x, you must upgrade to MapR 6.2.0 before upgrading to Dremio 23. Dremio releases up to and including 22.x do not support MapR 6.2.0, only MapR 5.2.x and 6.1.x are supported in releases prior to Dremio 23.JDK: MapR 6.2.0 supports only JDK 11.
Dremio supports the following distributions and versions of Linux:
- RHEL and CentOS 6.7+, 7.3+, and 8.x (RPM and tarball)
- SLES 12 SP2+ (tarball)
- Ubuntu 14.04+ (tarball)
- Debian 7+ (tarball)
Java Development Kit
Dremio requires that Java SE 8 (JDK 1.8) or Java SE 11 (JDK 11) be installed. Supported distributions are OpenJDK and Oracle JDK. Other versions are not currently supported.
Java SE 11 is supported only with Dremio 20.0 and higher and only with certain deployment models. See the Dremio 20.0 Release Notes for more information.
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
The Dremio UI works best with the following browsers:
- Google Chrome 54+
- Apple Safari 11+
- Mozilla Firefox 50+
- Microsoft Edge 14+
Server or Instance Hardware
The following hardware are minimum recommendations based on 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
There should be a low-latency, high-bandwidth network connection between Dremio and the data sources.
The following ports must be open:
|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|
Configuring the Conduit Port
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
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:
For 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:
- In the dremio-env file, modify either the
DREMIO_MAX_HEAP_MEMORY_SIZE_MBproperty. See Configuring Memory for more information.
- Restart the executor node(s).
- In the dremio-env file, modify either the
DREMIO_MAX_DIRECT_MEMORY_SIZE_MB allocation, be sure to leave at least 1-2 GB of memory for the OS.
- To verify the memory assigned to the nodes (heap and direct), run the following query:
SELECT * FROM sys.memory