I need to restart an Amazon EMR service, such as YARN ResourceManager.
Short description
The process for restarting a service differs depending on which Amazon EMR release version you're using:
- Amazon EMR 5.30.0 and later release versions: Use the sudo systemctl stop and sudo systemctl start commands.
- Amazon EMR 4.x-5.29.0 release versions: Use the sudo stop and sudo start commands.
- Amazon EMR 2.x-3.x release versions: Use the sudo restart command.
Resolution
Amazon EMR 5.30.0 and later release versions
1. Connect to the master node using SSH.
2. List all running services:
systemctl --type=service
3. To list a specific service, run a command similar to the following. For example, to list the Zeppelin service:
systemctl --type=service | grep -i zeppelin
Example output:
zeppelin.service loaded active running Zeppelin
4. To see a detailed status report for a specific service:
sudo systemctl status zeppelin
Example output:
zeppelin.service - Zeppelin
Loaded: loaded (/etc/systemd/system/zeppelin.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2020-04-21 18:26:53 UTC; 4min 59s ago
Process: 25719 ExecStart=/usr/bin/su -s /bin/bash zeppelin -c cd /var/lib/zeppelin && /usr/lib/zeppelin/bin/zeppelin-daemon.sh --config '/etc/zeppelin/conf' start (code=exited, status=0/SUCCESS)
Main PID: 25749 (java)
Tasks: 0
Memory: 4.0K
CGroup: /system.slice/zeppelin.service
25749 /etc/alternatives/jre/bin/java -Dfile.encoding=UTF-8 -Xms1024m -Xmx1024m -XX:MaxPermSize=512m -Dlog4j.configuration=file:///etc/zeppelin/con...
5. Stop the service:
Note: You must use the stop and start commands in the following steps. Don't use the restart command.
sudo systemctl stop zeppelin
6. Verify that the service is stopped:
sudo systemctl status zeppelin
7. Start the service:
sudo systemctl start zeppelin
8. Verify that the service is running:
sudo systemctl status zeppelin
Amazon EMR 4.x-5.29.0 release versions
1. Connect to the master node using SSH.
2. List all running services:
initctl list
3. Run the following command to stop the service. Replace "hadoop-yarn-resourcemanager" with the service that you want to restart.
Note: You must use the stop and start commands in the following steps. Don't use the restart command.
sudo stop hadoop-yarn-resourcemanager
4. Wait a few seconds, and then start the service:
sudo start hadoop-yarn-resourcemanager
5. Verify that the process is running:
sudo status hadoop-yarn-resourcemanager
Amazon EMR 2.x-3.x release versions
1. Connect to the master node using SSH.
2. List all running services:
ls /etc/init.d/
3. Run the following command to restart the service. Replace "hadoop-hdfs-namenode" with the service that you want to restart.
sudo /etc/init.d/hadoop-hdfs-namenode restart
4. Verify that the process is running:
sudo /etc/init.d/hadoop-hdfs-namenode status
Related information
About Amazon EMR releases