Fatal error registering persistent task – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.4-7.15

Briefly, this error occurs when Elasticsearch fails to register a persistent task due to issues like network problems, node failures, or incorrect configurations. To resolve this, you can check the network connectivity between nodes, ensure all nodes are running and properly configured, and verify the task registration process. Additionally, check the Elasticsearch logs for more detailed error information. If the issue persists, consider restarting the Elasticsearch cluster, but ensure data is backed up to prevent any loss.

This guide will help you check for common problems that cause the log ” Fatal error registering persistent task [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: task, persistent.

Log Context

Log “Fatal error registering persistent task [” classname is PersistentTasksNodeService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        AllocatedPersistentTask task;
        try {
            task = (AllocatedPersistentTask) taskManager.register("persistent"; taskInProgress.getTaskName() + "[c]"; request);
        } catch (Exception e) {
            logger.error("Fatal error registering persistent task [" + taskInProgress.getTaskName()
                + "] with id [" + taskInProgress.getId() + "] and allocation id [" + taskInProgress.getAllocationId()
                + "]; removing from persistent tasks"; e);
            notifyMasterOfFailedTask(taskInProgress; e);


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