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Version: 2.5

Check environment configurations

This topic lists all environment and system configuration items that you must check and set before deploying StarRocks. Setting these configuration items properly allows your StarRocks cluster to work with high availability and performance.

Ports​

StarRocks uses specific ports for different services. Check whether these ports are occupied on each instance if you have deployed other services on these instances.

FE ports​

On the instances used for the FE deployment, you need to check the following ports:

  • 8030: FE HTTP server port (http_port)
  • 9020: FE Thrift server port (rpc_port)
  • 9030: FE MySQL server port (query_port)
  • 9010: FE internal communication port (edit_log_port)

Run the following commands on the FE instances to check whether these ports are occupied:

netstat -tunlp | grep 8030
netstat -tunlp | grep 9020
netstat -tunlp | grep 9030
netstat -tunlp | grep 9010

If any of the above ports are occupied, you must find alternatives and specify them later when you deploy FE nodes. For detailed instructions, see Deploy StarRocks - Start the Leader FE node.

BE ports​

On the instances used for the BE deployment, you need to check the following ports:

  • 9060: BE Thrift server port (be_port)
  • 8040: BE HTTP server port (webserver_port)
  • 9050: BE heartbeat service port (heartbeat_service_port)
  • 8060: BE bRPC port (brpc_port)

Run the following commands on the BE instances to check whether these ports are occupied:

netstat -tunlp | grep 9060
netstat -tunlp | grep 8040
netstat -tunlp | grep 9050
netstat -tunlp | grep 8060

If any of the above ports are occupied, you must find alternatives and specify them later when you deploy BE nodes. For detailed instructions, see Deploy StarRocks - Start the BE service.

CN ports​

On the instances used for the CN deployment, you need to check the following ports:

  • 9060: CN Thrift server port (thrift_port)
  • 8040: CN HTTP server port (webserver_port)
  • 9050: CN heartbeat service port (heartbeat_service_port)
  • 8060: CN bRPC port (brpc_port)

Run the following commands on the CN instances to check whether these ports are occupied:

netstat -tunlp | grep 9060
netstat -tunlp | grep 8040
netstat -tunlp | grep 9050
netstat -tunlp | grep 8060

If any of the above ports are occupied, you must find alternatives and specify them later when you deploy CN nodes. For detailed instructions, see Deploy StarRocks - Start the CN service.

Hostnames​

If you want to enable FQDN access for your StarRocks cluster, you must assign a hostname to each instance.

In the file /etc/hosts on each instance, you must specify the IP addresses and corresponding hostnames of all the other instances in the cluster.

CAUTION

All IP addresses in the file /etc/hosts must be unique.

JDK configuration​

StarRocks relies on the environment variable JAVA_HOME to locate the Java dependency on the instance.

Run the following command to check the environment variable JAVA_HOME:

echo $JAVA_HOME

Follow these steps to set JAVA_HOME:

  1. Set JAVA_HOME in the file /etc/profile:

    sudo vi /etc/profile
    # Replace <path_to_JDK> with the path where JDK is installed.
    export JAVA_HOME=<path_to_JDK>
    export PATH=$PATH:$JAVA_HOME/bin

  2. Bring the change into effect:

    source /etc/profile

Run the following command to verify the change:

java -version

CPU scaling governor​

This configuration item is optional. You can skip it if your CPU does not support the scaling governor.

The CPU scaling governor controls the CPU power mode. If your CPU supports it, we recommend you set it to performance for better CPU performance:

echo 'performance' | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

Memory configurations​

Memory Overcommit​

Memory Overcommit allows the operating system to overcommit memory resources to processes. We recommend you enable Memory Overcommit.

# Modify the configuration file.
cat >> /etc/sysctl.conf << EOF
vm.overcommit_memory=1
EOF
# Bring the change into effect.
sysctl -p

Transparent Huge Pages​

Transparent Huge Pages are enabled by default. We recommend you disable this feature because it can interfere with the memory allocator, and thereby lead to a drop in performance.

# Change the configuration temporarily.
echo madvise | sudo tee /sys/kernel/mm/transparent_hugepage/enabled
echo madvise | sudo tee /sys/kernel/mm/transparent_hugepage/defrag
# Change the configuration permanently.
cat >> /etc/rc.d/rc.local << EOF
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo madvise > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo madvise > /sys/kernel/mm/transparent_hugepage/defrag
fi
EOF
chmod +x /etc/rc.d/rc.local

Swap Space​

We recommend you disable Swap Space.

Follow these steps to check and disable Swap Space:

  1. Disable Swap Space.

    swapoff /<path_to_swap_space>
    swapoff -a

  2. Delete the Swap Space information from the configuration file /etc/fstab.

    /<path_to_swap_space> swap swap defaults 0 0

  3. Verify that Swap Space is disabled.

    free -m

Swappiness​

We recommend you disable swappiness to eliminate its impact on performance.

# Modify the configuration file.
cat >> /etc/sysctl.conf << EOF
vm.swappiness=0
EOF
# Bring the change into effect.
sysctl -p

Storage configurations​

We recommend that you choose your suitable scheduler algorithm in accordance with the storage medium you use.

You can run the following command to check the scheduler algorithm that you are using:

cat /sys/block/${disk}/queue/scheduler
# For example, run cat /sys/block/vdb/queue/scheduler

We recommend you use the mq-deadline scheduler for SATA disks and the kyber scheduler algorithm for SSD and NVMe disks.

SATA​

The mq-deadline scheduler algorithm suits SATA disks.

# Change the configuration temporarily.
echo mq-deadline | sudo tee /sys/block/${disk}/queue/scheduler
# Change the configuration permanently.
cat >> /etc/rc.d/rc.local << EOF
echo mq-deadline | sudo tee /sys/block/${disk}/queue/scheduler
EOF
chmod +x /etc/rc.d/rc.local

SSD and NVMe​

  • If your NVMe or SSD disks support the kyber scheduler algorithm:

    # Change the configuration temporarily.
    echo kyber | sudo tee /sys/block/${disk}/queue/scheduler
    # Change the configuration permanently.
    cat >> /etc/rc.d/rc.local << EOF
    echo kyber | sudo tee /sys/block/${disk}/queue/scheduler
    EOF
    chmod +x /etc/rc.d/rc.local

  • If your NVMe or SSD disks support the none (or noop) scheduler.

    # Change the configuration temporarily.
    echo none | sudo tee /sys/block/vdb/queue/scheduler
    # Change the configuration permanently.
    cat >> /etc/rc.d/rc.local << EOF
    echo none | sudo tee /sys/block/${disk}/queue/scheduler
    EOF
    chmod +x /etc/rc.d/rc.local

SELinux​

We recommend you disable SELinux.

# Change the configuration temporarily.
setenforce 0
# Change the configuration permanently.
sed -i 's/SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
sed -i 's/SELINUXTYPE/#SELINUXTYPE/' /etc/selinux/config

Firewall​

Open the internal ports for FE nodes, BE nodes, and Broker if your firewall is enabled.

systemctl stop firewalld.service
systemctl disable firewalld.service

LANG variable​

Run the following command to check and configure the LANG variable manually:

# Modify the configuration file.
echo "export LANG=en_US.UTF8" >> /etc/profile
# Bring the change into effect.
source /etc/profile

Time zone​

Set this item in accordance with your actual time zone.

The following example sets the time zone to /Asia/Shanghai.

cp -f /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
hwclock

ulimit configurations​

Problems can occur with StarRocks if the values of max file descriptors and max user processes are abnormally small. We recommend you enlarge these values.

cat >> /etc/security/limits.conf << EOF
* soft nproc 65535
* hard nproc 65535
* soft nofile 655350
* hard nofile 655350
* soft stack unlimited
* hard stack unlimited
* hard memlock unlimited
* soft memlock unlimited
EOF

cat >> /etc/security/limits.d/20-nproc.conf << EOF 
*          soft    nproc     65535
root       soft    nproc     65535
EOF

File system configuration​

We recommend you use the ext4 or xfs journaling file system. You can run the following command to check the mount type:

df -Th

Network configuration​

tcp_abort_on_overflow​

Allow the system to reset new connections if the system is currently overflowed with new connection attempts that the daemon(s) can not handle:

# Modify the configuration file.
cat >> /etc/sysctl.conf << EOF
net.ipv4.tcp_abort_on_overflow=1
EOF
# Bring the change into effect.
sysctl -p

somaxconn​

Specify the maximum number of connection requests queued for any listening socket to 1024:

# Modify the configuration file.
cat >> /etc/sysctl.conf << EOF
net.core.somaxconn=1024
EOF
# Bring the change into effect.
sysctl -p

NTP configuration​

You must configure time synchronization between nodes within your StarRocks cluster to ensure linear consistency of transactions. You can either use the internet time service provided by pool.ntp.org, or use the NTP service built in an offline environment. For example, you can use the NTP service provided by your cloud service provider.

  1. Check if the NTP time server or Chrony service exists.

    rpm -qa | grep ntp
    systemctl status chrony

  2. Install the NTP service if there is not one.

    sudo yum install ntp ntpdate && \
    sudo systemctl start ntpd.service && \
    sudo systemctl enable ntpd.service

  3. Check the NTP service.

    systemctl list-unit-files | grep ntp

  4. Check the connectivity and monitoring status of the NTP service.

    netstat -tlunp | grep ntp

  5. Check if your application is synchronized with the NTP server.

    ntpstat

  6. Check the state of all the configured NTP servers in your network.

    ntpq -p

High concurrency configurations​

If your StarRocks cluster has a high load concurrency, we recommend you set the following configurations.

max_map_count​

Specify the maximum number of memory map areas a process may have as 262144:

# Modify the configuration file.
cat >> /etc/sysctl.conf << EOF
vm.max_map_count = 262144
EOF
# Bring the change into effect.
sysctl -p

Other​

echo 120000 > /proc/sys/kernel/threads-max
echo 200000 > /proc/sys/kernel/pid_max