Help Center/ MapReduce Service/ User Guide (Kuala Lumpur Region)/ Troubleshooting/ Cluster Management/ High Memory Usage of the Knox Process
Updated on 2022-12-14 GMT+08:00
View PDF
Share

High Memory Usage of the Knox Process

Issue

The memory usage of the knox process is high.

Symptom

The memory usage of the active Master node is high. The top -c command output shows that the memory usage of the knox process exceeds 4 GB.

Cause Analysis

The memory is not separately configured for the knox process. The process automatically allocates available memory based on the system memory size. As a result, the knox process occupies a large amount of memory.

Procedure

  1. Log in to the Master nodes as user root.
  2. Open the /opt/knox/bin/gateway.sh file. Search for APP_MEM_OPTS, and set its value to -Xms3072m -Xmx4096m.
  3. Log in to Manager and click Hosts. Find the IP address of the active Master node (that is, the node with a solid star before the hostname), and log in to the background of the node.
  4. Run the following commands to restart the process:

    su - omm

    sh /opt/knox/bin/restart-knox.sh

Parent topic: Cluster Management