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Published Sep. 10, 2025

MEMORY_CLUSTERED jobs are running in several nodes

Written By

Mariano Alvaro

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Issue

  • According to traces, or any other monitoring system, MEMORY_CLUSTERED jobs are executed in more than one node.

Environment

  • Liferay DXP 7.0, 7.1, 7.2

Resolution

  • MEMORY_CLUSTERED jobs should only run in master node.
  • Ensure that there's only one master node across the cluster executing the following script on every node: 
    import com.liferay.portal.kernel.cluster.*;

out.println("** Master: "+ ClusterMasterExecutorUtil.isMaster());
  • Only one node per cluster should print: ** Master: true
  • If it happens occasionally one of the followings could be the cause:
    • Network problems: If the network is slow or it's loosing some packages the cluster could end in a broken status.
    • CPU saturation:If too high, the node would not be able to answer on time to JGroups heartbeat messages, appearing as departed from the cluster.
  •  If the cluster has never been in a healthy status review the cluster configuration, visibility among nodes (firewall, nodes must use the same network interface,...): Liferay Portal Clustering
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